i2c: qup: jump out of the loop in case of timeout

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commit a7982a14b3 upstream.

Original logic only sets the return value but doesn't jump out of the
loop if the bus is kept active by a client. This is not expected. A
malicious or buggy i2c client can hang the kernel in this case and
should be avoided. This is observed during a long time test with a
PCA953x GPIO extender.

Fix it by changing the logic to not only sets the return value, but also
jumps out of the loop and return to the caller with -ETIMEDOUT.

Fixes: fbfab1ab06 ("i2c: qup: reorganization of driver code to remove polling for qup v1")
Signed-off-by: Yang Xiwen <forbidden405@outlook.com>
Cc: <stable@vger.kernel.org> # v4.17+
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250616-qca-i2c-v1-1-2a8d37ee0a30@outlook.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Yang Xiwen 2025-06-16 00:01:10 +08:00 • committed by Greg Kroah-Hartman

parent 9ea8a9ebbe

commit 42c4471b30

1 changed files with 3 additions and 1 deletions

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drivers/i2c/busses/i2c-qup.c

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