linux-kernel - Re: [PATCH] CMA: correct unlock target

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Date:	Thu, 29 May 2014 07:56:53 -0700
From:	Laura Abbott <lauraa@...eaurora.org>
To:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
CC:	Michal Nazarewicz <mina86@...a86.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Russell King - ARM Linux <linux@....linux.org.uk>
Subject: Re: [PATCH] CMA: correct unlock target

On 5/29/2014 12:34 AM, Marek Szyprowski wrote:
> Hello,
> 
> On 2014-05-29 08:29, Joonsoo Kim wrote:
>> 'cma: Remove potential deadlock situation' introduces per cma area mutex
>> for bitmap management. It is good, but there is one mistake. When we
>> can't find appropriate area in bitmap, we release cma_mutex global lock
>> rather than cma->lock and this is a bug. So fix it.
>>
>> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
> 
> Thanks for spotting this issue. I've added it to my tree.
> 
>> diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
>> index 6f6bffc..83969f8 100644
>> --- a/drivers/base/dma-contiguous.c
>> +++ b/drivers/base/dma-contiguous.c
>> @@ -331,7 +331,7 @@ struct page *dma_alloc_from_contiguous(struct device *dev, int count,
>>           pageno = bitmap_find_next_zero_area(cma->bitmap, cma->count,
>>                               start, count, mask);
>>           if (pageno >= cma->count) {
>> -            mutex_unlock(&cma_mutex);
>> +            mutex_unlock(&cma->lock);
>>               break;
>>           }
>>           bitmap_set(cma->bitmap, pageno, count);
> 
> Best regards

Acked-by: Laura Abbott <lauraa@...eaurora.org>

Who actually ended up picking up that patch? I sent it out but didn't realize it had been
picked up.

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