From: Dmitry Rogozhkin <dmitry.v.rogozhkin at intel.com> 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. Tested-by: Mika Kuoppala <mika.kuoppala at intel.com> Signed-off-by: Dmitry Rogozhkin <dmitry.v.rogozhkin at intel.com> --- drivers/gpu/drm/i915/i915_gem.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 274d25d..18d9abb 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1158,6 +1158,10 @@ 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; -- 1.7.9.5
