The only thread safe way to stop the status handler is with uvc_status.
Let's remove all the code paths partially stopping uvc_status.
Reviewed-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
---
drivers/media/usb/uvc/uvc_ctrl.c | 4 ----
drivers/media/usb/uvc/uvc_driver.c | 2 +-
drivers/media/usb/uvc/uvc_status.c | 8 ++++----
drivers/media/usb/uvc/uvc_v4l2.c | 2 +-
drivers/media/usb/uvc/uvcvideo.h | 2 +-
5 files changed, 7 insertions(+), 11 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index e59a463c2761..8e22a07e3e7b 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -2765,10 +2765,6 @@ void uvc_ctrl_cleanup_device(struct uvc_device *dev)
struct uvc_entity *entity;
unsigned int i;
- /* Can be uninitialized if we are aborting on probe error. */
- if (dev->async_ctrl.work.func)
- cancel_work_sync(&dev->async_ctrl.work);
-
/* Free controls and control mappings for all entities. */
list_for_each_entry(entity, &dev->entities, list) {
for (i = 0; i < entity->ncontrols; ++i) {
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index ded2cb6ce14f..d5dbf2644272 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -2282,7 +2282,7 @@ static int uvc_suspend(struct usb_interface *intf, pm_message_t message)
UVC_SC_VIDEOCONTROL) {
mutex_lock(&dev->lock);
if (dev->users)
- uvc_status_stop(dev);
+ uvc_status_stop(dev, true);
mutex_unlock(&dev->lock);
return 0;
}
diff --git a/drivers/media/usb/uvc/uvc_status.c b/drivers/media/usb/uvc/uvc_status.c
index a78a88c710e2..9c5da1244999 100644
--- a/drivers/media/usb/uvc/uvc_status.c
+++ b/drivers/media/usb/uvc/uvc_status.c
@@ -292,7 +292,7 @@ int uvc_status_init(struct uvc_device *dev)
void uvc_status_unregister(struct uvc_device *dev)
{
- usb_kill_urb(dev->int_urb);
+ uvc_status_stop(dev, false);
uvc_input_unregister(dev);
}
@@ -310,7 +310,7 @@ int uvc_status_start(struct uvc_device *dev, gfp_t flags)
return usb_submit_urb(dev->int_urb, flags);
}
-void uvc_status_stop(struct uvc_device *dev)
+void uvc_status_stop(struct uvc_device *dev, bool run_async_work)
{
struct uvc_ctrl_work *w = &dev->async_ctrl;
@@ -326,7 +326,7 @@ void uvc_status_stop(struct uvc_device *dev)
* Cancel any pending asynchronous work. If any status event was queued,
* process it synchronously.
*/
- if (cancel_work_sync(&w->work))
+ if (cancel_work_sync(&w->work) && run_async_work)
uvc_ctrl_status_event(w->chain, w->ctrl, w->data);
/* Kill the urb. */
@@ -338,7 +338,7 @@ void uvc_status_stop(struct uvc_device *dev)
* cancelled before returning or it could then race with a future
* uvc_status_start() call.
*/
- if (cancel_work_sync(&w->work))
+ if (cancel_work_sync(&w->work) && run_async_work)
uvc_ctrl_status_event(w->chain, w->ctrl, w->data);
/*
diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c
index f4988f03640a..f90206263ff4 100644
--- a/drivers/media/usb/uvc/uvc_v4l2.c
+++ b/drivers/media/usb/uvc/uvc_v4l2.c
@@ -672,7 +672,7 @@ static int uvc_v4l2_release(struct file *file)
mutex_lock(&stream->dev->lock);
if (--stream->dev->users == 0)
- uvc_status_stop(stream->dev);
+ uvc_status_stop(stream->dev, false);
mutex_unlock(&stream->dev->lock);
usb_autopm_put_interface(stream->dev->intf);
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 6fb0a78b1b00..ba8f8c1f2c83 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -745,7 +745,7 @@ int uvc_status_init(struct uvc_device *dev);
void uvc_status_unregister(struct uvc_device *dev);
void uvc_status_cleanup(struct uvc_device *dev);
int uvc_status_start(struct uvc_device *dev, gfp_t flags);
-void uvc_status_stop(struct uvc_device *dev);
+void uvc_status_stop(struct uvc_device *dev, bool run_async_work);
/* Controls */
extern const struct uvc_control_mapping uvc_ctrl_power_line_mapping_limited;
--
2.43.0.rc1.413.gea7ed67945-goog
