Hi Laurent, Thanks for the review. On Thu, Nov 27, 2014 at 9:32 PM, Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> wrote: > Hi Prabhakar, [Snip] >> >> + queue->queue.lock = &queue->mutex; > > I'm a bit concerned that this would introduce future breakages. Setting the > queue.lock pointer enables locking in all vb2_fop_* and vb2_ops_wait_* > functions. The uvcvideo driver isn't ready for that, but doesn't use the > vb2_fop_* functions yet, so that's not an issue. However, in the future, > videobuf2 might use the lock in more places, including functions used by the > uvcvideo driver. This could then cause breakages. > Even if in future if videobuf2 uses this lock it would be in helpers mostly, so any way it doesn’t harm :) > It would be better to completely convert the uvcvideo driver to the vb2_fop_* > functions if we want to use vb2_ops_*. I'm not sure how complex that would be > though, and whether it would be possible while still keeping the fine-grained > locking implemented by the uvcvideo driver. Do you think it should be > attempted ? > mmap & poll should be fairly simple, looks like open & release cannot be dropped as it does some usb_autopm_get/put_interface() calls which I am not aware of. Thanks, --Prabhakar Lad >> ret = vb2_queue_init(&queue->queue); >> if (ret) >> return ret; > > -- > Regards, > > Laurent Pinchart > -- 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
