linux-kernel - Re: [PATCH] drm/i915/gem: remove unused assignments

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Message-ID: <CAOaDN_T_ZVCfhmbqd1AJnt3vhTuxnGhKsxG2fjjF8-u4wXOBcg@mail.gmail.com>
Date:   Tue, 21 Jun 2022 10:26:51 +0800
From:   Katrin Jo <zys.zljxml@...il.com>
To:     Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
Cc:     dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, airlied@...ux.ie,
        Daniel Vetter <daniel@...ll.ch>, bob.beckett@...labora.com,
        matthew.auld@...el.com, thomas.hellstrom@...ux.intel.com,
        kernel@...labora.com, linux-kernel@...r.kernel.org,
        katrinzhou <katrinzhou@...cent.com>
Subject: Re: [PATCH] drm/i915/gem: remove unused assignments

On Mon, Jun 20, 2022 at 6:19 PM Tvrtko Ursulin
<tvrtko.ursulin@...ux.intel.com> wrote:
>
>
> On 20/06/2022 11:02, zys.zljxml@...il.com wrote:
> > From: katrinzhou <katrinzhou@...cent.com>
> >
> > The variable ret is reassigned and the value EINVAL is never used.
> > Thus, remove the unused assignments.
> >
> > Addresses-Coverity: ("Unused value")
> > Fixes: d4433c7600f7 ("drm/i915/gem: Use the proto-context to handle create parameters (v5)")
> > Signed-off-by: katrinzhou <katrinzhou@...cent.com>
> > ---
> >   drivers/gpu/drm/i915/gem/i915_gem_context.c | 2 --
> >   1 file changed, 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> > index ab4c5ab28e4d..d5ef5243673a 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
> > @@ -931,8 +931,6 @@ static int set_proto_ctx_param(struct drm_i915_file_private *fpriv,
> >               break;
> >
> >       case I915_CONTEXT_PARAM_PERSISTENCE:
> > -             if (args->size)
> > -                     ret = -EINVAL;
> >               ret = proto_context_set_persistence(fpriv->dev_priv, pc,
> >                                                   args->value);
>
> AFAICT fix should end up with code like this:
>
> if (args->size)
>         ret = -EINVAL;
> else
>         ret = proto_context_set_persistence(...)
> break;
>
>
> Alternatively move args->size checking into
> proto_context_set_persistence to align with set_persistence().
>
> Regards,
>
> Tvrtko
>
> >               break;

Thanks for reviewing! I sent the V2 patch, modified according to your
suggestion.

Best Regards,
Katrin