linux-kernel - Re: [PATCH v4] amdgpu: remove unnecessary condition check

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Date:   Tue, 21 Apr 2020 15:05:18 +0200
From:   Christian König <christian.koenig@....com>
To:     Bernard Zhao <bernard@...o.com>,
        Felix Kuehling <Felix.Kuehling@....com>,
        Alex Deucher <alexander.deucher@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com
Subject: Re: [PATCH v4] amdgpu: remove unnecessary condition check

Am 21.04.20 um 14:22 schrieb Bernard Zhao:
> There is no need to if check again, maybe we could merge
> into the above else branch.
>
> Signed-off-by: Bernard Zhao <bernard@...o.com>

You could improve the subject line and commit message a bit, e.g. 
something like:

[PATCH] drm/amdgpu: cleanup coding style in amdkfd a bit

Make the code a bit more readable by using a common error handling pattern.


With that done the patch is Reviewed-by: Christian König 
<christian.koenig@....com>.

>
> Changes since V1:
> *commit message improve
> *code style refactoring
>
> Changes since V2:
> *code style adjust
>
> Changes since V3:
> *find the best way to merge unnecessary if/else check branch
>
> Link for V1:
> *https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fpatchwork%2Fpatch%2F1226587%2F&amp;data=02%7C01%7Cchristian.koenig%40amd.com%7C6b521b697ea84cfd324308d7e5eeab7f%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637230685564330098&amp;sdata=m2lhfgcINuB%2BT3%2BhhQjtROI3Zp38QDEilF9RTceg3HY%3D&amp;reserved=0
> ---
>   .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c  | 20 +++++++++----------
>   1 file changed, 9 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> index 9dff792c9290..acb612c53b9c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> @@ -660,15 +660,15 @@ static int reserve_bo_and_vm(struct kgd_mem *mem,
>   
>   	ret = ttm_eu_reserve_buffers(&ctx->ticket, &ctx->list,
>   				     false, &ctx->duplicates);
> -	if (!ret)
> -		ctx->reserved = true;
> -	else {
> -		pr_err("Failed to reserve buffers in ttm\n");
> +	if (ret) {
> +		pr_err("Failed to reserve buffers in ttm.\n");
>   		kfree(ctx->vm_pd);
>   		ctx->vm_pd = NULL;
> +		return ret;
>   	}
>   
> -	return ret;
> +	ctx->reserved = true;
> +	return 0;
>   }
>   
>   /**
> @@ -733,17 +733,15 @@ static int reserve_bo_and_cond_vms(struct kgd_mem *mem,
>   
>   	ret = ttm_eu_reserve_buffers(&ctx->ticket, &ctx->list,
>   				     false, &ctx->duplicates);
> -	if (!ret)
> -		ctx->reserved = true;
> -	else
> -		pr_err("Failed to reserve buffers in ttm.\n");
> -
>   	if (ret) {
> +		pr_err("Failed to reserve buffers in ttm.\n");
>   		kfree(ctx->vm_pd);
>   		ctx->vm_pd = NULL;
> +		return ret;
>   	}
>   
> -	return ret;
> +	ctx->reserved = true;
> +	return 0;
>   }
>   
>   /**