linux-kernel - Re: [PATCH] drm: Reduce scope of 'state' variable

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Message-ID: <871sqlzewc.fsf@intel.com>
Date:   Thu, 15 Jun 2017 14:09:07 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Dawid Kurek <dawikur@...il.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: Reduce scope of 'state' variable

On Thu, 15 Jun 2017, Dawid Kurek <dawikur@...il.com> wrote:
> Smaller scope reduces visibility of variable and makes usage of
> uninitialized variable less possible.
> ---
>  drivers/gpu/drm/drm_atomic.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index f32506a..ea5a9a7 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -108,10 +108,11 @@ struct drm_atomic_state *
>  drm_atomic_state_alloc(struct drm_device *dev)
>  {
>  	struct drm_mode_config *config = &dev->mode_config;
> -	struct drm_atomic_state *state;
>  
>  	if (!config->funcs->atomic_state_alloc) {
> -		state = kzalloc(sizeof(*state), GFP_KERNEL);
> +		struct drm_atomic_state *state
> +			= kzalloc(sizeof(*state), GFP_KERNEL);

Separate declaration and initialization would lead to a cleaner patch
and result.

BR,
Jani.

> +
>  		if (!state)
>  			return NULL;
>  		if (drm_atomic_state_init(dev, state) < 0) {

-- 
Jani Nikula, Intel Open Source Technology Center