From e79e0fe380847493266fba557217e2773c61bd1b Mon Sep 17 00:00:00 2001 From: Dmitry Rogozhkin Date: Wed, 3 Oct 2012 17:15:26 +0300 Subject: [PATCH] drm/i915: EBUSY status handling added to i915_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. Note that this fixes i-g-t/tests/gem_threaded_tiled_access. Tested-by: Mika Kuoppala Signed-off-by: Dmitry Rogozhkin Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_gem.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 76bbb37..5fa3419 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1400,6 +1400,11 @@ 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; -- 2.7.4