Hi Laurent, Thanks for the patch. One comment below...
On Fri, Mar 25, 2016 at 05:27:45PM +0200, Laurent Pinchart wrote: > From: Laurent Pinchart <[email protected]> > > Add a new subdev operation to initialize a subdev pad config array, and > a helper function to allocate and initialize the array. This can be used > by bridge drivers to implement try format based on subdev pad > operations. > > Signed-off-by: Laurent Pinchart <[email protected]> > Acked-by: Vaibhav Hiremath <[email protected]> > Acked-by: Hans Verkuil <[email protected]> > --- > drivers/media/v4l2-core/v4l2-subdev.c | 37 > ++++++++++++++++++++++++++++++++--- > include/media/v4l2-subdev.h | 8 ++++++++ > 2 files changed, 42 insertions(+), 3 deletions(-) > > Changes since v2: > > - Don't fail due to pad config allocation when the subdev has no pad. > > diff --git a/drivers/media/v4l2-core/v4l2-subdev.c > b/drivers/media/v4l2-core/v4l2-subdev.c > index 0fa60801a428..8c6f016d1791 100644 > --- a/drivers/media/v4l2-core/v4l2-subdev.c > +++ b/drivers/media/v4l2-core/v4l2-subdev.c > @@ -35,9 +35,11 @@ > static int subdev_fh_init(struct v4l2_subdev_fh *fh, struct v4l2_subdev *sd) > { > #if defined(CONFIG_VIDEO_V4L2_SUBDEV_API) > - fh->pad = kzalloc(sizeof(*fh->pad) * sd->entity.num_pads, GFP_KERNEL); > - if (fh->pad == NULL) > - return -ENOMEM; > + if (sd->entity.num_pads) { > + fh->pad = v4l2_subdev_alloc_pad_config(sd); > + if (fh->pad == NULL) > + return -ENOMEM; > + } > #endif > return 0; > } > @@ -569,6 +571,35 @@ int v4l2_subdev_link_validate(struct media_link *link) > sink, link, &source_fmt, &sink_fmt); > } > EXPORT_SYMBOL_GPL(v4l2_subdev_link_validate); > + > +struct v4l2_subdev_pad_config * > +v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd) What's the use case for calling v4l2_subdev_alloc_pad_config() elsewhere than from subdev_fh_init()? > +{ > + struct v4l2_subdev_pad_config *cfg; > + int ret; > + > + if (!sd->entity.num_pads) > + return NULL; > + > + cfg = kcalloc(sd->entity.num_pads, sizeof(*cfg), GFP_KERNEL); > + if (!cfg) > + return NULL; > + > + ret = v4l2_subdev_call(sd, pad, init_cfg, cfg); > + if (ret < 0 && ret != -ENOIOCTLCMD) { > + kfree(cfg); > + return NULL; > + } > + > + return cfg; > +} > +EXPORT_SYMBOL_GPL(v4l2_subdev_alloc_pad_config); > + > +void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg) > +{ > + kfree(cfg); Not really a bug but --- I think it'd be cleaner to call this from v4l2_fh_cleanup(), rather than freeing cfg directly using kfree(). > +} > +EXPORT_SYMBOL_GPL(v4l2_subdev_free_pad_config); > #endif /* CONFIG_MEDIA_CONTROLLER */ > > void v4l2_subdev_init(struct v4l2_subdev *sd, const struct v4l2_subdev_ops > *ops) > diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h > index 11e2dfec0198..32fc7a4beb5e 100644 > --- a/include/media/v4l2-subdev.h > +++ b/include/media/v4l2-subdev.h > @@ -572,6 +572,7 @@ struct v4l2_subdev_pad_config { > /** > * struct v4l2_subdev_pad_ops - v4l2-subdev pad level operations > * > + * @init_cfg: initialize the pad config to default values > * @enum_mbus_code: callback for VIDIOC_SUBDEV_ENUM_MBUS_CODE ioctl handler > * code. > * @enum_frame_size: callback for VIDIOC_SUBDEV_ENUM_FRAME_SIZE ioctl handler > @@ -607,6 +608,8 @@ struct v4l2_subdev_pad_config { > * may be adjusted by the subdev driver to device > capabilities. > */ > struct v4l2_subdev_pad_ops { > + int (*init_cfg)(struct v4l2_subdev *sd, > + struct v4l2_subdev_pad_config *cfg); > int (*enum_mbus_code)(struct v4l2_subdev *sd, > struct v4l2_subdev_pad_config *cfg, > struct v4l2_subdev_mbus_code_enum *code); > @@ -801,7 +804,12 @@ int v4l2_subdev_link_validate_default(struct v4l2_subdev > *sd, > struct v4l2_subdev_format *source_fmt, > struct v4l2_subdev_format *sink_fmt); > int v4l2_subdev_link_validate(struct media_link *link); > + > +struct v4l2_subdev_pad_config * > +v4l2_subdev_alloc_pad_config(struct v4l2_subdev *sd); > +void v4l2_subdev_free_pad_config(struct v4l2_subdev_pad_config *cfg); > #endif /* CONFIG_MEDIA_CONTROLLER */ > + > void v4l2_subdev_init(struct v4l2_subdev *sd, > const struct v4l2_subdev_ops *ops); > -- Kind regards, Sakari Ailus e-mail: [email protected] XMPP: [email protected] -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
