From: Rob Clark <robdclark@xxxxxxxxx>
Subsequent threads returning EBUSY from vm_insert_pfn() was not
handled correctly. As a result concurrent access from new threads
to mmapped data caused SIGBUS.
See e79e0fe380847493266fba557217e2773c61bd1b ("drm/i915: EBUSY status
handling added to i915_gem_fault()").
Signed-off-by: Rob Clark <robdclark@xxxxxxxxx>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
---
drivers/gpu/drm/omapdrm/omap_gem.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c
index baa714c8ec70..9ac30560e9b1 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem.c
@@ -578,6 +578,11 @@ fail:
case 0:
case -ERESTARTSYS:
case -EINTR:
+ case -EBUSY:
+ /*
+ * EBUSY is ok: this just means that another thread
+ * already did the job.
+ */
return VM_FAULT_NOPAGE;
case -ENOMEM:
return VM_FAULT_OOM;
--
2.5.0
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