diff options
| author |   Ben Skeggs <bskeggs@redhat.com> | 2010-10-06 16:16:59 +1000 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2010-12-03 15:05:18 +1000 |
| commit | cff5c1332486ced8ff4180e957e04983cb72a39e (patch) | |
| tree | ec1f6687156277632aef96693c1b8eca0c022b7c /drivers/gpu/drm/nouveau/nouveau_fence.c | |
| parent | drm/nouveau: add per-channel mutex, use to lock access to drm's channel (diff) | |
| download | linux-dev-cff5c1332486ced8ff4180e957e04983cb72a39e.tar.xz linux-dev-cff5c1332486ced8ff4180e957e04983cb72a39e.zip | |
drm/nouveau: add more fine-grained locking to channel list + structures
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_fence.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_fence.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c index ab1bbfbf266e..42694b122eef 100644 --- a/drivers/gpu/drm/nouveau/nouveau_fence.c +++ b/drivers/gpu/drm/nouveau/nouveau_fence.c @@ -393,8 +393,18 @@ nouveau_fence_sync(struct nouveau_fence *fence, return nouveau_fence_wait(fence, NULL, false, false); } + /* try to take wchan's mutex, if we can't take it right away + * we have to fallback to software sync to prevent locking + * order issues + */ + if (!mutex_trylock(&wchan->mutex)) { + free_semaphore(&sema->ref); + return nouveau_fence_wait(fence, NULL, false, false); + } + /* Make wchan wait until it gets signalled */ ret = emit_semaphore(wchan, NV_SW_SEMAPHORE_ACQUIRE, sema); + mutex_unlock(&wchan->mutex); if (ret) goto out; |