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gstv4l2bufferpool: lock flush_stop against regular qbuf

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These can be called from different threads and both manipulate the
pool->buffers array. Lock them properly and let flush_stop move the
array contents into a temporary array on the stack to avoid having
to call release_buffer under the object lock.

https://bugzilla.gnome.org/show_bug.cgi?id=775015
This commit is contained in:
Philipp Zabel 2016-07-28 18:51:24 +02:00 committed by Nicolas Dufresne
parent 6b5807654b
commit 86f243bb12
1 changed files with 13 additions and 8 deletions
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21
sys/v4l2/gstv4l2bufferpool.c
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@ -940,6 +940,7 @@ gst_v4l2_buffer_pool_flush_stop (GstBufferPool * bpool)
{
GstV4l2BufferPool *pool = GST_V4L2_BUFFER_POOL (bpool);
GstV4l2Object *obj = pool->obj;
GstBuffer *buffers[VIDEO_MAX_FRAME];
gint i;
GST_DEBUG_OBJECT (pool, "stop flushing");
@ -951,7 +952,12 @@ gst_v4l2_buffer_pool_flush_stop (GstBufferPool * bpool)
if (pool->other_pool)
gst_buffer_pool_set_flushing (pool->other_pool, FALSE);
GST_OBJECT_LOCK (pool);
gst_v4l2_buffer_pool_streamoff (pool);
/* Remember buffers to re-enqueue */
memcpy(buffers, pool->buffers, sizeof(buffers));
memset(pool->buffers, 0, sizeof(pool->buffers));
GST_OBJECT_UNLOCK (pool);
/* Reset our state */
switch (obj->mode) {
@ -964,11 +970,9 @@ gst_v4l2_buffer_pool_flush_stop (GstBufferPool * bpool)
{
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
/* Re-enqueue buffers */
if (pool->buffers[i]) {
if (buffers[i]) {
GstBufferPool *bpool = (GstBufferPool *) pool;
GstBuffer *buffer = pool->buffers[i];
pool->buffers[i] = NULL;
GstBuffer *buffer = buffers[i];
/* Remove qdata, this will unmap any map data in
* userptr/dmabuf-import */
@ -1077,9 +1081,6 @@ gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstBuffer * buf)
GST_LOG_OBJECT (pool, "queuing buffer %i", index);
g_atomic_int_inc (&pool->num_queued);
pool->buffers[index] = buf;
if (V4L2_TYPE_IS_OUTPUT (obj->type)) {
enum v4l2_field field;
@ -1107,10 +1108,13 @@ gst_v4l2_buffer_pool_qbuf (GstV4l2BufferPool * pool, GstBuffer * buf)
GST_TIME_TO_TIMEVAL (timestamp, group->buffer.timestamp);
}
GST_OBJECT_LOCK (pool);
g_atomic_int_inc (&pool->num_queued);
pool->buffers[index] = buf;
if (!gst_v4l2_allocator_qbuf (pool->vallocator, group))
goto queue_failed;
GST_OBJECT_LOCK (pool);
pool->empty = FALSE;
g_cond_signal (&pool->empty_cond);
GST_OBJECT_UNLOCK (pool);
@ -1129,6 +1133,7 @@ queue_failed:
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_TAG_MEMORY);
g_atomic_int_add (&pool->num_queued, -1);
pool->buffers[index] = NULL;
GST_OBJECT_UNLOCK (pool);
return GST_FLOW_ERROR;
}
}