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drm/msm: EBUSY status handling in msm_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 e79e0fe3

Signed-off-by: Rob Clark <robdclark@gmail.com>
Acked-by: David Brown <davidb@codeaurora.org>
This commit is contained in:
Rob Clark 2013-10-20 11:57:52 -04:00
parent edd4fc63a3
commit 505886d506
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/msm/msm_gem.c
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@ -178,6 +178,11 @@ int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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;