linux-stable.git/drivers/tty/serial, branch v3.16.57

serial: sh-sci: prevent lockup on full TTY buffers

2018-06-16T21:22:29+00:00

commit 7842055bfce4bf0170d0f61df8b2add8399697be upstream.

When the TTY buffers fill up to the configured maximum, a system lockup
occurs:

[  598.820128] INFO: rcu_preempt detected stalls on CPUs/tasks:
[  598.825796]  0-...!: (1 GPs behind) idle=5a6/2/0 softirq=1974/1974 fqs=1
[  598.832577]  (detected by 3, t=62517 jiffies, g=296, c=295, q=126)
[  598.838755] Task dump for CPU 0:
[  598.841977] swapper/0       R  running task        0     0      0 0x00000022
[  598.849023] Call trace:
[  598.851476]  __switch_to+0x98/0xb0
[  598.854870]            (null)

This can be prevented by doing a dummy read of the RX data register.

This issue affects both HSCIF and SCIF ports. Reported for R-Car H3 ES2.0;
reproduced and fixed on H3 ES1.1. Probably affects other R-Car platforms
as well.

Reported-by: Yoshihiro Shimoda 
Signed-off-by: Ulrich Hecht 
Reviewed-by: Geert Uytterhoeven 
Tested-by: Nguyen Viet Dung 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

serial: 8250_pci: Add Brainboxes UC-260 4 port serial device

2018-06-16T21:22:29+00:00

commit 9f2068f35729948bde84d87a40d135015911345d upstream.

Add PCI ids for two variants of Brainboxes UC-260 quad port
PCI serial cards.

Suggested-by: Andy Shevchenko 
Signed-off-by: Nikola Ciprich 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

tty/serial: atmel: add new version check for usart

2018-06-16T21:22:29+00:00

commit fd63a8903a2c40425a9811c3371dd4d0f42c0ad3 upstream.

On our at91sam9260 based board the usart0 and usart1 ports report
their versions (ATMEL_US_VERSION) as 0x10302. This version is not
included in the current checks in the driver.

Signed-off-by: Jonas Danielsson 
Acked-by: Richard Genoud 
Acked-by: Nicolas Ferre 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

serial: 8250_pci: Add Amazon PCI serial device ID

2018-03-03T15:51:37+00:00

commit 3bfd1300abfe3adb18e84a89d97a0e82a22124bb upstream.

This device will be used in future Amazon EC2 instances as the primary
serial port (i.e., data sent to this port will be available via the
GetConsoleOuput [1] EC2 API).

[1] http://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_GetConsoleOutput.html

Signed-off-by: Matt Wilson 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

serial: samsung: Reorder the sequence of clock control when call s3c24xx_serial_set_termios()

2017-10-12T14:28:17+00:00

commit b8995f527aac143e83d3900ff39357651ea4e0f6 upstream.

This patch fixes the broken serial log when changing the clock source
of uart device. Before disabling the original clock source, this patch
enables the new clock source to protect the clock off state for a split second.

Signed-off-by: Chanwoo Choi 
Reviewed-by: Marek Szyprowski 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

Fix serial console on SNI RM400 machines

2017-10-12T14:27:44+00:00

commit e279e6d98e0cf2c2fe008b3c29042b92f0e17b1d upstream.

sccnxp driver doesn't get the correct uart clock rate, if CONFIG_HAVE_CLOCK
is disabled. Correct usage of clk API to make it work with/without it.

Fixes: 90efa75f7ab0 (serial: sccnxp: Using CLK API for getting UART clock)

Suggested-by: Russell King - ARM Linux 
Signed-off-by: Thomas Bogendoerfer 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

serial: ifx6x60: fix use-after-free on module unload

2017-09-15T17:29:45+00:00

commit 1e948479b3d63e3ac0ecca13cbf4921c7d17c168 upstream.

Make sure to deregister the SPI driver before releasing the tty driver
to avoid use-after-free in the SPI remove callback where the tty
devices are deregistered.

Fixes: 72d4724ea54c ("serial: ifx6x60: Add modem power off function in the platform reboot process")
Cc: Jun Chen 
Signed-off-by: Johan Hovold 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

serial: ifx6x60: Remove dangerous spi_driver casts

2017-09-15T17:29:45+00:00

commit 9a499db0325b8a8e2368f21fef66705b120f38ba upstream.

Casting spi_driver pointers to "void *" when calling
spi_{,un}register_driver() bypasses all type checking.

Remove the superfluous casts to fix this.

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

serial: efm32: Fix parity management in 'efm32_uart_console_get_options()'

2017-09-15T17:29:45+00:00

commit be40597a1bc173bf9dadccdf5388b956f620ae8f upstream.

UARTn_FRAME_PARITY_ODD is 0x0300
UARTn_FRAME_PARITY_EVEN is 0x0200
So if the UART is configured for EVEN parity, it would be reported as ODD.
Fix it by correctly testing if the 2 bits are set.

Fixes: 3afbd89c9639 ("serial/efm32: add new driver")
Signed-off-by: Christophe JAILLET 
Acked-by: Uwe Kleine-König 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings

serial: omap: suspend device on probe errors

2017-08-26T01:14:31+00:00

commit 77e6fe7fd2b7cba0bf2f2dc8cde51d7b9a35bf74 upstream.

Make sure to actually suspend the device before returning after a failed
(or deferred) probe.

Note that autosuspend must be disabled before runtime pm is disabled in
order to balance the usage count due to a negative autosuspend delay as
well as to make the final put suspend the device synchronously.

Fixes: 388bc2622680 ("omap-serial: Fix the error handling in the omap_serial probe")
Cc: Shubhrajyoti D 
Signed-off-by: Johan Hovold 
Acked-by: Tony Lindgren 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Ben Hutchings