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[ Upstream commit 2aa6f5b0fd052e363bb9d4b547189f0bf6b3d6d3 ] 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 commitb19926d4f3("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:c7a4722971("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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.