linux-kernel - Re: [PATCH] staging: android: ion: return -ENOMEM in ion_cma

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Message-ID: <db51d8ca-e95f-ad93-ff6d-c55762d484c0@redhat.com>
Date:   Tue, 13 Dec 2016 08:04:06 -0800
From:   Laura Abbott <labbott@...hat.com>
To:     Jaewon Kim <jaewon31.kim@...sung.com>, gregkh@...uxfoundation.org
Cc:     sumit.semwal@...aro.org, tixy@...aro.org, prime.zeng@...wei.com,
        tranmanphong@...il.com, fabio.estevam@...escale.com,
        ccross@...roid.com, rebecca@...roid.com,
        benjamin.gaignard@...aro.org, arve@...roid.com,
        riandrews@...roid.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, jaewon31.kim@...il.com
Subject: Re: [PATCH] staging: android: ion: return -ENOMEM in ion_cma_heap
 allocation failure

On 12/08/2016 09:05 PM, Jaewon Kim wrote:
> Initial Commit 349c9e138551 ("gpu: ion: add CMA heap") returns -1 in allocation
> failure. The returned value is passed up to userspace through ioctl. So user can
> misunderstand error reason as -EPERM(1) rather than -ENOMEM(12).
> 
> This patch simply changed this to return -ENOMEM.
> 
> Signed-off-by: Jaewon Kim <jaewon31.kim@...sung.com>
> ---
>  drivers/staging/android/ion/ion_cma_heap.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/android/ion/ion_cma_heap.c b/drivers/staging/android/ion/ion_cma_heap.c
> index 6c7de74..22b9582 100644
> --- a/drivers/staging/android/ion/ion_cma_heap.c
> +++ b/drivers/staging/android/ion/ion_cma_heap.c
> @@ -24,8 +24,6 @@
>  #include "ion.h"
>  #include "ion_priv.h"
>  
> -#define ION_CMA_ALLOCATE_FAILED -1
> -
>  struct ion_cma_heap {
>  	struct ion_heap heap;
>  	struct device *dev;
> @@ -59,7 +57,7 @@ static int ion_cma_allocate(struct ion_heap *heap, struct ion_buffer *buffer,
>  
>  	info = kzalloc(sizeof(struct ion_cma_buffer_info), GFP_KERNEL);
>  	if (!info)
> -		return ION_CMA_ALLOCATE_FAILED;
> +		return -ENOMEM;
>  
>  	info->cpu_addr = dma_alloc_coherent(dev, len, &(info->handle),
>  						GFP_HIGHUSER | __GFP_ZERO);
> @@ -88,7 +86,7 @@ static int ion_cma_allocate(struct ion_heap *heap, struct ion_buffer *buffer,
>  	dma_free_coherent(dev, len, info->cpu_addr, info->handle);
>  err:
>  	kfree(info);
> -	return ION_CMA_ALLOCATE_FAILED;
> +	return -ENOMEM;
>  }
>  
>  static void ion_cma_free(struct ion_buffer *buffer)
> 

Happy to see cleanup

Acked-by: Laura Abbott <labbott@...hat.com>