On Wed, Oct 09, 2024 at 06:01:45AM +0000, Sakari Ailus wrote: > Hi Laurent, > > On Mon, Oct 07, 2024 at 09:16:54PM +0300, Laurent Pinchart wrote: > > Hi Prabhakar, > > > > Thank you for the patch. > > > > On Mon, Oct 07, 2024 at 01:38:09PM +0100, Prabhakar wrote: > > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> > > > > > > The `get_frame_desc()` operation should always be called on a source pad, > > > which is indicated by the `MEDIA_PAD_FL_SOURCE` flag. This patch adds a > > > check in `call_get_frame_desc()` to ensure that the `MEDIA_PAD_FL_SOURCE` > > > flag is set for the pad before invoking `get_frame_desc()`. If the pad is > > > not a source pad, the function will return an `-EOPNOTSUPP` error, > > > signaling that the operation is not supported on non-source pads. > > > > > > Suggested-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx> > > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> > > > --- > > > v1->v2 > > > - Added a check for CONFIG_MEDIA_CONTROLLER, as the `entity` member in > > > `struct v4l2_subdev` is only available when CONFIG_MEDIA_CONTROLLER > > > is enabled. > > > --- > > > drivers/media/v4l2-core/v4l2-subdev.c | 5 +++++ > > > 1 file changed, 5 insertions(+) > > > > > > diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c > > > index de9ac67574bb..446fbc3805c7 100644 > > > --- a/drivers/media/v4l2-core/v4l2-subdev.c > > > +++ b/drivers/media/v4l2-core/v4l2-subdev.c > > > @@ -325,6 +325,11 @@ static int call_get_frame_desc(struct v4l2_subdev *sd, unsigned int pad, > > > unsigned int i; > > > int ret; > > > > > > +#if defined(CONFIG_MEDIA_CONTROLLER) > > > + if (!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE)) > > > > As this should really not happen, I wonder if we shouldn't be more > > vocal: > > > > if (WARN_ON(!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE))) > > > > Sakari, what do you think ? Either way, > > I wouldn't as this is probably going to be user-triggerable. The problem > shouldn't be too hard to find out either. I don't expect .get_frame_desc() to be callable with user-controllable arguments, but I'm OK not using WARN_ON(). > > Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx> > > Thanks! -- Regards, Laurent Pinchart
