From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Wed, 16 Jul 2008 18:33:35 +0000 (+0200)
Subject: ide: avoid DMA on the stack for REQ_TYPE_ATA_PC
X-Git-Tag: v2.6.27-rc1~1049^2~74
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0b6abc17700a7843b165c677da0ac94522f83083;p=pandora-kernel.git

ide: avoid DMA on the stack for REQ_TYPE_ATA_PC

Some REQ_TYPE_ATA_PC commands uses the stack buffers for DMA, which
leads to memory corruption on a non-coherent platform.

With regard to alignment and padding, ide-cd has the the dma safe
check for sg requests and REQ_TYPE_ATA_PC. This adds the stack buffer
check to that check.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Borislav Petkov <petkovbb@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Tejun Heo <htejun@gmail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---

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