<feed xmlns='http://www.w3.org/2005/Atom'>
<title>linux-toradex.git/drivers/usb, branch v4.1.20</title>
<subtitle>Linux kernel for Apalis and Colibri modules</subtitle>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/'/>
<entry>
<title>USB: qcserial: add Sierra Wireless EM74xx device ID</title>
<updated>2016-03-09T18:15:24+00:00</updated>
<author>
<name>Bjørn Mork</name>
<email>bjorn@mork.no</email>
</author>
<published>2016-03-01T13:36:32+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=4765409e36975036eeb5a79ca58d0b3da6131101'/>
<id>4765409e36975036eeb5a79ca58d0b3da6131101</id>
<content type='text'>
[ Upstream commit 04fdbc825ffc02fb098964b92de802fff44e73fd ]

The MC74xx and EM74xx modules use different IDs by default, according
to the Lenovo EM7455 driver for Windows.

Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: Bjørn Mork &lt;bjorn@mork.no&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
[ Upstream commit 04fdbc825ffc02fb098964b92de802fff44e73fd ]

The MC74xx and EM74xx modules use different IDs by default, according
to the Lenovo EM7455 driver for Windows.

Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: Bjørn Mork &lt;bjorn@mork.no&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>USB: serial: option: add support for Quectel UC20</title>
<updated>2016-03-09T18:15:22+00:00</updated>
<author>
<name>Yegor Yefremov</name>
<email>yegorslists@googlemail.com</email>
</author>
<published>2016-02-29T15:39:57+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=63e289a204c69536706706e31a6805035029852d'/>
<id>63e289a204c69536706706e31a6805035029852d</id>
<content type='text'>
[ Upstream commit c0992d0f54847d0d1d85c60fcaa054f175ab1ccd ]

Add support for Quectel UC20 and blacklist the QMI interface.

Signed-off-by: Yegor Yefremov &lt;yegorslists@googlemail.com&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
[johan: amend commit message ]
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;

Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
[ Upstream commit c0992d0f54847d0d1d85c60fcaa054f175ab1ccd ]

Add support for Quectel UC20 and blacklist the QMI interface.

Signed-off-by: Yegor Yefremov &lt;yegorslists@googlemail.com&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
[johan: amend commit message ]
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;

Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>USB: serial: option: add support for Telit LE922 PID 0x1045</title>
<updated>2016-03-09T18:15:21+00:00</updated>
<author>
<name>Daniele Palmas</name>
<email>dnlplm@gmail.com</email>
</author>
<published>2016-02-29T14:36:11+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=09757912c869346ec88920263aa37a3a854aa038'/>
<id>09757912c869346ec88920263aa37a3a854aa038</id>
<content type='text'>
[ Upstream commit 5deef5551c77e488922cc4bf4bc76df63be650d0 ]

This patch adds support for 0x1045 PID of Telit LE922.

Signed-off-by: Daniele Palmas &lt;dnlplm@gmail.com&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
[ Upstream commit 5deef5551c77e488922cc4bf4bc76df63be650d0 ]

This patch adds support for 0x1045 PID of Telit LE922.

Signed-off-by: Daniele Palmas &lt;dnlplm@gmail.com&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>USB: cp210x: Add ID for Parrot NMEA GPS Flight Recorder</title>
<updated>2016-03-09T18:15:21+00:00</updated>
<author>
<name>Vittorio Alfieri</name>
<email>vittorio88@gmail.com</email>
</author>
<published>2016-02-28T13:40:24+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=fcc00f16ba5e947136d81d2c8efbccce1c564548'/>
<id>fcc00f16ba5e947136d81d2c8efbccce1c564548</id>
<content type='text'>
[ Upstream commit 3c4c615d70c8cbdc8ba8c79ed702640930652a79 ]

The Parrot NMEA GPS Flight Recorder is a USB composite device
consisting of hub, flash storage, and cp210x usb to serial chip.
It is an accessory to the mass-produced Parrot AR Drone 2.
The device emits standard NMEA messages which make the it compatible
with NMEA compatible software. It was tested using gpsd version 3.11-3
as an NMEA interpreter and using the official Parrot Flight Recorder.

Signed-off-by: Vittorio Alfieri &lt;vittorio88@gmail.com&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
[ Upstream commit 3c4c615d70c8cbdc8ba8c79ed702640930652a79 ]

The Parrot NMEA GPS Flight Recorder is a USB composite device
consisting of hub, flash storage, and cp210x usb to serial chip.
It is an accessory to the mass-produced Parrot AR Drone 2.
The device emits standard NMEA messages which make the it compatible
with NMEA compatible software. It was tested using gpsd version 3.11-3
as an NMEA interpreter and using the official Parrot Flight Recorder.

Signed-off-by: Vittorio Alfieri &lt;vittorio88@gmail.com&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>USB: qcserial: add Dell Wireless 5809e Gobi 4G HSPA+ (rev3)</title>
<updated>2016-03-09T18:15:20+00:00</updated>
<author>
<name>Patrik Halfar</name>
<email>patrik_halfar@halfarit.cz</email>
</author>
<published>2016-02-20T17:49:56+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=369ac9cea85f7eea546ddea7e712672ffeabd5ce'/>
<id>369ac9cea85f7eea546ddea7e712672ffeabd5ce</id>
<content type='text'>
[ Upstream commit 013dd239d6220a4e0dfdf0d45a82c34f1fd73deb ]

New revision of Dell Wireless 5809e Gobi 4G HSPA+ Mobile Broadband Card
has new idProduct.

Bus 002 Device 006: ID 413c:81b3 Dell Computer Corp.
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x413c Dell Computer Corp.
  idProduct          0x81b3
  bcdDevice            0.06
  iManufacturer           1 Sierra Wireless, Incorporated
  iProduct                2 Dell Wireless 5809e Gobi™ 4G HSPA+ Mobile Broadband Card
  iSerial                 3
  bNumConfigurations      2

Signed-off-by: Patrik Halfar &lt;patrik_halfar@halfarit.cz&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
[ Upstream commit 013dd239d6220a4e0dfdf0d45a82c34f1fd73deb ]

New revision of Dell Wireless 5809e Gobi 4G HSPA+ Mobile Broadband Card
has new idProduct.

Bus 002 Device 006: ID 413c:81b3 Dell Computer Corp.
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x413c Dell Computer Corp.
  idProduct          0x81b3
  bcdDevice            0.06
  iManufacturer           1 Sierra Wireless, Incorporated
  iProduct                2 Dell Wireless 5809e Gobi™ 4G HSPA+ Mobile Broadband Card
  iSerial                 3
  bNumConfigurations      2

Signed-off-by: Patrik Halfar &lt;patrik_halfar@halfarit.cz&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>usb: chipidea: otg: change workqueue ci_otg as freezable</title>
<updated>2016-03-07T21:35:41+00:00</updated>
<author>
<name>Peter Chen</name>
<email>peter.chen@nxp.com</email>
</author>
<published>2016-02-24T03:05:25+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=49670184289e48451171179470a7dbbdb63f9549'/>
<id>49670184289e48451171179470a7dbbdb63f9549</id>
<content type='text'>
[ Upstream commit d144dfea8af7108f613139623e63952ed7e69c0c ]

If we use USB ID pin as wakeup source, and there is a USB block
device on this USB OTG (ID) cable, the system will be deadlock
after system resume.

The root cause for this problem is: the workqueue ci_otg may try
to remove hcd before the driver resume has finished, and hcd will
disconnect the device on it, then, it will call device_release_driver,
and holds the device lock "dev-&gt;mutex", but it is never unlocked since
it waits workqueue writeback to run to flush the block information, but
the workqueue writeback is freezable, it is not thawed before driver
resume has finished.

When the driver (device: sd 0:0:0:0:) resume goes to dpm_complete, it
tries to get its device lock "dev-&gt;mutex", but it can't get it forever,
then the deadlock occurs. Below call stacks show the situation.

So, in order to fix this problem, we need to change workqueue ci_otg
as freezable, then the work item in this workqueue will be run after
driver's resume, this workqueue will not be blocked forever like above
case since the workqueue writeback has been thawed too.

Tested at: i.mx6qdl-sabresd and i.mx6sx-sdb.

[  555.178869] kworker/u2:13   D c07de74c     0   826      2 0x00000000
[  555.185310] Workqueue: ci_otg ci_otg_work
[  555.189353] Backtrace:
[  555.191849] [&lt;c07de4fc&gt;] (__schedule) from [&lt;c07dec6c&gt;] (schedule+0x48/0xa0)
[  555.198912]  r10:ee471ba0 r9:00000000 r8:00000000 r7:00000002 r6:ee470000 r5:ee471ba4
[  555.206867]  r4:ee470000
[  555.209453] [&lt;c07dec24&gt;] (schedule) from [&lt;c07e2fc4&gt;] (schedule_timeout+0x15c/0x1e0)
[  555.217212]  r4:7fffffff r3:edc2b000
[  555.220862] [&lt;c07e2e68&gt;] (schedule_timeout) from [&lt;c07df6c8&gt;] (wait_for_common+0x94/0x144)
[  555.229140]  r8:00000000 r7:00000002 r6:ee470000 r5:ee471ba4 r4:7fffffff
[  555.235980] [&lt;c07df634&gt;] (wait_for_common) from [&lt;c07df790&gt;] (wait_for_completion+0x18/0x1c)
[  555.244430]  r10:00000001 r9:c0b5563c r8:c0042e48 r7:ef086000 r6:eea4372c r5:ef131b00
[  555.252383]  r4:00000000
[  555.254970] [&lt;c07df778&gt;] (wait_for_completion) from [&lt;c0043cb8&gt;] (flush_work+0x19c/0x234)
[  555.263177] [&lt;c0043b1c&gt;] (flush_work) from [&lt;c0043fac&gt;] (flush_delayed_work+0x48/0x4c)
[  555.271106]  r8:ed5b5000 r7:c0b38a3c r6:eea439cc r5:eea4372c r4:eea4372c
[  555.277958] [&lt;c0043f64&gt;] (flush_delayed_work) from [&lt;c00eae18&gt;] (bdi_unregister+0x84/0xec)
[  555.286236]  r4:eea43520 r3:20000153
[  555.289885] [&lt;c00ead94&gt;] (bdi_unregister) from [&lt;c02c2154&gt;] (blk_cleanup_queue+0x180/0x29c)
[  555.298250]  r5:eea43808 r4:eea43400
[  555.301909] [&lt;c02c1fd4&gt;] (blk_cleanup_queue) from [&lt;c0417914&gt;] (__scsi_remove_device+0x48/0xb8)
[  555.310623]  r7:00000000 r6:20000153 r5:ededa950 r4:ededa800
[  555.316403] [&lt;c04178cc&gt;] (__scsi_remove_device) from [&lt;c0415e90&gt;] (scsi_forget_host+0x64/0x68)
[  555.325028]  r5:ededa800 r4:ed5b5000
[  555.328689] [&lt;c0415e2c&gt;] (scsi_forget_host) from [&lt;c0409828&gt;] (scsi_remove_host+0x78/0x104)
[  555.337054]  r5:ed5b5068 r4:ed5b5000
[  555.340709] [&lt;c04097b0&gt;] (scsi_remove_host) from [&lt;c04cdfcc&gt;] (usb_stor_disconnect+0x50/0xb4)
[  555.349247]  r6:ed5b56e4 r5:ed5b5818 r4:ed5b5690 r3:00000008
[  555.355025] [&lt;c04cdf7c&gt;] (usb_stor_disconnect) from [&lt;c04b3bc8&gt;] (usb_unbind_interface+0x78/0x25c)
[  555.363997]  r8:c13919b4 r7:edd3c000 r6:edd3c020 r5:ee551c68 r4:ee551c00 r3:c04cdf7c
[  555.371892] [&lt;c04b3b50&gt;] (usb_unbind_interface) from [&lt;c03dc248&gt;] (__device_release_driver+0x8c/0x118)
[  555.381213]  r10:00000001 r9:edd90c00 r8:c13919b4 r7:ee551c68 r6:c0b546e0 r5:c0b5563c
[  555.389167]  r4:edd3c020
[  555.391752] [&lt;c03dc1bc&gt;] (__device_release_driver) from [&lt;c03dc2fc&gt;] (device_release_driver+0x28/0x34)
[  555.401071]  r5:edd3c020 r4:edd3c054
[  555.404721] [&lt;c03dc2d4&gt;] (device_release_driver) from [&lt;c03db304&gt;] (bus_remove_device+0xe0/0x110)
[  555.413607]  r5:edd3c020 r4:ef17f04c
[  555.417253] [&lt;c03db224&gt;] (bus_remove_device) from [&lt;c03d8128&gt;] (device_del+0x114/0x21c)
[  555.425270]  r6:edd3c028 r5:edd3c020 r4:ee551c00 r3:00000000
[  555.431045] [&lt;c03d8014&gt;] (device_del) from [&lt;c04b1560&gt;] (usb_disable_device+0xa4/0x1e8)
[  555.439061]  r8:edd3c000 r7:eded8000 r6:00000000 r5:00000001 r4:ee551c00
[  555.445906] [&lt;c04b14bc&gt;] (usb_disable_device) from [&lt;c04a8e54&gt;] (usb_disconnect+0x74/0x224)
[  555.454271]  r9:edd90c00 r8:ee551000 r7:ee551c68 r6:ee551c9c r5:ee551c00 r4:00000001
[  555.462156] [&lt;c04a8de0&gt;] (usb_disconnect) from [&lt;c04a8fb8&gt;] (usb_disconnect+0x1d8/0x224)
[  555.470259]  r10:00000001 r9:edd90000 r8:ee471e2c r7:ee551468 r6:ee55149c r5:ee551400
[  555.478213]  r4:00000001
[  555.480797] [&lt;c04a8de0&gt;] (usb_disconnect) from [&lt;c04ae5ec&gt;] (usb_remove_hcd+0xa0/0x1ac)
[  555.488813]  r10:00000001 r9:ee471eb0 r8:00000000 r7:ef3d9500 r6:eded810c r5:eded80b0
[  555.496765]  r4:eded8000
[  555.499351] [&lt;c04ae54c&gt;] (usb_remove_hcd) from [&lt;c04d4158&gt;] (host_stop+0x28/0x64)
[  555.506847]  r6:eeb50010 r5:eded8000 r4:eeb51010
[  555.511563] [&lt;c04d4130&gt;] (host_stop) from [&lt;c04d09b8&gt;] (ci_otg_work+0xc4/0x124)
[  555.518885]  r6:00000001 r5:eeb50010 r4:eeb502a0 r3:c04d4130
[  555.524665] [&lt;c04d08f4&gt;] (ci_otg_work) from [&lt;c00454f0&gt;] (process_one_work+0x194/0x420)
[  555.532682]  r6:ef086000 r5:eeb502a0 r4:edc44480
[  555.537393] [&lt;c004535c&gt;] (process_one_work) from [&lt;c00457b0&gt;] (worker_thread+0x34/0x514)
[  555.545496]  r10:edc44480 r9:ef086000 r8:c0b1a100 r7:ef086034 r6:00000088 r5:edc44498
[  555.553450]  r4:ef086000
[  555.556032] [&lt;c004577c&gt;] (worker_thread) from [&lt;c004bab4&gt;] (kthread+0xdc/0xf8)
[  555.563268]  r10:00000000 r9:00000000 r8:00000000 r7:c004577c r6:edc44480 r5:eddc15c0
[  555.571221]  r4:00000000
[  555.573804] [&lt;c004b9d8&gt;] (kthread) from [&lt;c000fef0&gt;] (ret_from_fork+0x14/0x24)
[  555.581040]  r7:00000000 r6:00000000 r5:c004b9d8 r4:eddc15c0

[  553.429383] sh              D c07de74c     0   694    691 0x00000000
[  553.435801] Backtrace:
[  553.438295] [&lt;c07de4fc&gt;] (__schedule) from [&lt;c07dec6c&gt;] (schedule+0x48/0xa0)
[  553.445358]  r10:edd3c054 r9:edd3c078 r8:edddbd50 r7:edcbbc00 r6:c1377c34 r5:60000153
[  553.453313]  r4:eddda000
[  553.455896] [&lt;c07dec24&gt;] (schedule) from [&lt;c07deff8&gt;] (schedule_preempt_disabled+0x10/0x14)
[  553.464261]  r4:edd3c058 r3:0000000a
[  553.467910] [&lt;c07defe8&gt;] (schedule_preempt_disabled) from [&lt;c07e0bbc&gt;] (mutex_lock_nested+0x1a0/0x3e8)
[  553.477254] [&lt;c07e0a1c&gt;] (mutex_lock_nested) from [&lt;c03e927c&gt;] (dpm_complete+0xc0/0x1b0)
[  553.485358]  r10:00561408 r9:edd3c054 r8:c0b4863c r7:edddbd90 r6:c0b485d8 r5:edd3c020
[  553.493313]  r4:edd3c0d0
[  553.495896] [&lt;c03e91bc&gt;] (dpm_complete) from [&lt;c03e9388&gt;] (dpm_resume_end+0x1c/0x20)
[  553.503652]  r9:00000000 r8:c0b1a9d0 r7:c1334ec0 r6:c1334edc r5:00000003 r4:00000010
[  553.511544] [&lt;c03e936c&gt;] (dpm_resume_end) from [&lt;c0079894&gt;] (suspend_devices_and_enter+0x158/0x504)
[  553.520604]  r4:00000000 r3:c1334efc
[  553.524250] [&lt;c007973c&gt;] (suspend_devices_and_enter) from [&lt;c0079e74&gt;] (pm_suspend+0x234/0x2cc)
[  553.532961]  r10:00561408 r9:ed6b7300 r8:00000004 r7:c1334eec r6:00000000 r5:c1334ee8
[  553.540914]  r4:00000003
[  553.543493] [&lt;c0079c40&gt;] (pm_suspend) from [&lt;c0078a6c&gt;] (state_store+0x6c/0xc0)

[  555.703684] 7 locks held by kworker/u2:13/826:
[  555.708140]  #0:  ("%s""ci_otg"){++++.+}, at: [&lt;c0045484&gt;] process_one_work+0x128/0x420
[  555.716277]  #1:  ((&amp;ci-&gt;work)){+.+.+.}, at: [&lt;c0045484&gt;] process_one_work+0x128/0x420
[  555.724317]  #2:  (usb_bus_list_lock){+.+.+.}, at: [&lt;c04ae5e4&gt;] usb_remove_hcd+0x98/0x1ac
[  555.732626]  #3:  (&amp;dev-&gt;mutex){......}, at: [&lt;c04a8e28&gt;] usb_disconnect+0x48/0x224
[  555.740403]  #4:  (&amp;dev-&gt;mutex){......}, at: [&lt;c04a8e28&gt;] usb_disconnect+0x48/0x224
[  555.748179]  #5:  (&amp;dev-&gt;mutex){......}, at: [&lt;c03dc2f4&gt;] device_release_driver+0x20/0x34
[  555.756487]  #6:  (&amp;shost-&gt;scan_mutex){+.+.+.}, at: [&lt;c04097d0&gt;] scsi_remove_host+0x20/0x104

Cc: &lt;stable@vger.kernel.org&gt; #v3.14+
Cc: Jun Li &lt;jun.li@nxp.com&gt;
Signed-off-by: Peter Chen &lt;peter.chen@nxp.com&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
[ Upstream commit d144dfea8af7108f613139623e63952ed7e69c0c ]

If we use USB ID pin as wakeup source, and there is a USB block
device on this USB OTG (ID) cable, the system will be deadlock
after system resume.

The root cause for this problem is: the workqueue ci_otg may try
to remove hcd before the driver resume has finished, and hcd will
disconnect the device on it, then, it will call device_release_driver,
and holds the device lock "dev-&gt;mutex", but it is never unlocked since
it waits workqueue writeback to run to flush the block information, but
the workqueue writeback is freezable, it is not thawed before driver
resume has finished.

When the driver (device: sd 0:0:0:0:) resume goes to dpm_complete, it
tries to get its device lock "dev-&gt;mutex", but it can't get it forever,
then the deadlock occurs. Below call stacks show the situation.

So, in order to fix this problem, we need to change workqueue ci_otg
as freezable, then the work item in this workqueue will be run after
driver's resume, this workqueue will not be blocked forever like above
case since the workqueue writeback has been thawed too.

Tested at: i.mx6qdl-sabresd and i.mx6sx-sdb.

[  555.178869] kworker/u2:13   D c07de74c     0   826      2 0x00000000
[  555.185310] Workqueue: ci_otg ci_otg_work
[  555.189353] Backtrace:
[  555.191849] [&lt;c07de4fc&gt;] (__schedule) from [&lt;c07dec6c&gt;] (schedule+0x48/0xa0)
[  555.198912]  r10:ee471ba0 r9:00000000 r8:00000000 r7:00000002 r6:ee470000 r5:ee471ba4
[  555.206867]  r4:ee470000
[  555.209453] [&lt;c07dec24&gt;] (schedule) from [&lt;c07e2fc4&gt;] (schedule_timeout+0x15c/0x1e0)
[  555.217212]  r4:7fffffff r3:edc2b000
[  555.220862] [&lt;c07e2e68&gt;] (schedule_timeout) from [&lt;c07df6c8&gt;] (wait_for_common+0x94/0x144)
[  555.229140]  r8:00000000 r7:00000002 r6:ee470000 r5:ee471ba4 r4:7fffffff
[  555.235980] [&lt;c07df634&gt;] (wait_for_common) from [&lt;c07df790&gt;] (wait_for_completion+0x18/0x1c)
[  555.244430]  r10:00000001 r9:c0b5563c r8:c0042e48 r7:ef086000 r6:eea4372c r5:ef131b00
[  555.252383]  r4:00000000
[  555.254970] [&lt;c07df778&gt;] (wait_for_completion) from [&lt;c0043cb8&gt;] (flush_work+0x19c/0x234)
[  555.263177] [&lt;c0043b1c&gt;] (flush_work) from [&lt;c0043fac&gt;] (flush_delayed_work+0x48/0x4c)
[  555.271106]  r8:ed5b5000 r7:c0b38a3c r6:eea439cc r5:eea4372c r4:eea4372c
[  555.277958] [&lt;c0043f64&gt;] (flush_delayed_work) from [&lt;c00eae18&gt;] (bdi_unregister+0x84/0xec)
[  555.286236]  r4:eea43520 r3:20000153
[  555.289885] [&lt;c00ead94&gt;] (bdi_unregister) from [&lt;c02c2154&gt;] (blk_cleanup_queue+0x180/0x29c)
[  555.298250]  r5:eea43808 r4:eea43400
[  555.301909] [&lt;c02c1fd4&gt;] (blk_cleanup_queue) from [&lt;c0417914&gt;] (__scsi_remove_device+0x48/0xb8)
[  555.310623]  r7:00000000 r6:20000153 r5:ededa950 r4:ededa800
[  555.316403] [&lt;c04178cc&gt;] (__scsi_remove_device) from [&lt;c0415e90&gt;] (scsi_forget_host+0x64/0x68)
[  555.325028]  r5:ededa800 r4:ed5b5000
[  555.328689] [&lt;c0415e2c&gt;] (scsi_forget_host) from [&lt;c0409828&gt;] (scsi_remove_host+0x78/0x104)
[  555.337054]  r5:ed5b5068 r4:ed5b5000
[  555.340709] [&lt;c04097b0&gt;] (scsi_remove_host) from [&lt;c04cdfcc&gt;] (usb_stor_disconnect+0x50/0xb4)
[  555.349247]  r6:ed5b56e4 r5:ed5b5818 r4:ed5b5690 r3:00000008
[  555.355025] [&lt;c04cdf7c&gt;] (usb_stor_disconnect) from [&lt;c04b3bc8&gt;] (usb_unbind_interface+0x78/0x25c)
[  555.363997]  r8:c13919b4 r7:edd3c000 r6:edd3c020 r5:ee551c68 r4:ee551c00 r3:c04cdf7c
[  555.371892] [&lt;c04b3b50&gt;] (usb_unbind_interface) from [&lt;c03dc248&gt;] (__device_release_driver+0x8c/0x118)
[  555.381213]  r10:00000001 r9:edd90c00 r8:c13919b4 r7:ee551c68 r6:c0b546e0 r5:c0b5563c
[  555.389167]  r4:edd3c020
[  555.391752] [&lt;c03dc1bc&gt;] (__device_release_driver) from [&lt;c03dc2fc&gt;] (device_release_driver+0x28/0x34)
[  555.401071]  r5:edd3c020 r4:edd3c054
[  555.404721] [&lt;c03dc2d4&gt;] (device_release_driver) from [&lt;c03db304&gt;] (bus_remove_device+0xe0/0x110)
[  555.413607]  r5:edd3c020 r4:ef17f04c
[  555.417253] [&lt;c03db224&gt;] (bus_remove_device) from [&lt;c03d8128&gt;] (device_del+0x114/0x21c)
[  555.425270]  r6:edd3c028 r5:edd3c020 r4:ee551c00 r3:00000000
[  555.431045] [&lt;c03d8014&gt;] (device_del) from [&lt;c04b1560&gt;] (usb_disable_device+0xa4/0x1e8)
[  555.439061]  r8:edd3c000 r7:eded8000 r6:00000000 r5:00000001 r4:ee551c00
[  555.445906] [&lt;c04b14bc&gt;] (usb_disable_device) from [&lt;c04a8e54&gt;] (usb_disconnect+0x74/0x224)
[  555.454271]  r9:edd90c00 r8:ee551000 r7:ee551c68 r6:ee551c9c r5:ee551c00 r4:00000001
[  555.462156] [&lt;c04a8de0&gt;] (usb_disconnect) from [&lt;c04a8fb8&gt;] (usb_disconnect+0x1d8/0x224)
[  555.470259]  r10:00000001 r9:edd90000 r8:ee471e2c r7:ee551468 r6:ee55149c r5:ee551400
[  555.478213]  r4:00000001
[  555.480797] [&lt;c04a8de0&gt;] (usb_disconnect) from [&lt;c04ae5ec&gt;] (usb_remove_hcd+0xa0/0x1ac)
[  555.488813]  r10:00000001 r9:ee471eb0 r8:00000000 r7:ef3d9500 r6:eded810c r5:eded80b0
[  555.496765]  r4:eded8000
[  555.499351] [&lt;c04ae54c&gt;] (usb_remove_hcd) from [&lt;c04d4158&gt;] (host_stop+0x28/0x64)
[  555.506847]  r6:eeb50010 r5:eded8000 r4:eeb51010
[  555.511563] [&lt;c04d4130&gt;] (host_stop) from [&lt;c04d09b8&gt;] (ci_otg_work+0xc4/0x124)
[  555.518885]  r6:00000001 r5:eeb50010 r4:eeb502a0 r3:c04d4130
[  555.524665] [&lt;c04d08f4&gt;] (ci_otg_work) from [&lt;c00454f0&gt;] (process_one_work+0x194/0x420)
[  555.532682]  r6:ef086000 r5:eeb502a0 r4:edc44480
[  555.537393] [&lt;c004535c&gt;] (process_one_work) from [&lt;c00457b0&gt;] (worker_thread+0x34/0x514)
[  555.545496]  r10:edc44480 r9:ef086000 r8:c0b1a100 r7:ef086034 r6:00000088 r5:edc44498
[  555.553450]  r4:ef086000
[  555.556032] [&lt;c004577c&gt;] (worker_thread) from [&lt;c004bab4&gt;] (kthread+0xdc/0xf8)
[  555.563268]  r10:00000000 r9:00000000 r8:00000000 r7:c004577c r6:edc44480 r5:eddc15c0
[  555.571221]  r4:00000000
[  555.573804] [&lt;c004b9d8&gt;] (kthread) from [&lt;c000fef0&gt;] (ret_from_fork+0x14/0x24)
[  555.581040]  r7:00000000 r6:00000000 r5:c004b9d8 r4:eddc15c0

[  553.429383] sh              D c07de74c     0   694    691 0x00000000
[  553.435801] Backtrace:
[  553.438295] [&lt;c07de4fc&gt;] (__schedule) from [&lt;c07dec6c&gt;] (schedule+0x48/0xa0)
[  553.445358]  r10:edd3c054 r9:edd3c078 r8:edddbd50 r7:edcbbc00 r6:c1377c34 r5:60000153
[  553.453313]  r4:eddda000
[  553.455896] [&lt;c07dec24&gt;] (schedule) from [&lt;c07deff8&gt;] (schedule_preempt_disabled+0x10/0x14)
[  553.464261]  r4:edd3c058 r3:0000000a
[  553.467910] [&lt;c07defe8&gt;] (schedule_preempt_disabled) from [&lt;c07e0bbc&gt;] (mutex_lock_nested+0x1a0/0x3e8)
[  553.477254] [&lt;c07e0a1c&gt;] (mutex_lock_nested) from [&lt;c03e927c&gt;] (dpm_complete+0xc0/0x1b0)
[  553.485358]  r10:00561408 r9:edd3c054 r8:c0b4863c r7:edddbd90 r6:c0b485d8 r5:edd3c020
[  553.493313]  r4:edd3c0d0
[  553.495896] [&lt;c03e91bc&gt;] (dpm_complete) from [&lt;c03e9388&gt;] (dpm_resume_end+0x1c/0x20)
[  553.503652]  r9:00000000 r8:c0b1a9d0 r7:c1334ec0 r6:c1334edc r5:00000003 r4:00000010
[  553.511544] [&lt;c03e936c&gt;] (dpm_resume_end) from [&lt;c0079894&gt;] (suspend_devices_and_enter+0x158/0x504)
[  553.520604]  r4:00000000 r3:c1334efc
[  553.524250] [&lt;c007973c&gt;] (suspend_devices_and_enter) from [&lt;c0079e74&gt;] (pm_suspend+0x234/0x2cc)
[  553.532961]  r10:00561408 r9:ed6b7300 r8:00000004 r7:c1334eec r6:00000000 r5:c1334ee8
[  553.540914]  r4:00000003
[  553.543493] [&lt;c0079c40&gt;] (pm_suspend) from [&lt;c0078a6c&gt;] (state_store+0x6c/0xc0)

[  555.703684] 7 locks held by kworker/u2:13/826:
[  555.708140]  #0:  ("%s""ci_otg"){++++.+}, at: [&lt;c0045484&gt;] process_one_work+0x128/0x420
[  555.716277]  #1:  ((&amp;ci-&gt;work)){+.+.+.}, at: [&lt;c0045484&gt;] process_one_work+0x128/0x420
[  555.724317]  #2:  (usb_bus_list_lock){+.+.+.}, at: [&lt;c04ae5e4&gt;] usb_remove_hcd+0x98/0x1ac
[  555.732626]  #3:  (&amp;dev-&gt;mutex){......}, at: [&lt;c04a8e28&gt;] usb_disconnect+0x48/0x224
[  555.740403]  #4:  (&amp;dev-&gt;mutex){......}, at: [&lt;c04a8e28&gt;] usb_disconnect+0x48/0x224
[  555.748179]  #5:  (&amp;dev-&gt;mutex){......}, at: [&lt;c03dc2f4&gt;] device_release_driver+0x20/0x34
[  555.756487]  #6:  (&amp;shost-&gt;scan_mutex){+.+.+.}, at: [&lt;c04097d0&gt;] scsi_remove_host+0x20/0x104

Cc: &lt;stable@vger.kernel.org&gt; #v3.14+
Cc: Jun Li &lt;jun.li@nxp.com&gt;
Signed-off-by: Peter Chen &lt;peter.chen@nxp.com&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>USB: option: add "4G LTE usb-modem U901"</title>
<updated>2016-03-07T17:27:38+00:00</updated>
<author>
<name>Bjørn Mork</name>
<email>bjorn@mork.no</email>
</author>
<published>2016-02-12T15:40:00+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=664a608ef37cf8f8bf155d865876314618686756'/>
<id>664a608ef37cf8f8bf155d865876314618686756</id>
<content type='text'>
[ Upstream commit d061c1caa31d4d9792cfe48a2c6b309a0e01ef46 ]

Thomas reports:

T:  Bus=01 Lev=01 Prnt=01 Port=03 Cnt=01 Dev#=  4 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(&gt;ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=05c6 ProdID=6001 Rev=00.00
S:  Manufacturer=USB Modem
S:  Product=USB Modem
S:  SerialNumber=1234567890ABCDEF
C:  #Ifs= 5 Cfg#= 1 Atr=e0 MxPwr=500mA
I:  If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I:  If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I:  If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I:  If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
I:  If#= 4 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage

Cc: &lt;stable@vger.kernel.org&gt;
Reported-by: Thomas Schäfer &lt;tschaefer@t-online.de&gt;
Signed-off-by: Bjørn Mork &lt;bjorn@mork.no&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
[ Upstream commit d061c1caa31d4d9792cfe48a2c6b309a0e01ef46 ]

Thomas reports:

T:  Bus=01 Lev=01 Prnt=01 Port=03 Cnt=01 Dev#=  4 Spd=480 MxCh= 0
D:  Ver= 2.00 Cls=00(&gt;ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=05c6 ProdID=6001 Rev=00.00
S:  Manufacturer=USB Modem
S:  Product=USB Modem
S:  SerialNumber=1234567890ABCDEF
C:  #Ifs= 5 Cfg#= 1 Atr=e0 MxPwr=500mA
I:  If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I:  If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I:  If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I:  If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
I:  If#= 4 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage

Cc: &lt;stable@vger.kernel.org&gt;
Reported-by: Thomas Schäfer &lt;tschaefer@t-online.de&gt;
Signed-off-by: Bjørn Mork &lt;bjorn@mork.no&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>USB: cp210x: add IDs for GE B650V3 and B850V3 boards</title>
<updated>2016-03-07T17:27:33+00:00</updated>
<author>
<name>Ken Lin</name>
<email>ken.lin@advantech.com.tw</email>
</author>
<published>2016-02-01T19:57:25+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=d15706c9c9d206bb2ad9c8a589da380daf1356aa'/>
<id>d15706c9c9d206bb2ad9c8a589da380daf1356aa</id>
<content type='text'>
[ Upstream commit 6627ae19385283b89356a199d7f03c75ba35fb29 ]

Add USB ID for cp2104/5 devices on GE B650v3 and B850v3 boards.

Signed-off-by: Ken Lin &lt;ken.lin@advantech.com.tw&gt;
Signed-off-by: Akshay Bhat &lt;akshay.bhat@timesys.com&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
[ Upstream commit 6627ae19385283b89356a199d7f03c75ba35fb29 ]

Add USB ID for cp2104/5 devices on GE B650v3 and B850v3 boards.

Signed-off-by: Ken Lin &lt;ken.lin@advantech.com.tw&gt;
Signed-off-by: Akshay Bhat &lt;akshay.bhat@timesys.com&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>USB: option: add support for SIM7100E</title>
<updated>2016-03-07T17:27:29+00:00</updated>
<author>
<name>Andrey Skvortsov</name>
<email>andrej.skvortzov@gmail.com</email>
</author>
<published>2016-01-28T21:07:30+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=619400280f304285af5ae99fe674f11ebf9e40cc'/>
<id>619400280f304285af5ae99fe674f11ebf9e40cc</id>
<content type='text'>
[ Upstream commit 3158a8d416f4e1b79dcc867d67cb50013140772c ]

$ lsusb:
Bus 001 Device 101: ID 1e0e:9001 Qualcomm / Option

$ usb-devices:
T:  Bus=01 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#=101 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=00(&gt;ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  2
P:  Vendor=1e0e ProdID=9001 Rev= 2.32
S:  Manufacturer=SimTech, Incorporated
S:  Product=SimTech, Incorporated
S:  SerialNumber=0123456789ABCDEF
C:* #Ifs= 7 Cfg#= 1 Atr=80 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I:* If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
I:* If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
I:* If#= 5 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
I:* If#= 6 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=(none)

The last interface (6) is used for Android Composite ADB interface.

Serial port layout:
0: QCDM/DIAG
1: NMEA
2: AT
3: AT/PPP
4: audio

Signed-off-by: Andrey Skvortsov &lt;andrej.skvortzov@gmail.com&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
[ Upstream commit 3158a8d416f4e1b79dcc867d67cb50013140772c ]

$ lsusb:
Bus 001 Device 101: ID 1e0e:9001 Qualcomm / Option

$ usb-devices:
T:  Bus=01 Lev=02 Prnt=02 Port=00 Cnt=01 Dev#=101 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=00(&gt;ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  2
P:  Vendor=1e0e ProdID=9001 Rev= 2.32
S:  Manufacturer=SimTech, Incorporated
S:  Product=SimTech, Incorporated
S:  SerialNumber=0123456789ABCDEF
C:* #Ifs= 7 Cfg#= 1 Atr=80 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
I:* If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
I:* If#= 4 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
I:* If#= 5 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=ff Prot=ff Driver=qmi_wwan
I:* If#= 6 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=42 Prot=01 Driver=(none)

The last interface (6) is used for Android Composite ADB interface.

Serial port layout:
0: QCDM/DIAG
1: NMEA
2: AT
3: AT/PPP
4: audio

Signed-off-by: Andrey Skvortsov &lt;andrej.skvortzov@gmail.com&gt;
Cc: stable &lt;stable@vger.kernel.org&gt;
Signed-off-by: Johan Hovold &lt;johan@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</pre>
</div>
</content>
</entry>
<entry>
<title>usb: dwc3: Fix assignment of EP transfer resources</title>
<updated>2016-03-07T17:27:19+00:00</updated>
<author>
<name>John Youn</name>
<email>John.Youn@synopsys.com</email>
</author>
<published>2016-02-17T04:10:53+00:00</published>
<link rel='alternate' type='text/html' href='https://git.toradex.cn/cgit/linux-toradex.git/commit/?id=40b43e3cc942d3149c4a6ef4692703ee64e8ba62'/>
<id>40b43e3cc942d3149c4a6ef4692703ee64e8ba62</id>
<content type='text'>
[ Upstream commit c450960187f45d4260db87c7dd4fc0bceb5565d8 ]

The assignement of EP transfer resources was not handled properly in the
dwc3 driver. Commit aebda6187181 ("usb: dwc3: Reset the transfer
resource index on SET_INTERFACE") previously fixed one aspect of this
where resources may be exhausted with multiple calls to SET_INTERFACE.
However, it introduced an issue where composite devices with multiple
interfaces can be assigned the same transfer resources for different
endpoints. This patch solves both issues.

The assignment of transfer resources cannot perfectly follow the data
book due to the fact that the controller driver does not have all
knowledge of the configuration in advance. It is given this information
piecemeal by the composite gadget framework after every
SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook
programming model in this scenario can cause errors. For two reasons:

1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION and
SET_INTERFACE (8.1.5). This is incorrect in the scenario of multiple
interfaces.

2) The databook does not mention doing more DEPXFERCFG for new endpoint
on alt setting (8.1.6).

The following simplified method is used instead:

All hardware endpoints can be assigned a transfer resource and this
setting will stay persistent until either a core reset or hibernation.
So whenever we do a DEPSTARTCFG(0) we can go ahead and do DEPXFERCFG for
every hardware endpoint as well. We are guaranteed that there are as
many transfer resources as endpoints.

This patch triggers off of the calling dwc3_gadget_start_config() for
EP0-out, which always happens first, and which should only happen in one
of the above conditions.

Fixes: aebda6187181 ("usb: dwc3: Reset the transfer resource index on SET_INTERFACE")
Cc: &lt;stable@vger.kernel.org&gt; # v3.2+
Reported-by: Ravi Babu &lt;ravibabu@ti.com&gt;
Signed-off-by: John Youn &lt;johnyoun@synopsys.com&gt;
Signed-off-by: Felipe Balbi &lt;balbi@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</content>
<content type='xhtml'>
<div xmlns='http://www.w3.org/1999/xhtml'>
<pre>
[ Upstream commit c450960187f45d4260db87c7dd4fc0bceb5565d8 ]

The assignement of EP transfer resources was not handled properly in the
dwc3 driver. Commit aebda6187181 ("usb: dwc3: Reset the transfer
resource index on SET_INTERFACE") previously fixed one aspect of this
where resources may be exhausted with multiple calls to SET_INTERFACE.
However, it introduced an issue where composite devices with multiple
interfaces can be assigned the same transfer resources for different
endpoints. This patch solves both issues.

The assignment of transfer resources cannot perfectly follow the data
book due to the fact that the controller driver does not have all
knowledge of the configuration in advance. It is given this information
piecemeal by the composite gadget framework after every
SET_CONFIGURATION and SET_INTERFACE. Trying to follow the databook
programming model in this scenario can cause errors. For two reasons:

1) The databook says to do DEPSTARTCFG for every SET_CONFIGURATION and
SET_INTERFACE (8.1.5). This is incorrect in the scenario of multiple
interfaces.

2) The databook does not mention doing more DEPXFERCFG for new endpoint
on alt setting (8.1.6).

The following simplified method is used instead:

All hardware endpoints can be assigned a transfer resource and this
setting will stay persistent until either a core reset or hibernation.
So whenever we do a DEPSTARTCFG(0) we can go ahead and do DEPXFERCFG for
every hardware endpoint as well. We are guaranteed that there are as
many transfer resources as endpoints.

This patch triggers off of the calling dwc3_gadget_start_config() for
EP0-out, which always happens first, and which should only happen in one
of the above conditions.

Fixes: aebda6187181 ("usb: dwc3: Reset the transfer resource index on SET_INTERFACE")
Cc: &lt;stable@vger.kernel.org&gt; # v3.2+
Reported-by: Ravi Babu &lt;ravibabu@ti.com&gt;
Signed-off-by: John Youn &lt;johnyoun@synopsys.com&gt;
Signed-off-by: Felipe Balbi &lt;balbi@kernel.org&gt;
Signed-off-by: Sasha Levin &lt;sasha.levin@oracle.com&gt;
</pre>
</div>
</content>
</entry>
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