| Message ID | 20200610230541.1603067-4-niklas.soderlund+renesas@ragnatech.se (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | media-device: Report if graph is complete | expand |
Hi Niklas, Thank you for the patch. On Thu, Jun 11, 2020 at 01:05:39AM +0200, Niklas Söderlund wrote: > When the notifier completes set the complete flag in the struct > media_device. This flag can can then be reported to user-space to let it > know the graph is complete. > > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > --- > drivers/media/v4l2-core/v4l2-async.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c > index 8bde33c21ce45f98..331594ca5b3bb723 100644 > --- a/drivers/media/v4l2-core/v4l2-async.c > +++ b/drivers/media/v4l2-core/v4l2-async.c > @@ -217,6 +217,11 @@ v4l2_async_notifier_try_complete(struct v4l2_async_notifier *notifier) > if (!v4l2_async_notifier_can_complete(notifier)) > return 0; > > +#if defined(CONFIG_MEDIA_CONTROLLER) > + if (notifier->v4l2_dev->mdev) > + notifier->v4l2_dev->mdev->complete = true; > +#endif Does this work with sub-notifiers ? > + > return v4l2_async_notifier_call_complete(notifier); Isn't there a race here, if we report the complete flag before the notifier calls the .complete() operation ? > } >
Hi Niklas, On Thu, Jun 11, 2020 at 01:05:39AM +0200, Niklas Söderlund wrote: > When the notifier completes set the complete flag in the struct > media_device. This flag can can then be reported to user-space to let it > know the graph is complete. > > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > --- > drivers/media/v4l2-core/v4l2-async.c | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c > index 8bde33c21ce45f98..331594ca5b3bb723 100644 > --- a/drivers/media/v4l2-core/v4l2-async.c > +++ b/drivers/media/v4l2-core/v4l2-async.c > @@ -217,6 +217,11 @@ v4l2_async_notifier_try_complete(struct v4l2_async_notifier *notifier) > if (!v4l2_async_notifier_can_complete(notifier)) > return 0; > > +#if defined(CONFIG_MEDIA_CONTROLLER) > + if (notifier->v4l2_dev->mdev) > + notifier->v4l2_dev->mdev->complete = true; > +#endif > + > return v4l2_async_notifier_call_complete(notifier); > } > Do we need this? Could you not use the complete callback from the main notifier, that gets called only when all async subdevs have been bound?
On Thu, Jun 11, 2020 at 01:50:19PM +0300, Sakari Ailus wrote: > Hi Niklas, > > On Thu, Jun 11, 2020 at 01:05:39AM +0200, Niklas Söderlund wrote: > > When the notifier completes set the complete flag in the struct > > media_device. This flag can can then be reported to user-space to let it > > know the graph is complete. > > > > Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> > > --- > > drivers/media/v4l2-core/v4l2-async.c | 5 +++++ > > 1 file changed, 5 insertions(+) > > > > diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c > > index 8bde33c21ce45f98..331594ca5b3bb723 100644 > > --- a/drivers/media/v4l2-core/v4l2-async.c > > +++ b/drivers/media/v4l2-core/v4l2-async.c > > @@ -217,6 +217,11 @@ v4l2_async_notifier_try_complete(struct v4l2_async_notifier *notifier) > > if (!v4l2_async_notifier_can_complete(notifier)) > > return 0; > > > > +#if defined(CONFIG_MEDIA_CONTROLLER) > > + if (notifier->v4l2_dev->mdev) > > + notifier->v4l2_dev->mdev->complete = true; > > +#endif > > + > > return v4l2_async_notifier_call_complete(notifier); > > } > > > > Do we need this? Could you not use the complete callback from the main > notifier, that gets called only when all async subdevs have been bound? Ah. Please ignore the comment. Something like this is needed for the flag.
diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c index 8bde33c21ce45f98..331594ca5b3bb723 100644 --- a/drivers/media/v4l2-core/v4l2-async.c +++ b/drivers/media/v4l2-core/v4l2-async.c @@ -217,6 +217,11 @@ v4l2_async_notifier_try_complete(struct v4l2_async_notifier *notifier) if (!v4l2_async_notifier_can_complete(notifier)) return 0; +#if defined(CONFIG_MEDIA_CONTROLLER) + if (notifier->v4l2_dev->mdev) + notifier->v4l2_dev->mdev->complete = true; +#endif + return v4l2_async_notifier_call_complete(notifier); }
When the notifier completes set the complete flag in the struct media_device. This flag can can then be reported to user-space to let it know the graph is complete. Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> --- drivers/media/v4l2-core/v4l2-async.c | 5 +++++ 1 file changed, 5 insertions(+)