serial: stm32: defer sysrq processing
authorJohan Hovold <johan@kernel.org>
Fri, 16 Apr 2021 14:05:57 +0000 (16:05 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 22 Apr 2021 10:04:26 +0000 (12:04 +0200)
commitcea37afd28f1bb7ca09a0c27e75f89cf2df9147d
tree839af875427d4d30a151c33020ca4362dd41c83e
parente359b4411c2836cf87c8776682d1b594635570de
serial: stm32: defer sysrq processing

Use the uart_unlock_and_check_sysrq() helper to defer sysrq processing
until receive processing is done and the port lock has been released.

This allows cleaning up the console_write() implementation by not having
to work around the recursive sysrq case (by dropping locking completely)
and also makes the console code work with PREEMPT_RT by no longer
relying on local_irq_save().

Reviewed-by: Valentin Caron<valentin.caron@foss.st.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210416140557.25177-4-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/tty/serial/stm32-usart.c