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| author | Zbigniew Kempczyński <[email protected]> | 2025-08-20 08:39:04 +0000 |
|---|---|---|
| committer | Rodrigo Vivi <[email protected]> | 2025-08-26 14:12:11 +0000 |
| commit | 04e1f683cd28dc9407b238543871a6e09a570dc0 (patch) | |
| tree | 814b445ebeb01ac21b4a200cf0592453046a6e26 /drivers/gpu/drm/omapdrm/omap_fbdev.c | |
| parent | Linux 6.17-rc3 (diff) | |
| download | kernel-04e1f683cd28dc9407b238543871a6e09a570dc0.tar.gz kernel-04e1f683cd28dc9407b238543871a6e09a570dc0.zip | |
drm/xe/xe_sync: avoid race during ufence signaling
Marking ufence as signalled after copy_to_user() is too late.
Worker thread which signals ufence by memory write might be raced
with another userspace vm-bind call. In map/unmap scenario unmap
may still see ufence is not signalled causing -EBUSY. Change the
order of marking / write to user-fence fixes this issue.
Fixes: 977e5b82e090 ("drm/xe: Expose user fence from xe_sync_entry")
Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/5536
Signed-off-by: Zbigniew Kempczyński <[email protected]>
Cc: Matthew Brost <[email protected]>
Cc: Matthew Auld <[email protected]>
Reviewed-by: Matthew Brost <[email protected]>
Signed-off-by: Matthew Brost <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
(cherry picked from commit 8ae04fe9ffc93d6bc3bc63ac08375427d69cee06)
Signed-off-by: Rodrigo Vivi <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/omapdrm/omap_fbdev.c')
0 files changed, 0 insertions, 0 deletions