As poll behavior described in following link, polling needs to just return if already some buffer is in done list. Link: http://www.spinics.net/lists/linux-media/msg34759.html But in current vb2 and v4l2_m2m, poll function always calls poll_wait(), so it needs to wait until next vb2_buffer_done() or queue is cancelled. So I add check routine for done_list before calling poll_wait(). But I'm not sure that locking for done_lock of queue is also needed in this case or not because done_list of queue is checked without locking in some other parts of vb2. Seung-Woo Kim (2): media: vb2: return for polling if a buffer is available media: v4l2-mem2mem: return for polling if a buffer is available drivers/media/v4l2-core/v4l2-mem2mem.c | 6 ++++-- drivers/media/v4l2-core/videobuf2-core.c | 3 ++- 2 files changed, 6 insertions(+), 3 deletions(-) -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
