Messages in this thread | | | Subject | Re: [PATCH] backlight: grab ops_lock before testing bd->ops | From | Richard Purdie <> | Date | Mon, 22 Nov 2010 09:59:07 +0000 |
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On Mon, 2010-11-22 at 10:43 +0100, Uwe Kleine-König wrote: > According to the comment describing ops_lock in the definition of > struct backlight_device and when comparing with other functions in > backlight.c the mutex must be hold when checking ops to be non-NULL. > > Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Richard Purdie <rpurdie@linux.intel.com>
> --- > drivers/video/backlight/backlight.c | 12 ++++++------ > 1 files changed, 6 insertions(+), 6 deletions(-) > > diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c > index e207810..0870329 100644 > --- a/drivers/video/backlight/backlight.c > +++ b/drivers/video/backlight/backlight.c > @@ -197,12 +197,12 @@ static int backlight_suspend(struct device *dev, pm_message_t state) > { > struct backlight_device *bd = to_backlight_device(dev); > > - if (bd->ops->options & BL_CORE_SUSPENDRESUME) { > - mutex_lock(&bd->ops_lock); > + mutex_lock(&bd->ops_lock); > + if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) { > bd->props.state |= BL_CORE_SUSPENDED; > backlight_update_status(bd); > - mutex_unlock(&bd->ops_lock); > } > + mutex_unlock(&bd->ops_lock); > > return 0; > } > @@ -211,12 +211,12 @@ static int backlight_resume(struct device *dev) > { > struct backlight_device *bd = to_backlight_device(dev); > > - if (bd->ops->options & BL_CORE_SUSPENDRESUME) { > - mutex_lock(&bd->ops_lock); > + mutex_lock(&bd->ops_lock); > + if (bd->ops && bd->ops->options & BL_CORE_SUSPENDRESUME) { > bd->props.state &= ~BL_CORE_SUSPENDED; > backlight_update_status(bd); > - mutex_unlock(&bd->ops_lock); > } > + mutex_unlock(&bd->ops_lock); > > return 0; > }
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