linux-kernel - Re: [PATCH 3/5] dmaengine: bcm2835-dma: Fix memory leak when stopping a running transfer

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Date:	Sat, 28 Mar 2015 23:50:08 +0200
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	<vinod.koul@...el.com>, <linux@....linux.org.uk>,
	<dan.j.williams@...el.com>, <dmaengine@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, Lee Jones <lee@...nel.org>
Subject: Re: [PATCH 3/5] dmaengine: bcm2835-dma: Fix memory leak when stopping
 a running transfer

Thanks,

On 03/28/2015 05:57 AM, Stephen Warren wrote:
> On 03/27/2015 05:35 AM, Peter Ujfalusi wrote:
>> The vd->node is removed from the lists when the transfer started so the
>> vchan_get_all_descriptors() will not find it. This results memory leak.
> 
> Acked-by: Stephen Warren <swarren@...dotorg.org>
> (I'm just assuming the explanation makes sense and is correct; more of a
> not-a-NAK so it doesn't look like a lack of response!)

I can not debug the bcm2835-dma driver, but the exact same pattern existed in
edma and omap-dma driver and they both leaked the edesc in a same predictable
fashion. I just checked the virt-dma users and sent the fixes for the ones
which had the same flow of events.

-- 
Péter
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