linux-kernel - Re: [PATCH] CDROM: use kmalloced buffers instead of buffers on stack

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Message-ID: <20080323114743.GB7612@cvg>
Date:	Sun, 23 Mar 2008 14:47:43 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:	linux-kernel@...r.kernel.org, axboe@...nel.dk
Subject: Re: [PATCH] CDROM: use kmalloced buffers instead of buffers on
	stack

[Thomas Bogendoerfer - Sun, Mar 23, 2008 at 12:15:32PM +0100]
| If cdrom commands are issued to a scsi drive in most cases the buffer
| will be filled via dma. This leads to bad stack corruption on non coherent
| platforms, because the buffers are neither cache line aligned nor is
| the size a multiple of the cache line size. Using kmalloced buffers
| avoids this.
| 
| Signed-off-by: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
| ---
| 
|  drivers/cdrom/cdrom.c |  274 ++++++++++++++++++++++++++++++++-----------------
|  1 files changed, 181 insertions(+), 93 deletions(-)
| 
[...]

Hi Thomas,

maybe would be better to use one memory pool instead?

		- Cyrill -
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