linux-kernel - Re: [PATCH] drm/imx: Fix error handling

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Date:   Tue, 01 Nov 2016 10:07:24 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH] drm/imx: Fix error handling

Hi Christophe,

Am Montag, den 31.10.2016, 18:59 +0100 schrieb Christophe JAILLET:
> 'drm_dev_alloc()' returns an error pointer in case of error, not NULL
> So test it with IS_ERR.
> 
> This behavior has been introduced recently in	0f2886057be3. For some
> reason, this file has not been updated.
> 
> Fixes: 0f2886057be3 ("drm: Don't swallow error codes in drm_dev_alloc()")
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  drivers/gpu/drm/imx/imx-drm-core.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/imx/imx-drm-core.c b/drivers/gpu/drm/imx/imx-drm-core.c
> index 98df09c2b388..3acc976cc04e 100644
> --- a/drivers/gpu/drm/imx/imx-drm-core.c
> +++ b/drivers/gpu/drm/imx/imx-drm-core.c
> @@ -357,8 +357,8 @@ static int imx_drm_bind(struct device *dev)
>  	int ret;
>  
>  	drm = drm_dev_alloc(&imx_drm_driver, dev);
> -	if (!drm)
> -		return -ENOMEM;
> +	if (IS_ERR(drm))
> +		return PTR_ERR(drm);
>  
>  	imxdrm = devm_kzalloc(dev, sizeof(*imxdrm), GFP_KERNEL);
>  	if (!imxdrm) {

Thank you for the patch. The same fix is in the queue already:
8cca354816ad ("drm/imx: drm_dev_alloc() returns error pointers"). Only
Dan selected commit 54db5decce17 ("drm/imx: drop deprecated load/unload
drm_driver ops") as the culprit.

regards
Philipp