linux-kernel - Re: [PATCH] drm: connector: remove bogus NULL check

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Message-ID: <20190628124154.5245f629@collabora.com>
Date:   Fri, 28 Jun 2019 12:41:54 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Noralf Trønnes <noralf@...nnes.org>,
        Alex Deucher <alexander.deucher@....com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Lyude Paul <lyude@...hat.com>,
        Uma Shankar <uma.shankar@...el.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Ramalingam C <ramalingam.c@...el.com>,
        Radhakrishna Sripada <radhakrishna.sripada@...el.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm: connector: remove bogus NULL check

On Fri, 28 Jun 2019 12:39:05 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> mode->name is a character array in a structure, checking it's
> address is pointless and causes a warning with some compilers:
> 
> drivers/gpu/drm/drm_connector.c:144:15: error: address of array 'mode->name' will always evaluate to 'true'
>       [-Werror,-Wpointer-bool-conversion]
>                       mode->name ? mode->name : "",
>                       ~~~~~~^~~~ ~
> include/drm/drm_print.h:366:29: note: expanded from macro 'DRM_DEBUG_KMS'
>         drm_dbg(DRM_UT_KMS, fmt, ##__VA_ARGS__)
>                                    ^~~~~~~~~~~
> 
> Remove the check here.
> 
> Fixes: 3aeeb13d8996 ("drm/modes: Support modes names on the command line")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>

> ---
>  drivers/gpu/drm/drm_connector.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 3afed5677946..b3f2cf7eae9c 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -141,7 +141,7 @@ static void drm_connector_get_cmdline_mode(struct drm_connector *connector)
>  
>  	DRM_DEBUG_KMS("cmdline mode for connector %s %s %dx%d@...z%s%s%s\n",
>  		      connector->name,
> -		      mode->name ? mode->name : "",
> +		      mode->name,
>  		      mode->xres, mode->yres,
>  		      mode->refresh_specified ? mode->refresh : 60,
>  		      mode->rb ? " reduced blanking" : "",