Smatch found an uninitialized variable bug in this code:
drivers/gpu/drm/i915/gvt/cmd_parser.c:3191 intel_gvt_update_reg_whitelist() error: uninitialized symbol 'ret'.
The first thing that Smatch complains about is that "ret" isn't set if we don't enter the "for_each_engine(engine, &dev_priv->gt, id) {" loop. Presumably we always have at least one engine so that's a false positive.
But it's definitely a bug to not set "ret" if i915_gem_object_pin_map() fails.
Let's fix the bug and silence the false positive.
Fixes: 493f30cd086e ("drm/i915/gvt: parse init context to update cmd accessible reg whitelist") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com --- drivers/gpu/drm/i915/gvt/cmd_parser.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c index 7fb91de06557..d54ea0e4681d 100644 --- a/drivers/gpu/drm/i915/gvt/cmd_parser.c +++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c @@ -3103,7 +3103,7 @@ void intel_gvt_update_reg_whitelist(struct intel_vgpu *vgpu) struct intel_vgpu_submission *s = &vgpu->submission; struct i915_request *requests[I915_NUM_ENGINES] = {}; bool is_ctx_pinned[I915_NUM_ENGINES] = {}; - int ret; + int ret = 0;
if (gvt->is_reg_whitelist_updated) return; @@ -3157,6 +3157,7 @@ void intel_gvt_update_reg_whitelist(struct intel_vgpu *vgpu) if (IS_ERR(vaddr)) { gvt_err("failed to pin init ctx obj, ring=%d, err=%lx\n", id, PTR_ERR(vaddr)); + ret = PTR_ERR(vaddr); goto out; }