serial: 8250_dw: Store LSR into lsr_saved_flags in dw8250_tx_wait_empty()

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[ Upstream commit af14f3007e ]

Make sure LSR flags are preserved in dw8250_tx_wait_empty(). This
function is called from a low-level out function and therefore cannot
call serial_lsr_in() as it would lead to infinite recursion.

It is borderline if the flags need to be saved here at all since this
code relates to writing LCR register which usually implies no important
characters should be arriving.

Fixes: 914eaf935e ("serial: 8250_dw: Allow TX FIFO to drain before writing to UART_LCR")
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220608095431.18376-7-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Ilpo Järvinen 2022-06-08 12:54:31 +03:00 • committed by Greg Kroah-Hartman

parent 3de3d9c971

commit 610a3a8a6c

1 changed files with 3 additions and 0 deletions

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drivers/tty/serial/8250/8250_dw.c

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