• Richard Purdie's avatar
    backlight: Fix external uses of backlight internal semaphore · 28ee086d
    Richard Purdie authored
    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: default avatarRichard Purdie <rpurdie@rpsys.net>
    28ee086d
backlight.h 2.77 KB