Hello Chris Wilson,
The patch f40a7b7558ef: "drm/i915: Initial selftests for exercising
eviction" from Feb 13, 2017, leads to the following static checker
warning:
drivers/gpu/drm/i915/selftests/i915_gem_evict.c:193 igt_overcommit()
warn: passing a valid pointer to 'PTR_ERR'
drivers/gpu/drm/i915/selftests/i915_gem_evict.c
167 static int igt_overcommit(void *arg)
168 {
169 struct drm_i915_private *i915 = arg;
170 struct drm_i915_gem_object *obj;
171 struct i915_vma *vma;
172 LIST_HEAD(objects);
173 int err;
174
175 /* Fill the GGTT with pinned objects and then try to pin one more.
176 * We expect it to fail.
177 */
178
179 err = populate_ggtt(i915, &objects);
180 if (err)
181 goto cleanup;
182
183 obj = i915_gem_object_create_internal(i915, I915_GTT_PAGE_SIZE);
184 if (IS_ERR(obj)) {
185 err = PTR_ERR(obj);
186 goto cleanup;
187 }
188
189 quirk_add(obj, &objects);
190
191 vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
192 if (!IS_ERR(vma) || PTR_ERR(vma) != -ENOSPC) {
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This condition doesn't make sense. It's equivalent to:
if (PTR_ERR(vma) != -ENOSPC) {
Maybe what was intended was:
if (IS_ERR(vma) && PTR_ERR(vma) != -ENOSPC) {
I don't know.
--> 193 pr_err("Failed to evict+insert, i915_gem_object_ggtt_pin returned err=%d\n", (int)PTR_ERR(vma));
194 err = -EINVAL;
195 goto cleanup;
196 }
197
198 cleanup:
199 cleanup_objects(i915, &objects);
200 return err;
201 }
regards,
dan carpenter
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