serial: max310x: prevent infinite while() loop in port startup

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commit b35f8dbbce upstream.

If there is a problem after resetting a port, the do/while() loop that
checks the default value of DIVLSB register may run forever and spam the
I2C bus.

Add a delay before each read of DIVLSB, and a maximum number of tries to
prevent that situation from happening.

Also fail probe if port reset is unsuccessful.

Fixes: 10d8b34a42 ("serial: max310x: Driver rework")
Cc: stable@vger.kernel.org
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Link: https://lore.kernel.org/r/20240116213001.3691629-5-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Hugo Villeneuve 2024-01-16 16:30:01 -05:00 • committed by Greg Kroah-Hartman

parent 0046dd2e9f

commit 5e2f407646

1 changed files with 18 additions and 2 deletions

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drivers/tty/serial/max310x.c

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