serial: 8250: Create serial_lsr_in()

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[ Upstream commit bdb70c424d ]

LSR register readers need to be careful in order to not lose bits that
are not preserved across reads. Create a helper that takes care of
storing the non-preserved bits into lsr_save_flags.

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220608095431.18376-3-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 12:54:27 +03:00 • committed by Greg Kroah-Hartman

parent 597bcd854a

commit 623e3648c5

3 changed files with 25 additions and 13 deletions

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20

drivers/tty/serial/8250/8250.h

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3

drivers/tty/serial/8250/8250_core.c

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15

drivers/tty/serial/8250/8250_port.c

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