tree 87b5a34323eb98edf504e51b2d8e0291559579e3
parent 27f8221af406e43b529a5425bc99c9b1e9bdf521
author FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> 1215156671 +0200
committer Jens Axboe <jens.axboe@oracle.com> 1215157933 +0200

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>