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Subject: [media] vb2: fix videobuf2-core.h comments Author: Hans Verkuil <hverk...@xs4all.nl> Date: Wed Jul 23 03:17:06 2014 -0300 A lot of work was done in vb2 to regulate how drivers and the vb2 core handle buffer ownership, but inexplicably the videobuf2-core.h comments were never updated. Do so now. The same was true for the replacement of the -ENOBUFS mechanism by the min_buffers_needed field. Signed-off-by: Hans Verkuil <hans.verk...@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.che...@samsung.com> include/media/videobuf2-core.h | 16 ++++++++++------ 1 files changed, 10 insertions(+), 6 deletions(-) --- http://git.linuxtv.org/media_tree.git?a=commitdiff;h=ccf58cb4eac050ebe777cfcb209bc53d58f5fd79 diff --git a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index 1a262ae..fc910a6 100644 --- a/include/media/videobuf2-core.h +++ b/include/media/videobuf2-core.h @@ -294,15 +294,19 @@ struct vb2_buffer { * of already queued buffers in count parameter; driver * can return an error if hardware fails, in that case all * buffers that have been already given by the @buf_queue - * callback are invalidated. - * If there were not enough queued buffers to start - * streaming, then this callback returns -ENOBUFS, and the - * vb2 core will retry calling @start_streaming when a new - * buffer is queued. + * callback are to be returned by the driver by calling + * @vb2_buffer_done(VB2_BUF_STATE_DEQUEUED). + * If you need a minimum number of buffers before you can + * start streaming, then set @min_buffers_needed in the + * vb2_queue structure. If that is non-zero then + * start_streaming won't be called until at least that + * many buffers have been queued up by userspace. * @stop_streaming: called when 'streaming' state must be disabled; driver * should stop any DMA transactions or wait until they * finish and give back all buffers it got from buf_queue() - * callback; may use vb2_wait_for_all_buffers() function + * callback by calling @vb2_buffer_done() with either + * VB2_BUF_STATE_DONE or VB2_BUF_STATE_ERROR; may use + * vb2_wait_for_all_buffers() function * @buf_queue: passes buffer vb to the driver; driver may start * hardware operation on this buffer; driver should give * the buffer back by calling vb2_buffer_done() function; _______________________________________________ linuxtv-commits mailing list linuxtv-commits@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
