| Message ID | 1496829127-28375-1-git-send-email-kbingham@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Wed, Jun 07, 2017 at 10:52:07AM +0100, Kieran Bingham wrote: > From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > > Return NULL, if a null entity is parsed for it's v4l2_subdev > > Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Em Wed, 7 Jun 2017 10:52:07 +0100 Kieran Bingham <kbingham@kernel.org> escreveu: > From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > > Return NULL, if a null entity is parsed for it's v4l2_subdev > > Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> Could you please improve this patch description? I'm unsure if this is a bug fix, or some sort of feature... On what situations would a null entity be passed to this function? Regards, Mauro > > --- > Not sure if this patch ever made it out of my mailbox: > > Here's the respin with the parameter evaluated only once. > > v4: > - Improve macro usage to evaluate ent only once > > include/media/v4l2-subdev.h | 11 +++++++++-- > 1 file changed, 9 insertions(+), 2 deletions(-) > > diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h > index a40760174797..0f92ebd2d710 100644 > --- a/include/media/v4l2-subdev.h > +++ b/include/media/v4l2-subdev.h > @@ -826,8 +826,15 @@ struct v4l2_subdev { > struct v4l2_subdev_platform_data *pdata; > }; > > -#define media_entity_to_v4l2_subdev(ent) \ > - container_of(ent, struct v4l2_subdev, entity) > +#define media_entity_to_v4l2_subdev(ent) \ > +({ \ > + typeof(ent) __me_sd_ent = (ent); \ > + \ > + __me_sd_ent ? \ > + container_of(__me_sd_ent, struct v4l2_subdev, entity) : \ > + NULL; \ > +}) > + > #define vdev_to_v4l2_subdev(vdev) \ > ((struct v4l2_subdev *)video_get_drvdata(vdev)) > Thanks, Mauro
Hi Mauro, On Thu, Jun 08, 2017 at 03:00:22PM -0300, Mauro Carvalho Chehab wrote: > Em Wed, 7 Jun 2017 10:52:07 +0100 > Kieran Bingham <kbingham@kernel.org> escreveu: > > > From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > > > > Return NULL, if a null entity is parsed for it's v4l2_subdev > > > > Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > > Could you please improve this patch description? > > I'm unsure if this is a bug fix, or some sort of feature... > > On what situations would a null entity be passed to this function? I actually proposed this patch. This change is simply for convenience --- the caller doesn't need to make sure the subdev is non-NULL, possibly obtained from e.g. media_entity_remote_pad() which returns NULL all links to the pad are disabled. This is a recurring pattern, and making this change avoids an additional check. Having something along these lines in the patch description wouldn't hurt.
Em Thu, 8 Jun 2017 22:32:10 +0300 Sakari Ailus <sakari.ailus@iki.fi> escreveu: > Hi Mauro, > > On Thu, Jun 08, 2017 at 03:00:22PM -0300, Mauro Carvalho Chehab wrote: > > Em Wed, 7 Jun 2017 10:52:07 +0100 > > Kieran Bingham <kbingham@kernel.org> escreveu: > > > > > From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > > > > > > Return NULL, if a null entity is parsed for it's v4l2_subdev > > > > > > Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> > > > > Could you please improve this patch description? > > > > I'm unsure if this is a bug fix, or some sort of feature... > > > > On what situations would a null entity be passed to this function? > > I actually proposed this patch. This change is simply for convenience --- > the caller doesn't need to make sure the subdev is non-NULL, possibly > obtained from e.g. media_entity_remote_pad() which returns NULL all links to > the pad are disabled. This is a recurring pattern, and making this change > avoids an additional check. > > Having something along these lines in the patch description wouldn't hurt. Patch added, with a description based on the above. Thanks! Mauro
Hi Sakari, Mauro, On 08/06/17 21:10, Mauro Carvalho Chehab wrote: > Em Thu, 8 Jun 2017 22:32:10 +0300 > Sakari Ailus <sakari.ailus@iki.fi> escreveu: > >> Hi Mauro, >> >> On Thu, Jun 08, 2017 at 03:00:22PM -0300, Mauro Carvalho Chehab wrote: >>> Em Wed, 7 Jun 2017 10:52:07 +0100 >>> Kieran Bingham <kbingham@kernel.org> escreveu: >>> >>>> From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> >>>> >>>> Return NULL, if a null entity is parsed for it's v4l2_subdev >>>> >>>> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> >>> >>> Could you please improve this patch description? >>> >>> I'm unsure if this is a bug fix, or some sort of feature... >>> >>> On what situations would a null entity be passed to this function? Sorry for not being clear enough there ... >> >> I actually proposed this patch. This change is simply for convenience --- >> the caller doesn't need to make sure the subdev is non-NULL, possibly >> obtained from e.g. media_entity_remote_pad() which returns NULL all links to >> the pad are disabled. This is a recurring pattern, and making this change >> avoids an additional check. >> >> Having something along these lines in the patch description wouldn't hurt. Yes, the above looks good ... > Patch added, with a description based on the above. And thank you :) Regards -- Kieran
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h index a40760174797..0f92ebd2d710 100644 --- a/include/media/v4l2-subdev.h +++ b/include/media/v4l2-subdev.h @@ -826,8 +826,15 @@ struct v4l2_subdev { struct v4l2_subdev_platform_data *pdata; }; -#define media_entity_to_v4l2_subdev(ent) \ - container_of(ent, struct v4l2_subdev, entity) +#define media_entity_to_v4l2_subdev(ent) \ +({ \ + typeof(ent) __me_sd_ent = (ent); \ + \ + __me_sd_ent ? \ + container_of(__me_sd_ent, struct v4l2_subdev, entity) : \ + NULL; \ +}) + #define vdev_to_v4l2_subdev(vdev) \ ((struct v4l2_subdev *)video_get_drvdata(vdev))