Hi Mauro,
On Sunday 11 January 2015 11:58:24 Mauro Carvalho Chehab wrote:
> Em Sun, 11 Jan 2015 15:50:04 +0200 Laurent Pinchart escreveu:
> > On Saturday 03 January 2015 12:49:03 Mauro Carvalho Chehab wrote:
> >> The DVB devices are identified via a (major, minor) tuple,
> >> and not by a random id. Fix it, before we start using it.
> >>
> >> Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
> >>
> >> diff --git a/include/media/media-entity.h b/include/media/media-entity.h
> >> index e00459185d20..de333cc8261b 100644
> >> --- a/include/media/media-entity.h
> >> +++ b/include/media/media-entity.h
> >> @@ -97,7 +97,10 @@ struct media_entity {
> >> u32 device;
> >> u32 subdevice;
> >> } alsa;
> >> - int dvb;
> >> + struct {
> >> + u32 major;
> >> + u32 minor;
> >> + } dvb;
> >>
> >> /* Sub-device specifications */
> >> /* Nothing needed yet */
> >> diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
> >> index d847c760e8f0..7902e800f019 100644
> >> --- a/include/uapi/linux/media.h
> >> +++ b/include/uapi/linux/media.h
> >> @@ -27,7 +27,7 @@
> >> #include <linux/types.h>
> >> #include <linux/version.h>
> >>
> >> -#define MEDIA_API_VERSION KERNEL_VERSION(0, 1, 0)
> >> +#define MEDIA_API_VERSION KERNEL_VERSION(0, 1, 1)
> >>
> >> struct media_device_info {
> >> char driver[16];
> >> @@ -88,7 +88,10 @@ struct media_entity_desc {
> >> __u32 device;
> >> __u32 subdevice;
> >> } alsa;
> >> - int dvb;
> >> + struct {
> >> + __u32 major;
> >> + __u32 minor;
> >> + } dvb;
> >
> > Won't this break compilation of existing userspace code ? As DVB is not
> > properly supported in MC at the moment we could consider that only
> > mediactl will be affected, so it shouldn't be a big issue.
>
> Well, media-ctl uses a local copy of the videodev2.h header, so it won't
> break.
It's media.h, but you're correct here.
> I'm not aware of any other application using MC for DVB.
>
> Yet, imagining that such application exists, then, IMHO, it is better
> to break compilation for it, as probably such application was written for
> some OOT driver that might be using its own version of the media
> controller implementation.
OK. I'll remember that argument the next time I want to break a kernel API
though ;-)
--
Regards,
Laurent Pinchart
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