drm/syncobj: handle NULL fence in syncobj_eventfd_entry_func
[ Upstream commit 2aa6f5b0 ] During syncobj_eventfd_entry_func, dma_fence_chain_find_seqno may set the fence to NULL if the given seqno is signaled and a later seqno has already been submitted. In that case, the eventfd should be signaled immediately which currently does not happen. This is a similar issue to the one addressed by commit b19926d4 ("drm/syncobj: Deal with signalled fences in drm_syncobj_find_fence."). As a fix, if the return value of dma_fence_chain_find_seqno indicates success but it sets the fence to NULL, we will assign a stub fence to ensure the following code still signals the eventfd. v1 -> v2: assign a stub fence instead of signaling the eventfd Signed-off-by:Erik Kurzinger <ekurzinger@nvidia.com> Fixes: c7a47229 ("drm/syncobj: add IOCTL to register an eventfd") Signed-off-by:
Simon Ser <contact@emersion.fr> Link: https://patchwork.freedesktop.org/patch/msgid/20240221184527.37667-1-ekurzinger@nvidia.com Signed-off-by:
Sasha Levin <sashal@kernel.org>
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