static void uvc_stop_streaming(struct vb2_queue *vq)
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
struct uvc_streaming *stream = uvc_queue_to_stream(queue);
unsigned long flags;
uvc_video_enable(stream, 0);
spin_lock_irqsave(&queue->irqlock, flags);
uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
spin_unlock_irqrestore(&queue->irqlock, flags);
}
/*
* Cancel the video buffers queue.
*
* Cancelling the queue marks all buffers on the irq queue as erroneous,
* wakes them up and removes them from the queue.
*
* If the disconnect parameter is set, further calls to uvc_queue_buffer will
* fail with -ENODEV.
*
* This function acquires the irq spinlock and can be called from interrupt
* context.
*/
void uvc_queue_cancel(struct uvc_video_queue *queue, int disconnect)
{
unsigned long flags;
spin_lock_irqsave(&queue->irqlock, flags);
uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
/* This must be protected by the irqlock spinlock to avoid race
* conditions between uvc_buffer_queue and the disconnection event that
* could result in an interruptible wait in uvc_dequeue_buffer. Do not
* blindly replace this logic by checking for the UVC_QUEUE_DISCONNECTED
* state outside the queue code.
*/
if (disconnect)
queue->flags |= UVC_QUEUE_DISCONNECTED;
spin_unlock_irqrestore(&queue->irqlock, flags);
}
static int uvc_start_streaming(struct vb2_queue *vq, unsigned int count)
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
struct uvc_streaming *stream = uvc_queue_to_stream(queue);
unsigned long flags;
int ret;
queue->buf_used = 0;
ret = uvc_video_enable(stream, 1);
if (ret == 0)
return 0;
spin_lock_irqsave(&queue->irqlock, flags);
uvc_queue_return_buffers(queue, UVC_BUF_STATE_QUEUED);
spin_unlock_irqrestore(&queue->irqlock, flags);
return ret;
}
static void uvc_stop_streaming(struct vb2_queue *vq)
{
struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
struct uvc_streaming *stream = uvc_queue_to_stream(queue);
/* Prevent new buffers coming in. */
spin_lock_irq(&queue->irqlock);
queue->flags |= UVC_QUEUE_STOPPING;
spin_unlock_irq(&queue->irqlock);
/*
* All pending work should be completed before disabling the stream, as
* all URBs will be free'd during uvc_video_enable(s, 0).
*/
flush_workqueue(stream->async_wq);
if (vq->type != V4L2_BUF_TYPE_META_CAPTURE)
uvc_video_enable(uvc_queue_to_stream(queue), 0);
spin_lock_irq(&queue->irqlock);
uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
queue->flags &= ~UVC_QUEUE_STOPPING;
spin_unlock_irq(&queue->irqlock);
}
