[PATCH 0/3] Fix uvcvideo revert leftovers

[PATCH 0/3] Fix uvcvideo revert leftovers

[Laurent Pinchart]

Hi Mauro,

Those three patches, for v3.8, fix leftovers of commit
ba68c8530a263dc4de440fa10bb20a1c5b9d4ff5 (Partly revert "[media] uvcvideo: Set
error_idx properly for extended controls API failures").

Hans, if you have time, could you please have a look at the patches from a
compliance point of view ? The G_EXT_CTRLS error_idx issue isn't fixed yet,
I'll send a patch for v3.9.

Laurent Pinchart (3):
  uvcvideo: Return -EACCES when trying to access a read/write-only
    control
  uvcvideo: Cleanup leftovers of partial revert
  uvcvideo: Set error_idx properly for S_EXT_CTRLS failures

 drivers/media/usb/uvc/uvc_ctrl.c |    4 +++-
 drivers/media/usb/uvc/uvc_v4l2.c |    6 ++----
 2 files changed, 5 insertions(+), 5 deletions(-)

-- 
Regards,

Laurent Pinchart

[PATCH 1/3] uvcvideo: Return -EACCES when trying to access a read/write-only control

[Laurent Pinchart]

Commit ba68c8530a263dc4de440fa10bb20a1c5b9d4ff5 (Partly revert "[media]
uvcvideo: Set error_idx properly for extended controls API failures")
also reverted commit 30ecb936cbcd83e3735625ac63e1b4466546f5fe
("uvcvideo: Return -EACCES when trying to access a read/write-only
control") by mistake. Fix it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 drivers/media/usb/uvc/uvc_ctrl.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 2bb7613..d5baab1 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1431,8 +1431,10 @@ int uvc_ctrl_set(struct uvc_video_chain *chain,
 	int ret;
 
 	ctrl = uvc_find_control(chain, xctrl->id, &mapping);
-	if (ctrl == NULL || (ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR) == 0)
+	if (ctrl == NULL)
 		return -EINVAL;
+	if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
+		return -EACCES;
 
 	/* Clamp out of range values. */
 	switch (mapping->v4l2_type) {
-- 
1.7.8.6

Re: [PATCH 1/3] uvcvideo: Return -EACCES when trying to access a read/write-only control

[Hans Verkuil]

On Fri January 11 2013 14:13:58 Laurent Pinchart wrote:
> Commit ba68c8530a263dc4de440fa10bb20a1c5b9d4ff5 (Partly revert "[media]
> uvcvideo: Set error_idx properly for extended controls API failures")
> also reverted commit 30ecb936cbcd83e3735625ac63e1b4466546f5fe
> ("uvcvideo: Return -EACCES when trying to access a read/write-only
> control") by mistake. Fix it.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

> ---
>  drivers/media/usb/uvc/uvc_ctrl.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index 2bb7613..d5baab1 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -1431,8 +1431,10 @@ int uvc_ctrl_set(struct uvc_video_chain *chain,
>  	int ret;
>  
>  	ctrl = uvc_find_control(chain, xctrl->id, &mapping);
> -	if (ctrl == NULL || (ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR) == 0)
> +	if (ctrl == NULL)
>  		return -EINVAL;
> +	if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
> +		return -EACCES;
>  
>  	/* Clamp out of range values. */
>  	switch (mapping->v4l2_type) {
> 

Re: [PATCH 1/3] uvcvideo: Return -EACCES when trying to access a read/write-only control

[Hans Verkuil]

On Fri January 11 2013 14:21:40 Hans Verkuil wrote:
> On Fri January 11 2013 14:13:58 Laurent Pinchart wrote:
> > Commit ba68c8530a263dc4de440fa10bb20a1c5b9d4ff5 (Partly revert "[media]
> > uvcvideo: Set error_idx properly for extended controls API failures")
> > also reverted commit 30ecb936cbcd83e3735625ac63e1b4466546f5fe
> > ("uvcvideo: Return -EACCES when trying to access a read/write-only
> > control") by mistake. Fix it.
> > 
> > Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
> Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

Actually, I need a clarification first: the code only checks for access to
a read-only control, but the patch title says: "Return -EACCES when trying
to access a read/write-only control", so either there is something missing
in the patch, or the patch title is wrong.

I suspect it is just the title that is wrong.

Regards,

	Hans

> 
> > ---
> >  drivers/media/usb/uvc/uvc_ctrl.c |    4 +++-
> >  1 files changed, 3 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> > index 2bb7613..d5baab1 100644
> > --- a/drivers/media/usb/uvc/uvc_ctrl.c
> > +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> > @@ -1431,8 +1431,10 @@ int uvc_ctrl_set(struct uvc_video_chain *chain,
> >  	int ret;
> >  
> >  	ctrl = uvc_find_control(chain, xctrl->id, &mapping);
> > -	if (ctrl == NULL || (ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR) == 0)
> > +	if (ctrl == NULL)
> >  		return -EINVAL;
> > +	if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR))
> > +		return -EACCES;
> >  
> >  	/* Clamp out of range values. */
> >  	switch (mapping->v4l2_type) {
> > 
> --
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> 

Re: [PATCH 1/3] uvcvideo: Return -EACCES when trying to access a read/write-only control

[Laurent Pinchart]

Hi Hans,

On Friday 11 January 2013 14:26:28 Hans Verkuil wrote:
> On Fri January 11 2013 14:21:40 Hans Verkuil wrote:
> > On Fri January 11 2013 14:13:58 Laurent Pinchart wrote:
> > > Commit ba68c8530a263dc4de440fa10bb20a1c5b9d4ff5 (Partly revert "[media]
> > > uvcvideo: Set error_idx properly for extended controls API failures")
> > > also reverted commit 30ecb936cbcd83e3735625ac63e1b4466546f5fe
> > > ("uvcvideo: Return -EACCES when trying to access a read/write-only
> > > control") by mistake. Fix it.
> > > 
> > > Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > 
> > Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
> 
> Actually, I need a clarification first: the code only checks for access to
> a read-only control, but the patch title says: "Return -EACCES when trying
> to access a read/write-only control", so either there is something missing
> in the patch, or the patch title is wrong.
> 
> I suspect it is just the title that is wrong.

Yes, the title is wrong. The original commit handled both, and 
ba68c8530a263dc4de440fa10bb20a1c5b9d4ff5 reverted only half of it.

I'll send a v2 with a fixed title.

-- 
Regards,

Laurent Pinchart

[PATCH 2/3] uvcvideo: Cleanup leftovers of partial revert

[Laurent Pinchart]

Commit ba68c8530a263dc4de440fa10bb20a1c5b9d4ff5 (Partly revert "[media]
uvcvideo: Set error_idx properly for extended controls API failures")
missed two modifications. Clean them up.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 drivers/media/usb/uvc/uvc_v4l2.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index f2ee8c6..5eb8989 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -657,8 +657,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 			ret = uvc_ctrl_get(chain, ctrl);
 			if (ret < 0) {
 				uvc_ctrl_rollback(handle);
-				ctrls->error_idx = ret == -ENOENT
-						 ? ctrls->count : i;
+				ctrls->error_idx = i;
 				return ret;
 			}
 		}
@@ -686,9 +685,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 			ret = uvc_ctrl_set(chain, ctrl);
 			if (ret < 0) {
 				uvc_ctrl_rollback(handle);
-				ctrls->error_idx = (ret == -ENOENT &&
-						    cmd == VIDIOC_S_EXT_CTRLS)
-						 ? ctrls->count : i;
+				ctrls->error_idx = i;
 				return ret;
 			}
 		}
-- 
1.7.8.6

Re: [PATCH 2/3] uvcvideo: Cleanup leftovers of partial revert

[Hans Verkuil]

On Fri January 11 2013 14:13:59 Laurent Pinchart wrote:
> Commit ba68c8530a263dc4de440fa10bb20a1c5b9d4ff5 (Partly revert "[media]
> uvcvideo: Set error_idx properly for extended controls API failures")
> missed two modifications. Clean them up.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

> ---
>  drivers/media/usb/uvc/uvc_v4l2.c |    7 ++-----
>  1 files changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index f2ee8c6..5eb8989 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -657,8 +657,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
>  			ret = uvc_ctrl_get(chain, ctrl);
>  			if (ret < 0) {
>  				uvc_ctrl_rollback(handle);
> -				ctrls->error_idx = ret == -ENOENT
> -						 ? ctrls->count : i;
> +				ctrls->error_idx = i;
>  				return ret;
>  			}
>  		}
> @@ -686,9 +685,7 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
>  			ret = uvc_ctrl_set(chain, ctrl);
>  			if (ret < 0) {
>  				uvc_ctrl_rollback(handle);
> -				ctrls->error_idx = (ret == -ENOENT &&
> -						    cmd == VIDIOC_S_EXT_CTRLS)
> -						 ? ctrls->count : i;
> +				ctrls->error_idx = i;
>  				return ret;
>  			}
>  		}
> 

[PATCH 3/3] uvcvideo: Set error_idx properly for S_EXT_CTRLS failures

[Laurent Pinchart]

The uvc_set_ctrl() calls don't write to the hardware. A failure at that
point thus leaves the device in a clean state, with no control modified.
Set the error_idx field to the count value to reflect that, as per the
V4L2 specification.

TRY_EXT_CTRLS is unchanged and the error_idx field must always be set to
the failed control index in that case.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
---
 drivers/media/usb/uvc/uvc_v4l2.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index 5eb8989..68d59b5 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -685,7 +685,8 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
 			ret = uvc_ctrl_set(chain, ctrl);
 			if (ret < 0) {
 				uvc_ctrl_rollback(handle);
-				ctrls->error_idx = i;
+				ctrls->error_idx = cmd == VIDIOC_S_EXT_CTRLS
+						 ? ctrls->count : i;
 				return ret;
 			}
 		}
-- 
1.7.8.6

Re: [PATCH 3/3] uvcvideo: Set error_idx properly for S_EXT_CTRLS failures

[Hans Verkuil]

On Fri January 11 2013 14:14:00 Laurent Pinchart wrote:
> The uvc_set_ctrl() calls don't write to the hardware. A failure at that
> point thus leaves the device in a clean state, with no control modified.
> Set the error_idx field to the count value to reflect that, as per the
> V4L2 specification.
> 
> TRY_EXT_CTRLS is unchanged and the error_idx field must always be set to
> the failed control index in that case.
> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>

Regards,

	Hans

> ---
>  drivers/media/usb/uvc/uvc_v4l2.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
> index 5eb8989..68d59b5 100644
> --- a/drivers/media/usb/uvc/uvc_v4l2.c
> +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> @@ -685,7 +685,8 @@ static long uvc_v4l2_do_ioctl(struct file *file, unsigned int cmd, void *arg)
>  			ret = uvc_ctrl_set(chain, ctrl);
>  			if (ret < 0) {
>  				uvc_ctrl_rollback(handle);
> -				ctrls->error_idx = i;
> +				ctrls->error_idx = cmd == VIDIOC_S_EXT_CTRLS
> +						 ? ctrls->count : i;
>  				return ret;
>  			}
>  		}
>