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

[Chris Wilson]

Quoting Dan Carpenter (2021-01-25 08:48:30)
> 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.

True.
 
> 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 at oracle.com>
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris