linux-kernel - Re: [PATCH] dmaengine: pl330: dont complete descriptor for cyclic dma

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Date:	Thu, 24 May 2012 09:54:50 +0530
From:	Tushar Behera <tushar.behera@...aro.org>
To:	linux-kernel@...r.kernel.org
CC:	vinod.koul@...el.com, dan.j.williams@...el.com, patches@...aro.org,
	Jassi Brar <jaswinder.singh@...aro.org>
Subject: Re: [PATCH] dmaengine: pl330: dont complete descriptor for cyclic
 dma

Forgot to add driver author in the original mail, adding now.

On 05/23/2012 04:47 PM, Tushar Behera wrote:
> Commit eab215855803 ("dmaengine: pl330: dont complete descriptor for
> cyclic dma") wrongly completes descriptor for cyclic dma, hence following
> BUG_ON is still hit with cyclic DMA operations.
> 
> kernel BUG at drivers/dma/dmaengine.h:53!
> 
> Signed-off-by: Tushar Behera <tushar.behera@...aro.org>
> ---
>  drivers/dma/pl330.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
> index fa3fb21..8c44f17 100644
> --- a/drivers/dma/pl330.c
> +++ b/drivers/dma/pl330.c
> @@ -2322,7 +2322,7 @@ static void pl330_tasklet(unsigned long data)
>  	/* Pick up ripe tomatoes */
>  	list_for_each_entry_safe(desc, _dt, &pch->work_list, node)
>  		if (desc->status == DONE) {
> -			if (pch->cyclic)
> +			if (!pch->cyclic)
>  				dma_cookie_complete(&desc->txd);
>  			list_move_tail(&desc->node, &list);
>  		}


-- 
Tushar Behera
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