drivers/gpio/pca953x.c: add a mutex to fix race condition

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Add a mutex to register communication and handling.  Without the mutex,
GPIOs didn't switch as expected when toggled in a fast sequence of
status changes of multiple outputs.

Signed-off-by: Roland Stigge <stigge@antcom.de>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Marc Zyngier <maz@misterjones.org>
Cc: Ben Gardner <bgardner@wabtec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

...

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Roland Stigge 2011-02-10 15:01:23 -08:00 • committed by Linus Torvalds

parent 01e05e9a90

commit 6e20fb1805

1 changed files with 22 additions and 6 deletions

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drivers/gpio/pca953x.c

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