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authorGary King <gking@nvidia.com>2010-09-09 16:38:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-09-09 18:57:25 -0700
commitac8456d6f9a3011c824176bd6084d39e5f70a382 (patch)
tree8973f7b5f9993d34d0301380972475dca2410afd /mm/bounce.c
parent47016434257b90445113eed1c5b8b57eb2d35330 (diff)
downloadlinux-ac8456d6f9a3011c824176bd6084d39e5f70a382.tar.gz
bounce: call flush_dcache_page() after bounce_copy_vec()
I have been seeing problems on Tegra 2 (ARMv7 SMP) systems with HIGHMEM enabled on 2.6.35 (plus some patches targetted at 2.6.36 to perform cache maintenance lazily), and the root cause appears to be that the mm bouncing code is calling flush_dcache_page before it copies the bounce buffer into the bio. The bounced page needs to be flushed after data is copied into it, to ensure that architecture implementations can synchronize instruction and data caches if necessary. Signed-off-by: Gary King <gking@nvidia.com> Cc: Tejun Heo <tj@kernel.org> Cc: Russell King <rmk@arm.linux.org.uk> Acked-by: Jens Axboe <axboe@kernel.dk> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/bounce.c')
-rw-r--r--mm/bounce.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/bounce.c b/mm/bounce.c
index 13b6dad1eed..1481de68184 100644
--- a/mm/bounce.c
+++ b/mm/bounce.c
@@ -116,8 +116,8 @@ static void copy_to_high_bio_irq(struct bio *to, struct bio *from)
*/
vfrom = page_address(fromvec->bv_page) + tovec->bv_offset;
- flush_dcache_page(tovec->bv_page);
bounce_copy_vec(tovec, vfrom);
+ flush_dcache_page(tovec->bv_page);
}
}