From: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Date: Fri, 4 Jul 2008 07:31:11 +0000 (+0200)
Subject: block: blk_rq_map_kern uses the bounce buffers for stack buffers
X-Git-Tag: v2.6.27-rc1~1114^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=30c00eda73d5db5bd64dd0c370161abd8df5ba4a;p=pandora-kernel.git

block: blk_rq_map_kern uses the bounce buffers for stack buffers

blk_rq_map_kern is used for kernel internal I/Os. Some callers use
this function with stack buffers but DMA to/from the stack buffers
leads to memory corruption on a non-coherent platform.

This patch make blk_rq_map_kern uses the bounce buffers if a caller
passes a stack buffer (on the all platforms for simplicity).

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

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