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

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Message-ID: <CAJuYYwSX-Z6ewapWbXZ6Y3ouT=W6Dk6WNDw_UFmEPZnmd4to7A@mail.gmail.com>
Date:	Fri, 25 May 2012 14:01:29 +0530
From:	Thomas Abraham <thomas.abraham@...aro.org>
To:	Vinod Koul <vinod.koul@...ux.intel.com>
Cc:	Jassi Brar <jaswinder.singh@...aro.org>,
	Tushar Behera <tushar.behera@...aro.org>,
	linux-kernel@...r.kernel.org, dan.j.williams@...el.com,
	patches@...aro.org
Subject: Re: [PATCH] dmaengine: pl330: dont complete descriptor for cyclic dma

On 25 May 2012 13:26, Vinod Koul <vinod.koul@...ux.intel.com> wrote:
> 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?

I am not sure what I have missed here. Since it was a simple change, I
think I manually edited the code for the test. I apologize for the
mistake in the test.

Regards,
Thomas.

>
> >From the code this looks as the right one.
>
> --
> ~Vinod
>
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