linux-kernel - Re: [PATCH] dma: mmp_tdma: kill tasklet when free dma channel

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Message-ID: <20130612095128.GT4107@intel.com>
Date:	Wed, 12 Jun 2013 15:21:29 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Qiao Zhou <zhouqiao@...vell.com>
Cc:	djbw@...com, zhangfei.gao@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma: mmp_tdma: kill tasklet when free dma channel

On Fri, Jun 07, 2013 at 07:40:40PM +0800, Qiao Zhou wrote:
> kill tasklet task when free dam channel, otherwise the task may
typo			      ^^^^

> run after related resource is released, then unknown things may
> happen.
Well, why would tasklet run when channel is freed. You are supposed to cleanup
the DMA channel on free. Ensure all transaction are aborted

Sounds like masking some issue

--
~Vinod
> 
> Signed-off-by: Qiao Zhou <zhouqiao@...vell.com>
> ---
>  drivers/dma/mmp_tdma.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/dma/mmp_tdma.c b/drivers/dma/mmp_tdma.c
> index 43d5a6c..2622b2a 100644
> --- a/drivers/dma/mmp_tdma.c
> +++ b/drivers/dma/mmp_tdma.c
> @@ -333,6 +333,9 @@ static void mmp_tdma_free_chan_resources(struct dma_chan *chan)
>  
>  	if (tdmac->irq)
>  		devm_free_irq(tdmac->dev, tdmac->irq, tdmac);
> +
> +	tasklet_kill(&tdmac->tasklet);
> +
>  	mmp_tdma_free_descriptor(tdmac);
>  	return;
>  }
> -- 
> 1.7.0.4
> 

-- 
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