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Re: [PATCH RFT RESEND linux-next] mips: dma-mapping: support debug_dma_m

To: m.szyprowski@samsung.com
Subject: Re: [PATCH RFT RESEND linux-next] mips: dma-mapping: support debug_dma_mapping_error
From: Shuah Khan <shuah.khan@hp.com>
Date: Thu, 15 Nov 2012 11:21:21 -0700
Cc: ralf@linux-mips.org, kyungmin.park@samsung.com, arnd@arndb.de, andrzej.p@samsung.com, linux-mips@linux-mips.org, ddaney.cavm@gmail.com, shuahkhan@gmail.com, LKML <linux-kernel@vger.kernel.org>
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Reply-to: shuah.khan@hp.com
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On Tue, 2012-10-30 at 13:58 -0600, Shuah Khan wrote:
> On Fri, 2012-10-26 at 15:31 -0700, David Daney wrote:
> > On 10/26/2012 02:51 PM, Shuah Khan wrote:
> > 
> > >>>> On 10/26/2012 09:01 AM, Shuah Khan wrote:
> > >>>>> Add support for debug_dma_mapping_error() call to avoid warning from
> > >>>>> debug_dma_unmap() interface when it checks for mapping error checked
> > >>>>> status. Without this patch, device driver failed to check map error
> > >>>>> warning is generated.
> > 
> > I'm confused.
> > 
> > Your claim that a 'warning is generated' seems to be in conflict with...
> > 
> > 
> > [...]
> > > Got it. Thanks. I would volunteer to look at fixing all the problems,
> > > but unfortunately I don't have a MIPS box handy
> > 
> > This statement that you don't have hardware that exhibits the problem.
> > 
> > How was the patch tested?  How do you even know there is a problem?
> 
> I enhanced the existing dma debug interfaces to add an interface to
> debug missing dma_mapping_error() checks. That went into linux-next.
> With this patch, when dma_map_page() and dma_map_single() are debugged
> with a call to debug_dma_map_page() and the corresponding
> dma_mapping_error() interface doesn't call debug_dma_mapping_error()
> interface, a warning will be generated. I have been sending changes to
> arch specific dma_mapping_error() routines to add this debug interface.
> That is why I marked this patch RFT requesting testing.


Marek,

This one is for mips to go through your tree with the other arch patches
for debug_dma_mapping_error().

Thanks,
-- Shuah


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