linux-kernel - Re: [PATCH] drm/ssd130x: Remove the use of dev_err

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Message-ID: <87plcafeoz.fsf@minerva.mail-host-address-is-not-set>
Date: Mon, 01 Sep 2025 16:08:28 +0200
From: Javier Martinez Canillas <javierm@...hat.com>
To: Liao Yuanhong <liaoyuanhong@...o.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
 Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>,
 Simona Vetter <simona@...ll.ch>, "open list:DRM DRIVERS"
 <dri-devel@...ts.freedesktop.org>, open list
 <linux-kernel@...r.kernel.org>
Cc: Liao Yuanhong <liaoyuanhong@...o.com>
Subject: Re: [PATCH] drm/ssd130x: Remove the use of dev_err_probe()

Liao Yuanhong <liaoyuanhong@...o.com> writes:

Hello Liao,

Thanks for your patch.

> Logging messages that show some type of "out of memory" error are generally
> unnecessary as there is a generic message and a stack dump done by the
> memory subsystem. These messages generally increase kernel size without
> much added value[1].
>
> The dev_err_probe() doesn't do anything when error is '-ENOMEM'. Therefore,
> remove the useless call to dev_err_probe(), and just return the value
> instead.
>
> [1]: https://lore.kernel.org/lkml/1402419340.30479.18.camel@joe-AO725/
>
> Signed-off-by: Liao Yuanhong <liaoyuanhong@...o.com>
> ---
>  drivers/gpu/drm/solomon/ssd130x-spi.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/solomon/ssd130x-spi.c b/drivers/gpu/drm/solomon/ssd130x-spi.c
> index 7c935870f7d2..b52f5fd592a1 100644
> --- a/drivers/gpu/drm/solomon/ssd130x-spi.c
> +++ b/drivers/gpu/drm/solomon/ssd130x-spi.c
> @@ -74,8 +74,7 @@ static int ssd130x_spi_probe(struct spi_device *spi)
>  
>  	t = devm_kzalloc(dev, sizeof(*t), GFP_KERNEL);
>  	if (!t)
> -		return dev_err_probe(dev, -ENOMEM,
> -				     "Failed to allocate SPI transport data\n");
> +		return -ENOMEM;
>  
>  	t->spi = spi;
>  	t->dc = dc;
> -- 
> 2.34.1
>

Reviewed-by: Javier Martinez Canillas <javierm@...hat.com>

Pushed to drm-misc (drm-misc-next). Thanks!

-- 
Best regards,

Javier Martinez Canillas
Core Platforms
Red Hat