linux-stable.git/drivers/tty, branch v4.9.167

Disable kgdboc failed by echo space to /sys/module/kgdboc/parameters/kgdboc

2019-04-03T04:24:19+00:00

commit 3ec8002951ea173e24b466df1ea98c56b7920e63 upstream.

Echo "" to /sys/module/kgdboc/parameters/kgdboc will fail with "No such
device” error.

This is caused by function "configure_kgdboc" who init err to ENODEV
when the config is empty (legal input) the code go out with ENODEV
returned.

Fixes: 2dd453168643 ("kgdboc: Fix restrict error")
Signed-off-by: Wentao Wang 
Cc: stable 
Acked-by: Daniel Thompson 
Signed-off-by: Greg Kroah-Hartman

serial: sh-sci: Fix setting SCSCR_TIE while transferring data

2019-04-03T04:24:18+00:00

commit 93bcefd4c6bad4c69dbc4edcd3fbf774b24d930d upstream.

We disable transmission interrupt (clear SCSCR_TIE) after all data has been transmitted
(if uart_circ_empty(xmit)). While transmitting, if the data is still in the tty buffer,
re-enable the SCSCR_TIE bit, which was done at sci_start_tx().
This is unnecessary processing, wasting CPU operation if the data transmission length is large.
And further, transmit end, FIFO empty bits disabling have also been performed in the step above.

Signed-off-by: Hoan Nguyen An 
Cc: stable 
Signed-off-by: Greg Kroah-Hartman

serial: max310x: Fix to avoid potential NULL pointer dereference

2019-04-03T04:24:18+00:00

commit 3a10e3dd52e80b9a97a3346020024d17b2c272d6 upstream.

of_match_device can return a NULL pointer when matching device is not
found. This patch avoids a scenario causing NULL pointer derefernce.

Signed-off-by: Aditya Pakki 
Cc: stable 
Signed-off-by: Greg Kroah-Hartman

tty: atmel_serial: fix a potential NULL pointer dereference

2019-04-03T04:24:17+00:00

commit c85be041065c0be8bc48eda4c45e0319caf1d0e5 upstream.

In case dmaengine_prep_dma_cyclic fails, the fix returns a proper
error code to avoid NULL pointer dereference.

Signed-off-by: Kangjie Lu 
Fixes: 34df42f59a60 ("serial: at91: add rx dma support")
Acked-by: Richard Genoud 
Cc: stable 
Signed-off-by: Greg Kroah-Hartman

serial: sprd: clear timeout interrupt only rather than all interrupts

2019-03-27T05:13:04+00:00

commit 4350782570b919f254c1e083261a21c19fcaee90 upstream.

On Spreadtrum's serial device, nearly all of interrupts would be cleared
by hardware except timeout interrupt.  This patch removed the operation
of clearing all interrupt in irq handler, instead added an if statement
to check if the timeout interrupt is supposed to be cleared.

Wrongly clearing timeout interrupt would lead to uart data stay in rx
fifo, that means the driver cannot read them out anymore.

Signed-off-by: Lanqing Liu 
Signed-off-by: Chunyan Zhang 
Signed-off-by: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

serial: sprd: adjust TIMEOUT to a big value

2019-03-27T05:13:04+00:00

commit e1dc9b08051a2c2e694edf48d1e704f07c7c143c upstream.

SPRD_TIMEOUT was 256, which is too small to wait until the status
switched to workable in a while loop, so that the earlycon could
not work correctly.

Signed-off-by: Wei Qiao 
Signed-off-by: Chunyan Zhang 
Signed-off-by: Arnd Bergmann 
Signed-off-by: Greg Kroah-Hartman

serial: 8250_pci: Have ACCES cards that use the four port Pericom PI7C9X7954 chip use the pci_pericom_setup()

2019-03-23T12:19:51+00:00

commit 78d3820b9bd39028727c6aab7297b63c093db343 upstream.

The four port Pericom chips have the fourth port at the wrong address.
Make use of quirk to fix it.

Fixes: c8d192428f52 ("serial: 8250: added acces i/o products quad and octal serial cards")
Cc: stable 
Signed-off-by: Jay Dolan 
Signed-off-by: Greg Kroah-Hartman

serial: 8250_pci: Fix number of ports for ACCES serial cards

2019-03-23T12:19:51+00:00

commit b896b03bc7fce43a07012cc6bf5e2ab2fddf3364 upstream.

Have the correct number of ports created for ACCES serial cards. Two port
cards show up as four ports, and four port cards show up as eight.

Fixes: c8d192428f52 ("serial: 8250: added acces i/o products quad and octal serial cards")
Signed-off-by: Jay Dolan 
Cc: stable 
Signed-off-by: Greg Kroah-Hartman

8250: FIX Fourth port offset of Pericom PI7C9X7954 boards

2019-03-23T12:19:50+00:00

commit 5c31ef91c06db7800ad573174bd92be4df34ecb2 upstream.

Hi,
below patch to fix Fourth port offset of Percom PI7C9X7954 boards.

I had a problem using Fourth port on a pci express serial board based on Pericom
PI7C9X7954. Reading datasheet I notice a "special" offset assign to this port
when used in I/O mode.

Offset 0x0 ->  UART 0
Offset 0x8 ->  UART 1
Offset 0x10 ->  UART 2
Offset 0x38 ->  UART 3  <<---- This don't follow a logical sequence

This patch add a different init to last port, to have right offset.

I check also Pericom 7952 and 7958 but that devices follow logical sequence,
so they are ok.

Regards,
Angelo

Signed-off-by: Angelo Butti 
Signed-off-by: Greg Kroah-Hartman

serial: 8250_of: assume reg-shift of 2 for mrvl,mmp-uart

2019-03-23T12:19:50+00:00

commit f4817843e39ce78aace0195a57d4e8500a65a898 upstream.

There are two other drivers that bind to mrvl,mmp-uart and both of them
assume register shift of 2 bits. There are device trees that lack the
property and rely on that assumption.

If this driver wins the race to bind to those devices, it should behave
the same as the older deprecated driver.

Signed-off-by: Lubomir Rintel 
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman