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[6/6] drm/msm: EBUSY status handling in msm_gem_fault()

Message ID 1382285459-21490-7-git-send-email-robdclark@gmail.com (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Rob Clark Oct. 20, 2013, 4:10 p.m. UTC 
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>
---
 drivers/gpu/drm/msm/msm_gem.c | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 291939d..e587d25 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -178,6 +178,11 @@  out:
 	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;