linux-kernel - [ 27/40] drm/i915: EBUSY status handling added to i915_gem

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Date:	Mon, 18 Mar 2013 14:11:05 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Mika Kuoppala <mika.kuoppala@...el.com>,
	Dmitry Rogozhkin <dmitry.v.rogozhkin@...el.com>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	Daniel Vetter <daniel.vetter@...ll.ch>
Subject: [ 27/40] drm/i915: EBUSY status handling added to i915_gem_fault().

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dmitry Rogozhkin <dmitry.v.rogozhkin@...el.com>

commit e79e0fe380847493266fba557217e2773c61bd1b upstream.

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 <mika.kuoppala@...el.com>
Signed-off-by: Dmitry Rogozhkin <dmitry.v.rogozhkin@...el.com>
Reviewed-by: Chris Wilson <chris@...is-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/i915_gem.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1256,6 +1256,11 @@ 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;


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