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Commit 71fcbc47 authored by Dave Stevenson's avatar Dave Stevenson Committed by Greg Kroah-Hartman
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staging: bcm2835-camera: Remove bulk_mutex as it is not required 



There is no requirement to serialise bulk transfers as that is all
done in VCHI, and if a second MMAL_MSG_TYPE_BUFFER_TO_HOST happened
before the VCHI_CALLBACK_BULK_RECEIVED, then the service_callback
thread is deadlocked.

Remove the bulk_mutex so that multiple receives can be scheduled at a
time.

Signed-off-by: default avatarDave Stevenson <dave.stevenson@raspberrypi.org>
Signed-off-by: default avatarEric Anholt <eric@anholt.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 96b7e81a

drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c

+1 −47
Original line number Diff line number Diff line
@@ -162,9 +162,6 @@ struct vchiq_mmal_instance { 
	/* ensure serialised access to service */

	struct mutex vchiq_mutex;



	/* ensure serialised access to bulk operations */

	struct mutex bulk_mutex;



	/* vmalloc page to receive scratch bulk xfers into */

	void *bulk_scratch;
@@ -332,13 +329,6 @@ static int bulk_receive(struct vchiq_mmal_instance *instance, 
	unsigned long flags = 0;

	int ret;



	/* bulk mutex stops other bulk operations while we have a

	 * receive in progress - released in callback

	 */

	ret = mutex_lock_interruptible(&instance->bulk_mutex);

	if (ret != 0)

		return ret;



	rd_len = msg->u.buffer_from_host.buffer_header.length;



	/* take buffer from queue */
@@ -357,8 +347,6 @@ static int bulk_receive(struct vchiq_mmal_instance *instance, 
		 * waiting bulk receive?

		 */



		mutex_unlock(&instance->bulk_mutex);



		return -EINVAL;

	}
@@ -399,11 +387,6 @@ static int bulk_receive(struct vchiq_mmal_instance *instance, 


	vchi_service_release(instance->handle);



	if (ret != 0) {

		/* callback will not be clearing the mutex */

		mutex_unlock(&instance->bulk_mutex);

	}



	return ret;

}
@@ -413,13 +396,6 @@ static int dummy_bulk_receive(struct vchiq_mmal_instance *instance, 
{

	int ret;



	/* bulk mutex stops other bulk operations while we have a

	 * receive in progress - released in callback

	 */

	ret = mutex_lock_interruptible(&instance->bulk_mutex);

	if (ret != 0)

		return ret;



	/* zero length indicates this was a dummy transfer */

	msg_context->u.bulk.buffer_used = 0;
@@ -435,11 +411,6 @@ static int dummy_bulk_receive(struct vchiq_mmal_instance *instance, 


	vchi_service_release(instance->handle);



	if (ret != 0) {

		/* callback will not be clearing the mutex */

		mutex_unlock(&instance->bulk_mutex);

	}



	return ret;

}
@@ -494,18 +465,11 @@ buffer_from_host(struct vchiq_mmal_instance *instance, 


	pr_debug("instance:%p buffer:%p\n", instance->handle, buf);



	/* bulk mutex stops other bulk operations while we

	 * have a receive in progress

	 */

	if (mutex_lock_interruptible(&instance->bulk_mutex))

		return -EINTR;



	/* get context */

	if (!buf->msg_context) {

		pr_err("%s: msg_context not allocated, buf %p\n", __func__,

		       buf);

		ret = -EINVAL;

		goto unlock;

		return -EINVAL;

	}

	msg_context = buf->msg_context;
@@ -559,9 +523,6 @@ buffer_from_host(struct vchiq_mmal_instance *instance, 


	vchi_service_release(instance->handle);



unlock:

	mutex_unlock(&instance->bulk_mutex);



	return ret;

}
@@ -685,9 +646,6 @@ static void buffer_to_host_cb(struct vchiq_mmal_instance *instance, 
static void bulk_receive_cb(struct vchiq_mmal_instance *instance,

			    struct mmal_msg_context *msg_context)

{

	/* bulk receive operation complete */

	mutex_unlock(&msg_context->u.bulk.instance->bulk_mutex);



	/* replace the buffer header */

	port_buffer_from_host(msg_context->u.bulk.instance,

			      msg_context->u.bulk.port);
@@ -703,9 +661,6 @@ static void bulk_abort_cb(struct vchiq_mmal_instance *instance, 
{

	pr_err("%s: bulk ABORTED msg_context:%p\n", __func__, msg_context);



	/* bulk receive operation complete */

	mutex_unlock(&msg_context->u.bulk.instance->bulk_mutex);



	/* replace the buffer header */

	port_buffer_from_host(msg_context->u.bulk.instance,

			      msg_context->u.bulk.port);
@@ -2042,7 +1997,6 @@ int vchiq_mmal_init(struct vchiq_mmal_instance **out_instance) 
		return -ENOMEM;



	mutex_init(&instance->vchiq_mutex);

	mutex_init(&instance->bulk_mutex);



	instance->bulk_scratch = vmalloc(PAGE_SIZE);