[Intel-gfx] [PATCH v6 6/7] drm/i915: deduplicate intel_pin_and_map_ringbuffer_obj() error handling

[Dave Gordon]

From: Chris Wilson <chris at chris-wilson.co.uk>

Replace multiple "unpin(); return errno;" sequences with
a branch to a single common label for all the error paths.

Extracted from Chris Wilson's patch:
    drm/i915: Refactor duplicate object vmap functions
in preparation for the reimplementation of the same.

Signed-off-by: Dave Gordon <david.s.gordon at intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
 drivers/gpu/drm/i915/intel_ringbuffer.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 434a452..15e2d29 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2077,16 +2077,14 @@ int intel_pin_and_map_ringbuffer_obj(struct drm_device *dev,
 			return ret;
 
 		ret = i915_gem_object_set_to_cpu_domain(obj, true);
-		if (ret) {
-			i915_gem_object_ggtt_unpin(obj);
-			return ret;
-		}
+		if (ret)
+			goto unpin;
 
 		ringbuf->virtual_start = i915_gem_object_vmap_range(obj, 0,
 						ringbuf->size >> PAGE_SHIFT);
 		if (ringbuf->virtual_start == NULL) {
-			i915_gem_object_ggtt_unpin(obj);
-			return -ENOMEM;
+			ret = -ENOMEM;
+			goto unpin;
 		}
 	} else {
 		ret = i915_gem_obj_ggtt_pin(obj, PAGE_SIZE, PIN_MAPPABLE);
@@ -2094,10 +2092,8 @@ int intel_pin_and_map_ringbuffer_obj(struct drm_device *dev,
 			return ret;
 
 		ret = i915_gem_object_set_to_gtt_domain(obj, true);
-		if (ret) {
-			i915_gem_object_ggtt_unpin(obj);
-			return ret;
-		}
+		if (ret)
+			goto unpin;
 
 		/* Access through the GTT requires the device to be awake. */
 		assert_rpm_wakelock_held(dev_priv);
@@ -2105,14 +2101,18 @@ int intel_pin_and_map_ringbuffer_obj(struct drm_device *dev,
 		ringbuf->virtual_start = ioremap_wc(dev_priv->gtt.mappable_base +
 						    i915_gem_obj_ggtt_offset(obj), ringbuf->size);
 		if (ringbuf->virtual_start == NULL) {
-			i915_gem_object_ggtt_unpin(obj);
-			return -EINVAL;
+			ret = -ENOMEM;
+			goto unpin;
 		}
 	}
 
 	ringbuf->vma = i915_gem_obj_to_ggtt(obj);
 
 	return 0;
+
+unpin:
+	i915_gem_object_ggtt_unpin(obj);
+	return ret;
 }
 
 static void intel_destroy_ringbuffer_obj(struct intel_ringbuffer *ringbuf)
-- 
1.9.1