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Subject[PATCH v10 15/21] media: uvcvideo: Set error_idx during ctrl_commit errors
Date
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>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
drivers/media/usb/uvc/uvc_ctrl.c | 42 ++++++++++++++++++++++++++------
drivers/media/usb/uvc/uvc_v4l2.c | 2 +-
drivers/media/usb/uvc/uvcvideo.h | 10 +++-----
3 files changed, 40 insertions(+), 14 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 18c315b52ef5..dd6ebcc7344a 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -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;
}
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index a3ee1dc003fc..8d8b12a4db34 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -1088,7 +1088,7 @@ 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);
}
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 4aa78591d9b0..2e5366143b81 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -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);
--
2.32.0.288.g62a8d224e6-goog
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