linux-toradex.git, branch v3.13.1

Linux 3.13.1

2014-01-29T13:06:37+00:00

md/raid5: close recently introduced race in stripe_head management.

2014-01-29T13:06:19+00:00

commit 7da9d450ab2843bf1db378c156acc6304dbc1c2b upstream.

As release_stripe and __release_stripe decrement ->count and then
manipulate ->lru both under ->device_lock, it is important that
get_active_stripe() increments ->count and clears ->lru also under
->device_lock.

However we currently list_del_init ->lru under the lock, but increment
the ->count outside the lock.  This can lead to races and list
corruption.

So move the atomic_inc(&sh->count) up inside the ->device_lock
protected region.

Note that we still increment ->count without device lock in the case
where get_free_stripe() was called, and in fact don't take
->device_lock at all in that path.
This is safe because if the stripe_head can be found by
get_free_stripe, then the hash lock assures us the no-one else could
possibly be calling release_stripe() at the same time.

Fixes: 566c09c53455d7c4f1130928ef8071da1a24ea65
Reported-and-tested-by: Ian Kumlien 
Signed-off-by: NeilBrown 
Signed-off-by: Greg Kroah-Hartman

md/raid5: fix long-standing problem with bitmap handling on write failure.

2014-01-29T13:06:18+00:00

commit 9f97e4b128d2ea90a5f5063ea0ee3b0911f4c669 upstream.

Before a write starts we set a bit in the write-intent bitmap.
When the write completes we clear that bit if the write was successful
to all devices.  However if the write wasn't fully successful we
should not clear the bit.  If the faulty drive is subsequently
re-added, the fact that the bit is still set ensure that we will
re-write the data that is missing.

This logic is mediated by the STRIPE_DEGRADED flag - we only clear the
bitmap bit when this flag is not set.
Currently we correctly set the flag if a write starts when some
devices are failed or missing.  But we do *not* set the flag if some
device failed during the write attempt.
This is wrong and can result in clearing the bit inappropriately.

So: set the flag when a write fails.

This bug has been present since bitmaps were introduces, so the fix is
suitable for any -stable kernel.

Reported-by: Ethan Wilson 
Signed-off-by: NeilBrown 
Signed-off-by: Greg Kroah-Hartman

ALSA: hda - Explicitly keep codec powered up in hdmi_present_sense

2014-01-29T13:06:18+00:00

commit da4a7a3926d09c13ae052ede67feb7285e01e3f5 upstream.

This should help us avoid the following mutex deadlock:

[] mutex_lock+0x2a/0x50
[] hdmi_present_sense+0x53/0x3a0 [snd_hda_codec_hdmi]
[] generic_hdmi_resume+0x5a/0x70 [snd_hda_codec_hdmi]
[] hda_call_codec_resume+0xec/0x1d0 [snd_hda_codec]
[] snd_hda_power_save+0x1e4/0x280 [snd_hda_codec]
[] codec_exec_verb+0x5f/0x290 [snd_hda_codec]
[] snd_hda_codec_read+0x5b/0x90 [snd_hda_codec]
[] snd_hdmi_get_eld_size+0x1e/0x20 [snd_hda_codec_hdmi]
[] snd_hdmi_get_eld+0x2c/0xd0 [snd_hda_codec_hdmi]
[] hdmi_present_sense+0x9a/0x3a0 [snd_hda_codec_hdmi]
[] hdmi_repoll_eld+0x34/0x50 [snd_hda_codec_hdmi]

Signed-off-by: David Henningsson 
Fixes: cbbaa603a03c ('ALSA: hda - Fix possible races in HDMI driver')
Signed-off-by: Takashi Iwai 
Signed-off-by: Greg Kroah-Hartman

extcon: gpio: Request gpio pin before modifying its state

2014-01-29T13:06:18+00:00

commit 4288d9b8edcec7289e00eecdad44f14c9ea1ba0e upstream.

Commit 338de0ca (extcon: gpio: Use gpio driver/chip debounce if supported)
introduced a call to gpio_set_debounce() before actually requesting the
respective gpio pin from the gpio subsystem.

The gpio subsystem expects that a gpio pin was requested before modifying its
state. Not doing so results in a warning from gpiolib, and the gpio pin is
auto-requested. This in turn causes the subsequent devm_gpio_request_one()
to fail. So devm_gpio_request_one() must be called prior to calling
gpio_set_debounce().

Signed-off-by: Guenter Roeck 
Acked-by: MyungJoo Ham 
Signed-off-by: Chanwoo Choi 
Signed-off-by: Greg Kroah-Hartman

serial: amba-pl011: use port lock to guard control register access

2014-01-29T13:06:18+00:00

commit fe43390702a1b5741fdf217063b05c7612b38303 upstream.

When the pl011 is being used for a console, pl011_console_write forces
the control register (CR) to enable the UART for transmission and then
restores this to the original value afterwards. It does this while
holding the port lock.

Unfortunately, when the uart is started or shutdown - say in response to
userland using the serial device for a terminal - then this updates the
control register without any locking.

This means we can have

  pl011_console_write   Save CR
  pl011_startup         Initialise CR, e.g. enable receive
  pl011_console_write   Restore old CR with receive not enabled

this result is a serial port which doesn't respond to any input.

A similar race in reverse could happen when the device is shutdown.

We can fix these problems by taking the port lock when updating CR.

Signed-off-by: Jon Medhurst 
Signed-off-by: Greg Kroah-Hartman

mm: Make {,set}page_address() static inline if WANT_PAGE_VIRTUAL

2014-01-29T13:06:18+00:00

commit f92f455f67fef27929e6043499414605b0c94872 upstream.

{,set}page_address() are macros if WANT_PAGE_VIRTUAL.  If
!WANT_PAGE_VIRTUAL, they're plain C functions.

If someone calls them with a void *, this pointer is auto-converted to
struct page * if !WANT_PAGE_VIRTUAL, but causes a build failure on
architectures using WANT_PAGE_VIRTUAL (arc, m68k and sparc64):

  drivers/md/bcache/bset.c: In function `__btree_sort':
  drivers/md/bcache/bset.c:1190: warning: dereferencing `void *' pointer
  drivers/md/bcache/bset.c:1190: error: request for member `virtual' in something not a structure or union

Convert them to static inline functions to fix this.  There are already
plenty of users of struct page members inside , so there's
no reason to keep them as macros.

Signed-off-by: Geert Uytterhoeven 
Acked-by: Michael S. Tsirkin 
Tested-by: Guenter Roeck 
Tested-by: David Rientjes 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

staging: comedi: adl_pci9111: fix incorrect irq passed to request_irq()

2014-01-29T13:06:18+00:00

commit 48108fe3daa0d142f9b97178fdb23704ea3a407b upstream.

The dev->irq passed to request_irq() will always be 0 when the auto_attach
function is called. The pcidev->irq should be used instead to get the correct
irq number.

Signed-off-by: H Hartley Sweeten 
Reviewed-by: Ian Abbott 
Signed-off-by: Greg Kroah-Hartman

staging: comedi: addi_apci_1032: fix subdevice type/flags bug

2014-01-29T13:06:18+00:00

commit 90daf69a7a3f1d1a41018c799968a0bb896d65e0 upstream.

The SDF_CMD_READ should be one of the s->subdev_flags not part of
the s->type.

Signed-off-by: H Hartley Sweeten 
Reviewed-by: Ian Abbott 
Signed-off-by: Greg Kroah-Hartman

staging: comedi: fix result of memdup_user for user chanlist

2014-01-29T13:06:18+00:00

commit e56b1401056288a725d50942ef300dcbed5e519a upstream.

If the channel list is not set in userspace we get an error at
PTR_ERR(async->cmd.chanlist). However, do_become_nonbusy(dev, s) cleans
up this pointer which causes a kernel ooops. Setting the channel list in
async to NULL and checking this in do_become_nonbusy prevents the oops.

[Ian Abbott] Also do the same for the chanlist allocated in
do_cmdtest_ioctl().

Signed-off-by: Bernd Porr 
Signed-off-by: Ian Abbott 
Signed-off-by: Greg Kroah-Hartman