I know that patch is a little bit stupid, but at least it seems to kill that "INFO: possible circular locking dependency detected" / DEADLOCK warning reported by lockdep. Somehow this kind of warnings are very annoying when you don't know it is a "feature". Like what happens to me; I made my first V4L2 driver and then enabled all kind of Kernel debugs to see if there is possible issues. And kaboom, that jumped to out. It took really a some time to figure it is not my module, but coming from v4l core layers. Antti Palosaari (1): v4l: disable lockdep on vb2_fop_mmap() drivers/media/v4l2-core/videobuf2-core.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) -- 1.8.4.2 -- 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