[PATCH] drm/i915: Cleanup error paths through eb_lookup_vma()

* [PATCH] drm/i915: Cleanup error paths through eb_lookup_vma()
@ 2017-09-12 15:07 Chris Wilson
  2017-09-12 15:21 ` Tvrtko Ursulin
                   ` (2 more replies)
  0 siblings, 3 replies; 5+ messages in thread
From: Chris Wilson @ 2017-09-12 15:07 UTC (permalink / raw)
  To: intel-gfx

Following the simplification to a single lookup loop in commit
170fa29b14fa ("drm/i915: Simplify eb_lookup_vmas()") and commit
d1b48c1e7184 ("drm/i915: Replace execbuf vma ht with an idr"), we can go
one setup further and reorder the error paths so that the state of the
local variable obj is always known to the compiler and doesn't need the
uninitialized_var markup to squelch a compiler warning.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/i915_gem_execbuffer.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 7687483ff218..214a850b4b3c 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -679,7 +679,7 @@ static int eb_select_context(struct i915_execbuffer *eb)
 static int eb_lookup_vmas(struct i915_execbuffer *eb)
 {
 	struct radix_tree_root *handles_vma = &eb->ctx->handles_vma;
-	struct drm_i915_gem_object *uninitialized_var(obj);
+	struct drm_i915_gem_object *obj;
 	unsigned int i;
 	int err;
 
@@ -725,19 +725,17 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
 			goto err_obj;
 		}
 
+		/* transfer ref to ctx */
 		vma->open_count++;
 		list_add(&lut->obj_link, &obj->lut_list);
 		list_add(&lut->ctx_link, &eb->ctx->handles_list);
 		lut->ctx = eb->ctx;
 		lut->handle = handle;
 
-		/* transfer ref to ctx */
-		obj = NULL;
-
 add_vma:
 		err = eb_add_vma(eb, i, vma);
 		if (unlikely(err))
-			goto err_obj;
+			goto err_vma;
 
 		GEM_BUG_ON(vma != eb->vma[i]);
 		GEM_BUG_ON(vma->exec_flags != &eb->flags[i]);
@@ -766,8 +764,7 @@ static int eb_lookup_vmas(struct i915_execbuffer *eb)
 	return eb_reserve(eb);
 
 err_obj:
-	if (obj)
-		i915_gem_object_put(obj);
+	i915_gem_object_put(obj);
 err_vma:
 	eb->vma[i] = NULL;
 	return err;
-- 
2.14.1

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