linux-kernel - Re: [PATCH RFC] swiotlb: Disable swiotlb overflow support when CONFIG

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Message-ID: <1342549647.2539.29.camel@lorien2>
Date:	Tue, 17 Jul 2012 12:27:27 -0600
From:	Shuah Khan <shuah.khan@...com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	fujita.tomonori@....ntt.co.jp, LKML <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, paul.gortmaker@...driver.com,
	bhelgaas@...gle.com, amwang@...hat.com, shuahkhan@...il.com
Subject: Re: [PATCH RFC] swiotlb: Disable swiotlb overflow support when
 CONFIG_ISA is enabled

On Mon, 2012-07-16 at 12:01 -0400, Konrad Rzeszutek Wilk wrote:

> > > The first goal is to figure out which of the drivers aren't doing this
> > > properly. This should be possible by just grepping for 'dma_map' and 
> > > seeing which ones don't do the 'dma_check' right after.
> > 

I did cscope searches two different ways on linux-next July 12th git

map_page - in this case I looked at all of the dma_ops.map_page() calls
to see if they are followed by dma_mapping_error() calls. Found the
following cases that don't check map_page() return value.

arch/powerpc/platforms/cell/iommu.c - dma_fixed_map_page()
drivers/net/ethernet/sun/niu.c - niu_rbr_add_page()
net/sunrpc/xprtrdma/svc_rdma_sendto.c - dma_map_xdr()

dma_map - in this case again I looked for calls to dma_map(). Found the
following cases where return isn't checked:

drivers/atm/fore200e.c
drivers/isdn/hardware/eicon/di.c

I am somewhat surprised to find only a few cases. Hoping I covered all
the bases, can you think of anything else I should look for before
concluding these are the cases that need fixing?

-- Shuah

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