linux-toradex.git, branch toradex_vf_4.1-next Linux kernel for Apalis and Colibri modules tty: serial: fsl_lpuart: lock port on console write 2018-06-04T15:36:25+00:00 Stefan Agner stefan.agner@toradex.com 2017-03-24T19:44:00+00:00 8500b6c5d691ddaba42ac2fa649c5699eaa70d35 The console write code is not entirely race free (e.g. the operations to disabling the UART interrupts are not atomic) hence locking is required. This has been become apparent with the PREEMPT RT patchset applied: With the fully preemptible kernel configuration the system often ended up in a freeze already at startup. Disable interrupts and lock using read_lock_irqsave. Try to lock in the sysrq/oops case, but don't bother if locking fails. Signed-off-by: Stefan Agner <stefan.agner@toradex.com> Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com> 
The console write code is not entirely race free (e.g. the operations
to disabling the UART interrupts are not atomic) hence locking is
required. This has been become apparent with the PREEMPT RT patchset
applied: With the fully preemptible kernel configuration the system
often ended up in a freeze already at startup.

Disable interrupts and lock using read_lock_irqsave. Try to lock in
the sysrq/oops case, but don't bother if locking fails.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
tty: serial: fsl_lpuart: fix del_timer_sync() vs timer routine deadlock 2018-06-04T15:33:34+00:00 Nikita Yushchenko nikita.yoush@cogentembedded.com 2016-12-04T15:49:28+00:00 c40abcef423ca42ebe3d629e131ed5df20632e33 Problem found via lockdep: - lpuart_set_termios() calls del_timer_sync(&sport->lpuart_timer) while holding sport->port.lock - sport->lpuart_timer routine is lpuart_timer_func() that calls lpuart_copy_rx_to_tty() that acquires same lock. To fix, move Rx DMA stopping out of lock, as it already is in other places in the same file. While at it, also make Rx DMA start/stop code to look the same is in other places in the same file. Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com> Tested-by: Stefan Agner <stefan@agner.ch> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> (cherry picked from commit 54a44d54be3a7394ebea42bbffd67819e0f3f89a) 
Problem found via lockdep:

- lpuart_set_termios() calls del_timer_sync(&sport->lpuart_timer) while
  holding sport->port.lock

- sport->lpuart_timer routine is lpuart_timer_func() that calls
  lpuart_copy_rx_to_tty() that acquires same lock.

To fix, move Rx DMA stopping out of lock, as it already is in other places
in the same file.

While at it, also make Rx DMA start/stop code to look the same is in
other places in the same file.

Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Tested-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 54a44d54be3a7394ebea42bbffd67819e0f3f89a)
tty: serial: fsl_lpuart: Fix Tx DMA edge case 2018-05-30T12:07:05+00:00 Aaron Brice aaron.brice@datasoft.com 2016-10-06T22:13:04+00:00 fdd5ac219ee5a69c8c722b4f2162804d59e71cc6 In the case where head == 0 on the circular buffer, there should be one DMA buffer, not two. The second zero-length buffer would break the lpuart driver, transfer would never complete. Signed-off-by: Aaron Brice <aaron.brice@datasoft.com> Signed-off-by: Stefan Agner <stefan.agner@toradex.com> 
In the case where head == 0 on the circular buffer, there should be one
DMA buffer, not two.  The second zero-length buffer would break the
lpuart driver, transfer would never complete.

Signed-off-by: Aaron Brice <aaron.brice@datasoft.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Merge tag 'v4.1.39' into toradex_vf_4.1-next 2017-03-15T17:35:51+00:00 Stefan Agner stefan@agner.ch 2017-03-14T20:59:28+00:00 39ac0033f2345ce7b5d8ca4439192407dacb2355 Linux 4.1.39 
Linux 4.1.39
tty: serial: fsl_lpuart: resync with 4.9 kernel 2017-03-15T17:35:50+00:00 Bhuvanchandra DV bhuvanchandra.dv@toradex.com 2017-02-17T20:25:05+00:00 13f2767f31803754aa883f298737aff866f04628 This commit resyncs the driver changes with 4.9 kernel version of the driver. Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com> Signed-off-by: Stefan Agner <stefan.agner@toradex.com> 
This commit resyncs the driver changes with 4.9 kernel
version of the driver.

Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
ARM: configs: colibri_vf: configure IPv6 SIT driver as module 2017-03-15T17:35:49+00:00 Stefan Agner stefan@agner.ch 2016-11-08T22:38:01+00:00 c7feb3cf69a8b662abb0efbbbfde6f116f39b06b SIT tunnels (IPv6 over IPv4) are not often used hence configure the driver as a module. This also gets rid of the extra network interface sit0 by default. Signed-off-by: Stefan Agner <stefan.agner@toradex.com> Acked-by: Max Krummenacher <max.krummenacher@toradex.com> 
SIT tunnels (IPv6 over IPv4) are not often used hence configure
the driver as a module. This also gets rid of the extra network
interface sit0 by default.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Max Krummenacher <max.krummenacher@toradex.com>
ARM: dts: vf610: Add alias for ethernet controller 2017-03-15T17:35:48+00:00 Stefan Agner stefan@agner.ch 2016-01-30T00:00:13+00:00 e7e358c119601938d724a4fe5377a10c638c5197 Add alias for FEC ethernet on Vybrid to allow bootloaders (like U-Boot) patch-in the MAC address using this alias. Signed-off-by: Stefan Agner <stefan.agner@toradex.com> Acked-by: Max Krummenacher <max.krummenacher@toradex.com> 
Add alias for FEC ethernet on Vybrid to allow bootloaders (like U-Boot)
patch-in the MAC address using this alias.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Max Krummenacher <max.krummenacher@toradex.com>
Merge tag 'v4.1.32' into toradex_vf_4.1-next 2017-03-15T17:35:47+00:00 Stefan Agner stefan@agner.ch 2016-09-16T20:17:38+00:00 6819e8267b359913b95ccc822ac267454f39a460 Linux 4.1.32 
Linux 4.1.32
Merge tag 'v4.1.24' into toradex_vf_4.1-next 2017-03-15T17:35:46+00:00 Stefan Agner stefan@agner.ch 2016-06-02T19:22:30+00:00 440ef98ad687b210dca17e5c5141b24738f04922 Linux 4.1.24 
Linux 4.1.24
tty: serial: fsl_lpuart: enable UART DMA by default 2017-03-15T17:35:45+00:00 Stefan Agner stefan.agner@toradex.com 2016-03-29T19:58:18+00:00 de1c77640710e1cca36091c8e6d7947bff2397e7 The new DMA implementation uses larger buffer sizes and avoids overflows in most situations. Enable DMA by default again. Signed-off-by: Stefan Agner <stefan.agner@toradex.com> Acked-by: Max Krummenacher <max.krummenacher@toradex.com> 
The new DMA implementation uses larger buffer sizes and avoids
overflows in most situations. Enable DMA by default again.

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Max Krummenacher <max.krummenacher@toradex.com>