drm/i915: Cleanup error paths through eb_lookup_vma()

Following the simplification to a single lookup loop in commit
20414d4dd5e7 ("drm/i915: Simplify eb_lookup_vmas()") and commit
1b5dde0153b2 ("drm/i915: Replace execbuf vma ht with an idr"), we can go
one step 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>
Link: https://patchwork.freedesktop.org/patch/msgid/20170912150752.20411-1-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 7687483ff21807313959ba86bead753eb6a255c6..214a850b4b3cb1f2fb7f13212e298e19aaede99d 100644 (file)
--- 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 @@ add_vma:
        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;