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authorAlexander Stein <alexander.stein@systec-electronic.com>2012-05-29 15:07:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-29 16:22:32 -0700
commite7e11d8ba807d451857b5c68abe249c7fc2b980f (patch)
treed93a84ccd11589da51e93b76924d30d2f8eec626 /Documentation
parent44e1e9f8e70506728b02a18e6d03599a6485d67f (diff)
drivers/leds/leds-pca955x.c: fix race condition while setting brightness on several LEDs
When issuing the following command: for I in 0 1 2 3 4 5 6 7; do echo 0 > /sys/class/leds/pca955x\:${I}/brightness; done It is possible that all the pca955x_read_ls calls are done sequentially before any pca955x_write_ls call is done. This updates the LS only to the last LED update in its set. Fix this by using a global lock for the pca995x device during pca955x_led_work. Also used a struct for shared data betreen all LEDs. [akpm@linux-foundation.org: revert unintentional rename of pca955x_ledsel()] Signed-off-by: Alexander Stein <alexander.stein@systec-electronic.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Bryan Wu <bryan.wu@canonical.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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