Am 10.04.25 um 11:24 schrieb Philipp Stanner:

nouveau_fence_done() contains an if-branch which checks for the existence of either of two fence backend ops. Those two are the only backend ops existing in Nouveau, however; and at least one backend ops must be in use for the entire driver to be able to work. The if branch is, therefore, surplus.

Remove the if-branch.

What happens here is that nouveau checks if the fence comes from itself or some external source.

So when you remove that check you potentially illegally uses nouveau_fctx() on a non-nouveau fence.

Regards, Christian.

Signed-off-by: Philipp Stanner phasta@kernel.org

drivers/gpu/drm/nouveau/nouveau_fence.c | 24 +++++++++++------------- 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c index 33535987d8ed..db6f4494405c 100644 --- a/drivers/gpu/drm/nouveau/nouveau_fence.c +++ b/drivers/gpu/drm/nouveau/nouveau_fence.c @@ -259,21 +259,19 @@ nouveau_fence_emit(struct nouveau_fence *fence) bool nouveau_fence_done(struct nouveau_fence *fence) {

• if (fence->base.ops == &nouveau_fence_ops_legacy ||

•    fence->base.ops == &nouveau_fence_ops_uevent) {
  

• struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
  

• struct nouveau_channel *chan;
  

• unsigned long flags;
  

• struct nouveau_fence_chan *fctx = nouveau_fctx(fence);
• struct nouveau_channel *chan;
• unsigned long flags;

• if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))
  

• 	return true;
  

• if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags))

• return true;
  

• spin_lock_irqsave(&fctx->lock, flags);
• chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
• if (chan && nouveau_fence_update(chan, fctx))

• nvif_event_block(&fctx->event);
  

• spin_unlock_irqrestore(&fctx->lock, flags);

• spin_lock_irqsave(&fctx->lock, flags);
  

• chan = rcu_dereference_protected(fence->channel, lockdep_is_held(&fctx->lock));
  

• if (chan && nouveau_fence_update(chan, fctx))
  

• 	nvif_event_block(&fctx->event);
  

• spin_unlock_irqrestore(&fctx->lock, flags);
  

• } return test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->base.flags);

}