linux-kernel - Re: [PATCH 2/2] scsi: Use new __dma_buffer to align sense buffer in scsi

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Message-Id: <1198272547.6737.18.camel@pasglop>
Date:	Sat, 22 Dec 2007 08:29:07 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>, rdreier@...co.com,
	linux-scsi@...r.kernel.org, rmk@....linux.org.uk,
	davem@...emloft.net, james.bottomley@...eleye.com,
	ralf@...ux-mips.org
Subject: Re: [PATCH 2/2] scsi: Use new __dma_buffer to align sense buffer
	in scsi_cmnd


On Fri, 2007-12-21 at 06:16 -0700, Matthew Wilcox wrote:
> On Fri, Dec 21, 2007 at 10:33:26AM +0000, Alan Cox wrote:
> > On Fri, 21 Dec 2007 13:30:08 +1100
> > Benjamin Herrenschmidt <benh@...nel.crashing.org> wrote:
> > 
> > > The sense buffer ins scsi_cmnd can nowadays be DMA'ed into directly
> > > by some low level drivers (that typically happens with USB mass
> > > storage).
> > 
> > Should that not be fixed in USB storage by using pci_alloc_coherent on the
> > PCI device of the hub not peeing directly into kernel space ?
> 
> That's what I said, but Ben seems fixated on this particular fix.

That means more understanding of the SCSI code than I have right now
and a _lot_ more time than I have right now. It's not only USB storage,
it's anything that does DMA and uses the generic error handling.

Ben.


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