summaryrefslogtreecommitdiff
path: root/drivers/md/raid10.c
diff options
context:
space:
mode:
authorNeilBrown <neilb@suse.de>2011-09-10 11:20:21 +0400
committerNeilBrown <neilb@suse.de>2011-09-10 11:20:21 +0400
commit94007751bb02797ba87bac7aacee2731ac2039a3 (patch)
treeac45ec9aef327e0a77f3ffd8c09eff9ef1609f95 /drivers/md/raid10.c
parent43220aa0f22cd3ce5b30246d50ccd696d119edea (diff)
downloadlinux-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