Hi Laurent, On Mon, Dec 08, 2014 at 02:17:11AM +0200, Laurent Pinchart wrote: > Hi Sakari, > > On Wednesday 03 December 2014 13:06:00 Sakari Ailus wrote: > > On Tue, Dec 02, 2014 at 01:21:40PM +0100, Hans Verkuil wrote: > > > From: Hans Verkuil <hans.verk...@cisco.com> > > > > > > The crop and selection pad ops are duplicates. Replace all uses of > > > get/set_crop by get/set_selection. This will make it possible to drop > > > get/set_crop altogether. > > > > > > Signed-off-by: Hans Verkuil <hans.verk...@cisco.com> > > > Cc: Sylwester Nawrocki <s.nawro...@samsung.com> > > > Cc: Laurent Pinchart <laurent.pinch...@ideasonboard.com> > > > Cc: Prabhakar Lad <prabhakar.cse...@gmail.com> > > > Cc: Philipp Zabel <p.za...@pengutronix.de> > > > > For both: > > > > Acked-by: Sakari Ailus <sakari.ai...@linux.intel.com> > > > > Another point I'd like to draw attention to are the reserved fields --- some > > drivers appear to zero them whereas some pay no attention. Shouldn't we > > check in the sub-device IOCTL handler that the user has zeroed them, or > > zero them for the user? I think this has probably been discussed before on > > V4L2. Both have their advantages, probably zeroing them in the framework > > would be the best option. What do you think? > > I think we should at least be consistent across drivers. Duplicating checks > across drivers being more error-prone it would likely be better to implement > them in core code. The question that remains to be answered is whether we can > consider that bridge drivers will correctly zero reserved fields when using > the API internally. If not, we'll need wrapper functions around subdev > operations to zero reserved fields, or possibly just to output a WARN_ON (as > a > bridge driver bug should be fixed instead of silently ignored).
I'd simply check these fields in v4l2-subdev.c ioctl wrappers. There are over 300 instances of v4l2_subdev_call(). It's at least possible to audit them. I'd favour that over adding a wrapper to each op, and then paying attention to the topic in reviews. It's not only a matter of that interface. -- Regards, Sakari Ailus e-mail: sakari.ai...@iki.fi XMPP: sai...@retiisi.org.uk -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
