Hi Javi,
On Wed, Nov 23, 2016 at 10:09:57AM +0000, Javi Merino wrote:
> In asd's configured with V4L2_ASYNC_MATCH_OF, if the v4l2 subdev is in
> a devicetree overlay, its of_node pointer will be different each time
> the overlay is applied. We are not interested in matching the
> pointer, what we want to match is that the path is the one we are
> expecting. Change to use of_node_cmp() so that we continue matching
> after the overlay has been removed and reapplied.
>
> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
> Cc: Javier Martinez Canillas <javier@xxxxxxxxxxxxxxx>
> Cc: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> Signed-off-by: Javi Merino <javi.merino@xxxxxxxxxx>
> ---
> Hi,
>
> I feel it is a bit of a hack, but I couldn't think of anything better.
> I'm ccing devicetree@ and Pantelis because there may be a simpler
> solution.
First I have to admit that I'm not an expert when it comes to DT overlays.
That said, my understanding is that the sub-device and the async sub-device
are supposed to point to the exactly same DT node. I wonder if there's
actually anything wrong in the current code.
If the overlay has changed between probing the driver for the async notifier
and the async sub-device, there should be no match here, should there? The
two nodes actually point to a node in a different overlay in that case.
>
> drivers/media/v4l2-core/v4l2-async.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-async.c b/drivers/media/v4l2-core/v4l2-async.c
> index 5bada20..d33a17c 100644
> --- a/drivers/media/v4l2-core/v4l2-async.c
> +++ b/drivers/media/v4l2-core/v4l2-async.c
> @@ -42,7 +42,8 @@ static bool match_devname(struct v4l2_subdev *sd,
>
> static bool match_of(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
> {
> - return sd->of_node == asd->match.of.node;
> + return !of_node_cmp(of_node_full_name(sd->of_node),
> + of_node_full_name(asd->match.of.node));
> }
>
> static bool match_custom(struct v4l2_subdev *sd, struct v4l2_async_subdev *asd)
--
Kind regards,
Sakari Ailus
e-mail: sakari.ailus@xxxxxx XMPP: sailus@xxxxxxxxxxxxxx
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