linux-kernel - Re: [PATCH -next] drm/amdgpu: fix return value check in amdgpu_debugfs_regs

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Date:	Tue, 19 Jul 2016 14:25:14 +0200
From:	Christian König <christian.koenig@....com>
To:	Wei Yongjun <weiyj_lk@....com>, <alexander.deucher@....com>,
	<airlied@...ux.ie>, <Flora.Cui@....com>, <David1.Zhou@....com>,
	<tom.stdenis@....com>, <Jammy.Zhou@....com>
CC:	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] drm/amdgpu: fix return value check in
 amdgpu_debugfs_regs_init()

Am 19.07.2016 um 14:14 schrieb Wei Yongjun:
> From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
>
> In case of error, the function debugfs_create_*() returns NULL
> pointer not ERR_PTR() if debugfs is enabled. The IS_ERR() test
> in the return value check should be replaced with NULL test.
> (defined(CONFIG_DEBUG_FS) make sure debugfs is enabled)
>
> Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

Reviewed-by: Christian König <christian.koenig@....com>.

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index 614fb02..0c992d3 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -2530,12 +2530,12 @@ static int amdgpu_debugfs_regs_init(struct amdgpu_device *adev)
>   		ent = debugfs_create_file(debugfs_regs_names[i],
>   					  S_IFREG | S_IRUGO, root,
>   					  adev, debugfs_regs[i]);
> -		if (IS_ERR(ent)) {
> +		if (!ent) {
>   			for (j = 0; j < i; j++) {
>   				debugfs_remove(adev->debugfs_regs[i]);
>   				adev->debugfs_regs[i] = NULL;
>   			}
> -			return PTR_ERR(ent);
> +			return -ENOMEM;
>   		}
>   
>   		if (!i)
>
>