On Wed, Apr 10, 2024 at 11:31:48AM +0000, Sakari Ailus wrote:
> Hi Hans,
>
> Thanks for the review.
>
> On Wed, Apr 10, 2024 at 12:12:33PM +0200, Hans de Goede wrote:
> > Hi Sakari,
> >
> > Thank you for fixing this.
> >
> > On 4/10/24 12:03 PM, Sakari Ailus wrote:
> > > Turn on the privacy LED only if streamon succeeds. This can be done after
> > > enabling streaming on the sensor.
> > >
> > > Fixes: b6e10ff6c23d ("media: v4l2-core: Make the v4l2-core code enable/disable the privacy LED if present")
> > > Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> > > ---
> > > drivers/media/v4l2-core/v4l2-subdev.c | 19 ++++++++++---------
> > > 1 file changed, 10 insertions(+), 9 deletions(-)
> > >
> > > diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> > > index 4c6198c48dd6..acb7c3003ab6 100644
> > > --- a/drivers/media/v4l2-core/v4l2-subdev.c
> > > +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> > > @@ -412,15 +412,6 @@ static int call_s_stream(struct v4l2_subdev *sd, int enable)
> > > if (WARN_ON(!!sd->enabled_streams == !!enable))
> > > return 0;
> > >
> > > -#if IS_REACHABLE(CONFIG_LEDS_CLASS)
> > > - if (!IS_ERR_OR_NULL(sd->privacy_led)) {
> > > - if (enable)
> > > - led_set_brightness(sd->privacy_led,
> > > - sd->privacy_led->max_brightness);
> > > - else
> > > - led_set_brightness(sd->privacy_led, 0);
> > > - }
> > > -#endif
> > > ret = sd->ops->video->s_stream(sd, enable);
> > >
> > > if (!enable && ret < 0) {
> > > @@ -431,6 +422,16 @@ static int call_s_stream(struct v4l2_subdev *sd, int enable)
> > > if (!ret)
> > > sd->enabled_streams = enable ? BIT(0) : 0;
> > >
> > > +#if IS_REACHABLE(CONFIG_LEDS_CLASS)
> > > + if (!IS_ERR_OR_NULL(sd->privacy_led) && !(enable && ret < 0)) {
> >
> > There already is a:
> >
> > if (!enable && ret < 0)
> > ret = 0;
> >
> > block above to ignore stream-off errors, so you can just test for:
> >
> > if (!ret && !IS_ERR_OR_NULL(sd->privacy_led)) {
> > ...
> > }
> >
> > And then you can move the whole block to inside the existing:
> >
> > if (!ret)
> > sd->enabled_streams = enable ? BIT(0) : 0;
> >
> > block, so you get something like this:
> >
> > if (!ret) {
> > sd->enabled_streams = enable ? BIT(0) : 0;
> > #if IS_REACHABLE(CONFIG_LEDS_CLASS)
> > if (!IS_ERR_OR_NULL(sd->privacy_led)) {
> > if (enable)
> > led_set_brightness(sd->privacy_led,
> > sd->privacy_led->max_brightness);
> > else
> > led_set_brightness(sd->privacy_led, 0);
> > }
> > #endif
> > }
>
> Seems reasonable, I'll send v2.
I was a bit too fast to hit y. ret will be non-zero if streamon fails
(enable non-zero), in which case the LED needs to be turned off. So you
can't have !ret condition for all LED control.
>
> >
> > Which then cleans up nicely by Tomi's patch
> > introducing the privacy LED helper functions,
> > to something like this:
> >
> > if (!ret {
> > if (enable) {
> > sd->enabled_streams = BIT(0);
> > v4l2_subdev_enable_privacy_led(sd);
> > } else {
> > sd->enabled_streams = 0;
> > v4l2_subdev_disable_privacy_led(sd);
> > }
> > }
> >
>
--
Sakari Ailus
