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

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Date:   Mon, 20 Jun 2022 11:18:53 +0100
From:   Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
To:     zys.zljxml@...il.com, 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@...ll.ch
Cc:     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 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;