linux-kernel - Re: [PATCH 4/5] dmaengine: hsu: Fix memory leak when stopping a running transfer

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Date:	Thu, 07 May 2015 19:26:08 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
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
Subject: Re: [PATCH 4/5] dmaengine: hsu: Fix memory leak when stopping a
 running transfer

On Fri, 2015-03-27 at 13:35 +0200, 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.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> CC: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/dma/hsu/hsu.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c
> index 683ba9b62795..d1864bda008f 100644
> --- a/drivers/dma/hsu/hsu.c
> +++ b/drivers/dma/hsu/hsu.c
> @@ -387,7 +387,10 @@ static int hsu_dma_terminate_all(struct dma_chan *chan)
>  	spin_lock_irqsave(&hsuc->vchan.lock, flags);
>  
>  	hsu_dma_stop_channel(hsuc);
> -	hsuc->desc = NULL;
> +	if (hsuc->desc) {
> +		hsu_dma_desc_free(&hsuc->desc->vchan);

By the way, it should be 'vdesc);' at the end.

> +		hsuc->desc = NULL;
> +	}
>  
>  	vchan_get_all_descriptors(&hsuc->vchan, &head);
>  	spin_unlock_irqrestore(&hsuc->vchan.lock, flags);


-- 
Andy Shevchenko <andriy.shevchenko@...el.com>
Intel Finland Oy

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