serial: fsl_lpuart: add sysrq support when using dma

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Add handling of magic sysrq keys when using dma/edma.

Tested by sending BREAK followed by a sysrq command inside
a 5 secs time window, by:

echo 1 > /proc/sys/kernel/sysrq

BREAK + h, t, e, b, c

Tested also sending a command after 5 secs after BREAK, that's
properly ignored.

Signed-off-by: Angelo Dureghello <angelo.dureghello@timesys.com>
Link: https://lore.kernel.org/r/20201004161144.1307174-1-angelo.dureghello@timesys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Angelo Dureghello 2020-10-04 18:11:44 +02:00 • committed by Greg Kroah-Hartman

parent bfeb28539d

commit f4eef224a0

1 changed files with 57 additions and 0 deletions

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drivers/tty/serial/fsl_lpuart.c

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