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drm/omap: EBUSY status handling in omap_gem_fault()

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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 e79e0fe380 ("drm/i915: EBUSY status
handling added to i915_gem_fault()").

Signed-off-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
This commit is contained in:
Rob Clark 2013-10-20 12:07:42 -04:00 • committed by Tomi Valkeinen
parent be4f235c43
commit e1d4ee0f2b
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/omapdrm/omap_gem.c
View file

@ -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;