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

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Date:   Sat, 17 Dec 2016 21:00:57 +0900
From:   Jaewon Kim <jaewon31.kim@...il.com>
To:     Laura Abbott <labbott@...hat.com>
Cc:     Jaewon Kim <jaewon31.kim@...sung.com>, gregkh@...uxfoundation.org,
        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
Subject: Re: [PATCH] staging: android: ion: return -ENOMEM in ion_cma_heap
 allocation failure

2016-12-14 1:04 GMT+09:00 Laura Abbott <labbott@...hat.com>:
> 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>

Thank you Laura Abbott. I'm honored to get Ack from you. I looked many
patches of you.
I hope this patch to be mainlined.