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| author | NeilBrown <neilb@suse.de> | 2011-02-21 18:25:57 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2011-02-21 18:25:57 +1100 |
| commit | da9cf5050a2e3dbc3cf26a8d908482eb4485ed49 (patch) | |
| tree | d5e7ea4ef419d07d294e88b47a4aaf2676a605eb /drivers/md/multipath.c | |
| parent | 8f5f02c460b7ca74ce55ce126ce0c1e58a3f923d (diff) | |
| download | linux-da9cf5050a2e3dbc3cf26a8d908482eb4485ed49.tar.gz linux-da9cf5050a2e3dbc3cf26a8d908482eb4485ed49.tar.bz2 linux-da9cf5050a2e3dbc3cf26a8d908482eb4485ed49.zip | |
md: avoid spinlock problem in blk_throtl_exit
blk_throtl_exit assumes that ->queue_lock still exists,
so make sure that it does.
To do this, we stop redirecting ->queue_lock to conf->device_lock
and leave it pointing where it is initialised - __queue_lock.
As the blk_plug functions check the ->queue_lock is held, we now
take that spin_lock explicitly around the plug functions. We don't
need the locking, just the warning removal.
This is needed for any kernel with the blk_throtl code, which is
which is 2.6.37 and later.
Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/multipath.c')
| -rw-r--r-- | drivers/md/multipath.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c index 6d7ddf32ef2e..3a62d440e27b 100644 --- a/drivers/md/multipath.c +++ b/drivers/md/multipath.c @@ -435,7 +435,6 @@ static int multipath_run (mddev_t *mddev) * bookkeeping area. [whatever we allocate in multipath_run(), * should be freed in multipath_stop()] */ - mddev->queue->queue_lock = &mddev->queue->__queue_lock; conf = kzalloc(sizeof(multipath_conf_t), GFP_KERNEL); mddev->private = conf; |