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Commit a2cc81d3 authored by Michael Grzeschik's avatar Michael Grzeschik Committed by Felipe Balbi
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usb: gadget: uvc: Implement videobuf2 .wait_prepare and .wait_finish operations 



Those optional operations are used to release and reacquire the queue
lock when videobuf2 needs to perform operations that sleep for a long
time, such as waiting for a buffer to be complete. Implement them to
avoid blocking qbuf or streamoff calls when a dqbuf is in progress.

Signed-off-by: default avatarMichael Grzeschik <m.grzeschik@pengutronix.de>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 81fbf101

drivers/usb/gadget/uvc_queue.c

+16 −0
Original line number Diff line number Diff line
@@ -103,10 +103,26 @@ static void uvc_buffer_queue(struct vb2_buffer *vb) 
	spin_unlock_irqrestore(&queue->irqlock, flags);

}



static void uvc_wait_prepare(struct vb2_queue *vq)

{

	struct uvc_video_queue *queue = vb2_get_drv_priv(vq);



	mutex_unlock(&queue->mutex);

}



static void uvc_wait_finish(struct vb2_queue *vq)

{

	struct uvc_video_queue *queue = vb2_get_drv_priv(vq);



	mutex_lock(&queue->mutex);

}



static struct vb2_ops uvc_queue_qops = {

	.queue_setup = uvc_queue_setup,

	.buf_prepare = uvc_buffer_prepare,

	.buf_queue = uvc_buffer_queue,

	.wait_prepare = uvc_wait_prepare,

	.wait_finish = uvc_wait_finish,

};



static int uvc_queue_init(struct uvc_video_queue *queue,