On Wed, Nov 14, 2018 at 11:37:53AM +0200, Sakari Ailus wrote:
> [ upstream commit 92539d3eda2c090b382699bbb896d4b54e9bdece ]
>
> Patch ad608fbcf166 changed how events were subscribed to address an issue
> elsewhere. As a side effect of that change, the "add" callback was called
> before the event subscription was added to the list of subscribed events,
> causing the first event queued by the add callback (and possibly other
> events arriving soon afterwards) to be lost.
>
> Fix this by adding the subscription to the list before calling the "add"
> callback, and clean up afterwards if that fails.
>
> Fixes: ad608fbcf166 ("media: v4l: event: Prevent freeing event subscriptions while accessed")
>
> Reported-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> Tested-by: Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx>
> Reviewed-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> Tested-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx>
> [Sakari Ailus: Backported to v4.9 stable]
> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> ---
> since v1 (as requested by Sasha):
>
> - Add my final SoB
> - Indicate specifically this is a backport
> - Remove the extra cc stable
Now queued up, thanks.
greg k-h
