backlight: Fix external uses of backlight internal semaphore

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backlight_device->sem has a very specific use as documented in the
header file. The external users of this are using it for a different
reason, to serialise access to the update_status() method.

backlight users were supposed to implement their own internal
serialisation of update_status() if needed but everyone is doing
things differently and incorrectly. Therefore add a global mutex to
take care of serialisation for everyone, once and for all.

Locking for get_brightness remains optional since most users don't
need it.

Also update the lcd class in a similar way.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

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This commit is contained in:

Richard Purdie 2007-02-08 22:25:09 +00:00

parent a8db3c1948

commit 28ee086d5b

15 changed files with 76 additions and 76 deletions

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26

include/linux/backlight.h

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26

include/linux/lcd.h

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