6 May
2019
6 May
'19
8:53 a.m.
On Mon, Apr 29, 2019 at 03:08:23PM -0700, Chia-I Wu wrote:
This is motivated by having meaningful ftrace events, but it also fixes use cases where dma_fence_is_later is called, such as in sync_file_merge.
In other drivers, fence creation and cmdbuf submission normally happen atomically,
mutex_lock(); fence = dma_fence_create(..., ++timeline->seqno); submit_cmdbuf(); mutex_unlock();
and have no such issue. But in our driver, because most ioctls queue commands into ctrlq, we do not want to grab a lock. Instead, we set seqno to 0 when a fence is created, and update it when the command is finally queued and the seqno is known.
Series pushed to drm-misc-next.
thanks, Gerd