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drm/nouveau: Make fences take a weak channel reference.

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Fences didn't increment the channel reference count, and the fenced
channel could go away at any time. Fixes a potential race in
nouveau_fence_update().

Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Francisco Jerez 2010-10-18 03:56:14 +02:00 committed by Ben Skeggs
parent f091a3d403
commit 2a6789ae5e
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/nouveau/nouveau_fence.c
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@ -64,6 +64,7 @@ nouveau_fence_del(struct kref *ref)
struct nouveau_fence *fence =
container_of(ref, struct nouveau_fence, refcount);
nouveau_channel_ref(NULL, &fence->channel);
kfree(fence);
}
@ -113,7 +114,7 @@ nouveau_fence_new(struct nouveau_channel *chan, struct nouveau_fence **pfence,
if (!fence)
return -ENOMEM;
kref_init(&fence->refcount);
fence->channel = chan;
nouveau_channel_ref(chan, &fence->channel);
if (emit)
ret = nouveau_fence_emit(fence);