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media: uvcvideo: Set error_idx during ctrl_commit errors 

If we have an error setting a control, return the affected control in
the error_idx field.

Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Ricardo Ribalda 2021-06-18 14:29:17 +02:00 committed by Mauro Carvalho Chehab
parent ee929d5a10
commit 6350d6a4ed
3 changed files with 40 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/media/usb/uvc/uvc_ctrl.c
View File

@ -1582,7 +1582,7 @@ int uvc_ctrl_begin(struct uvc_video_chain *chain)
}
static int uvc_ctrl_commit_entity(struct uvc_device *dev,
struct uvc_entity *entity, int rollback)
struct uvc_entity *entity, int rollback, struct uvc_control **err_ctrl)
{
struct uvc_control *ctrl;
unsigned int i;
@ -1624,31 +1624,59 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev,
ctrl->dirty = 0;
if (ret < 0)
if (ret < 0) {
if (err_ctrl)
*err_ctrl = ctrl;
return ret;
}
}
return 0;
}
static int uvc_ctrl_find_ctrl_idx(struct uvc_entity *entity,
struct v4l2_ext_controls *ctrls,
struct uvc_control *uvc_control)
{
struct uvc_control_mapping *mapping;
struct uvc_control *ctrl_found;
unsigned int i;
if (!entity)
return ctrls->count;
for (i = 0; i < ctrls->count; i++) {
__uvc_find_control(entity, ctrls->controls[i].id, &mapping,
&ctrl_found, 0);
if (uvc_control == ctrl_found)
return i;
}
return ctrls->count;
}
int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
const struct v4l2_ext_control *xctrls,
unsigned int xctrls_count)
struct v4l2_ext_controls *ctrls)
{
struct uvc_video_chain *chain = handle->chain;
struct uvc_control *err_ctrl;
struct uvc_entity *entity;
int ret = 0;
/* Find the control. */
list_for_each_entry(entity, &chain->entities, chain) {
ret = uvc_ctrl_commit_entity(chain->dev, entity, rollback);
ret = uvc_ctrl_commit_entity(chain->dev, entity, rollback,
&err_ctrl);
if (ret < 0)
goto done;
}
if (!rollback)
uvc_ctrl_send_events(handle, xctrls, xctrls_count);
uvc_ctrl_send_events(handle, ctrls->controls, ctrls->count);
done:
if (ret < 0 && ctrls)
ctrls->error_idx = uvc_ctrl_find_ctrl_idx(entity, ctrls,
err_ctrl);
mutex_unlock(&chain->ctrl_mutex);
return ret;
}
@ -2106,7 +2134,7 @@ int uvc_ctrl_restore_values(struct uvc_device *dev)
ctrl->dirty = 1;
}
ret = uvc_ctrl_commit_entity(dev, entity, 0);
ret = uvc_ctrl_commit_entity(dev, entity, 0, NULL);
if (ret < 0)
return ret;
}

2
drivers/media/usb/uvc/uvc_v4l2.c
View File

@ -1100,7 +1100,7 @@ static int uvc_ioctl_s_try_ext_ctrls(struct uvc_fh *handle,
ctrls->error_idx = 0;
if (ioctl == VIDIOC_S_EXT_CTRLS)
return uvc_ctrl_commit(handle, ctrls->controls, ctrls->count);
return uvc_ctrl_commit(handle, ctrls);
else
return uvc_ctrl_rollback(handle);
}

10
drivers/media/usb/uvc/uvcvideo.h
View File

@ -886,17 +886,15 @@ void uvc_ctrl_status_event(struct uvc_video_chain *chain,
int uvc_ctrl_begin(struct uvc_video_chain *chain);
int __uvc_ctrl_commit(struct uvc_fh *handle, int rollback,
const struct v4l2_ext_control *xctrls,
unsigned int xctrls_count);
struct v4l2_ext_controls *ctrls);
static inline int uvc_ctrl_commit(struct uvc_fh *handle,
const struct v4l2_ext_control *xctrls,
unsigned int xctrls_count)
struct v4l2_ext_controls *ctrls)
{
return __uvc_ctrl_commit(handle, 0, xctrls, xctrls_count);
return __uvc_ctrl_commit(handle, 0, ctrls);
}
static inline int uvc_ctrl_rollback(struct uvc_fh *handle)
{
return __uvc_ctrl_commit(handle, 1, NULL, 0);
return __uvc_ctrl_commit(handle, 1, NULL);
}
int uvc_ctrl_get(struct uvc_video_chain *chain, struct v4l2_ext_control *xctrl);