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author | NeilBrown <neilb@suse.de> | 2011-09-10 11:20:21 +0400 |
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committer | NeilBrown <neilb@suse.de> | 2011-09-10 11:20:21 +0400 |
commit | 94007751bb02797ba87bac7aacee2731ac2039a3 (patch) | |
tree | ac45ec9aef327e0a77f3ffd8c09eff9ef1609f95 /drivers/md/raid10.c | |
parent | 43220aa0f22cd3ce5b30246d50ccd696d119edea (diff) | |
download | linux-94007751bb02797ba87bac7aacee2731ac2039a3.tar.xz |
Avoid dereferencing a 'request_queue' after last close.
On the last close of an 'md' device which as been stopped, the device
is destroyed and in particular the request_queue is freed. The free
is done in a separate thread so it might happen a short time later.
__blkdev_put calls bdev_inode_switch_bdi *after* ->release has been
called.
Since commit f758eeabeb96f878c860e8f110f94ec8820822a9
bdev_inode_switch_bdi will dereference the 'old' bdi, which lives
inside a request_queue, to get a spin lock. This causes the last
close on an md device to sometime take a spin_lock which lives in
freed memory - which results in an oops.
So move the called to bdev_inode_switch_bdi before the call to
->release.
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Acked-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/raid10.c')
0 files changed, 0 insertions, 0 deletions