serial: stm32: re-introduce an irq flag condition in usart_receive_chars

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[ Upstream commit cc58d0a3f0 ]

Re-introduce an irq flag condition in usart_receive_chars.
This condition has been deleted by commit 75f4e830fa ("serial: do not
restore interrupt state in sysrq helper").
This code was present to handle threaded case, and has been removed
because it is no more needed in this case. Nevertheless an irq safe lock
is still needed in some cases, when DMA should be stopped to receive errors
or breaks in PIO mode.
This patch is a precursor to the complete rework or stm32 serial driver
DMA implementation.

Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Link: https://lore.kernel.org/r/20211020150332.10214-2-erwan.leray@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: c47527cbcc ("serial: stm32: Re-assert RTS/DE GPIO in RS485 mode only if more data are transmitted")
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Erwan Le Ray 2021-10-20 17:03:30 +02:00 • committed by Greg Kroah-Hartman

parent 4b7bb1c7be

commit 59ed254dd3

1 changed files with 13 additions and 8 deletions

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drivers/tty/serial/stm32-usart.c

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