linux-kernel - Re: [RFC] DMA mapping error check analysis

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Message-ID: <Pine.LNX.4.44L0.1209071218550.1674-100000@iolanthe.rowland.org>
Date:	Fri, 7 Sep 2012 12:20:35 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Shuah Khan <shuah.khan@...com>
cc:	fujita.tomonori@....ntt.co.jp,
	Andrew Morton <akpm@...ux-foundation.org>,
	<paul.gortmaker@...driver.com>, <bhelgaas@...gle.com>,
	<amwang@...hat.com>, <joerg.roedel@....com>,
	<paul.gortmaker@...driver.com>, <kubakici@...pl>,
	<dan.carpenter@...cle.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	<devel@...uxdriverproject.org>, <shuahkhan@...il.com>
Subject: Re: [RFC] DMA mapping error check analysis

On Fri, 7 Sep 2012, Shuah Khan wrote:

> I analyzed all calls to dma_map_single() and dma_map_page() in the
> kernel, to see if callers check for mapping errors, before using the
> returned address.
> 
> The goal of this analysis is to find drivers that currently do not 
> check dma mapping errors, and fix them.
> 
> I documented the results of this analysis:
> 
> http://linuxdriverproject.org/mediawiki/index.php/DMA_Mapping_Error_Analysis
> 
> Please review and give me feedback on the analysis and the proposed
> next steps.

Your first table (dma_map_single) lists drivers/usb/core/usb.c and
marks it as Bad.  This is a mistake because the code is #ifdef'ed out.  
It hasn't been used in many years; it should be removed.

Alan Stern

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