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drm/i915/gvt: fix uninitialized return in intel_gvt_update_reg_whitelist()

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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>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/YA6F3oF8mRaNQWjb@mwanda
(cherry picked from commit 784f70e17e6bc423a04fb6524634a76f68ab1192)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Dan Carpenter 2021-01-25 11:48:30 +03:00 committed by Rodrigo Vivi
parent 2a8f20bb64
commit fbb2bdd22a
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/gvt/cmd_parser.c
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@ -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;
}