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

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Date:	Fri, 25 May 2012 13:26:07 +0530
From:	Vinod Koul <vinod.koul@...ux.intel.com>
To:	Jassi Brar <jaswinder.singh@...aro.org>,
	'Thomas Abraham' <thomas.abraham@...aro.org>
Cc:	Tushar Behera <tushar.behera@...aro.org>,
	linux-kernel@...r.kernel.org, dan.j.williams@...el.com,
	patches@...aro.org, Thomas Abraham <thomas.abraham@...aro.org>
Subject: Re: [PATCH] dmaengine: pl330: dont complete descriptor for cyclic
 dma

On Thu, 2012-05-24 at 10:34 +0530, Jassi Brar wrote:
> On 24 May 2012 09:54, Tushar Behera <tushar.behera@...aro.org> wrote:
> > 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);
> >>               }
> >
> Acked-by: Jassi Brar <jaswinder.singh@...aro.org>
> 
> Obviously a typo, but the commit eab2158 had a tested-by, so I hope
> this doesn't break something else.
Precisely my worry as well. Thomas?

>>From the code this looks as the right one.

-- 
~Vinod

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