From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: linux-mmc@vger.kernel.org, g.liakhovetski@gmx.de,
ian@mnementh.co.uk, cjb@laptop.org
Cc: linux-sh@vger.kernel.org, max.filippov@cogentembedded.com
Subject: Re: [PATCH v2] tmio_mmc_dma: fix PIO fallback on SDHI
Date: Fri, 09 Aug 2013 18:32:12 +0000 [thread overview]
Message-ID: <520535AC.6000200@cogentembedded.com> (raw)
In-Reply-To: <201308030233.29446.sergei.shtylyov@cogentembedded.com>
Hello.
On 08/03/2013 02:33 AM, Sergei Shtylyov wrote:
> I'm testing SH-Mobile SDHI driver in DMA mode with a new DMA controller using
The driver for this controller is using drivers/dma/sh/shdma-base.c framework.
> 'bonnie++' and getting DMA error
And I suspect some bug/race in shdma-base.c. The S/G request that fails
seems to always consist of 32 segments (maximum for shdma-base.c) and it fails
like this:
hpb-dma-engine hpb-dma-engine: No free link descriptor available
which is a message that shdma_add_desc() prints when shdma_get-desc() returns
NULL. When I turn on all dev_dbg() calls (via #define DEBUG) in shdma-base.c.
the error is *gone*...
> Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
> Cc: stable@vger.kernel.org # 3.1+
WBR, Sergei
prev parent reply other threads:[~2013-08-09 18:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-02 22:33 [PATCH v2] tmio_mmc_dma: fix PIO fallback on SDHI Sergei Shtylyov
2013-08-03 22:36 ` Guennadi Liakhovetski
2013-08-04 14:10 ` Sergei Shtylyov
2013-08-05 22:37 ` Sergei Shtylyov
2013-08-09 18:41 ` Sergei Shtylyov
2013-08-25 3:39 ` Chris Ball
2013-08-09 18:32 ` Sergei Shtylyov [this message]
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