Commit 505886d5 authored Oct 20, 2013 by Rob Clark

drm/msm: EBUSY status handling in msm_gem_fault()



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>

parent edd4fc63

drivers/gpu/drm/msm/msm_gem.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -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;