linux-kernel - Re: [PATCH] drm/amdgpu: use ERR_PTR() to return from amdgpu_mn

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Date:	Thu, 28 Apr 2016 12:06:44 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Arnd Bergmann <arnd@...db.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	David Airlie <airlied@...ux.ie>,
	Felix Kuehling <Felix.Kuehling@....com>,
	Jammy Zhou <Jammy.Zhou@....com>, Monk Liu <monk.liu@....com>,
	Jack Xiao <Jack.Xiao@....com>, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/amdgpu: use ERR_PTR() to return from amdgpu_mn_get

On Thu 28-04-16 11:33:48, Arnd Bergmann wrote:
> The newly added failure path in amdgpu_mn_get() use the
> wrong return type:
> 
> drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c: In function 'amdgpu_mn_get':
> drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c:237:10: error: return makes pointer from integer without a cast
> 
> This adds the necessary ERR_PTR() conversion.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> Fixes: ad35eee9fb17 ("drm/amdgpu: make amdgpu_mn_get wait for mmap_sem killable")

This is in the mmotm tree so the sha is unstable.

Acked-by: Michal Hocko <mhocko@...e.com>

Thanks for catching this.

Andrew, could you fold this into the original patch please?

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
> index cf90686a50d1..32fa7b7913f7 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
> @@ -234,7 +234,7 @@ static struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev)
>  	mutex_lock(&adev->mn_lock);
>  	if (down_write_killable(&mm->mmap_sem)) {
>  		mutex_unlock(&adev->mn_lock);
> -		return -EINTR;
> +		return ERR_PTR(-EINTR);
>  	}
>  
>  	hash_for_each_possible(adev->mn_hash, rmn, node, (unsigned long)mm)
> -- 
> 2.7.0

-- 
Michal Hocko
SUSE Labs