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| author | Hannes Reinecke <hare@suse.de> | 2011-09-28 08:07:01 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2011-09-28 08:07:01 -0600 |
| commit | 777eb1bf15b8532c396821774bf6451e563438f5 (patch) | |
| tree | 8363e63bae76eb049f4c8d0460ef8e1f74f0ca91 /block/blk-sysfs.c | |
| parent | a102a9ece5489e1718cd7543aa079082450ac3a2 (diff) | |
| download | lwn-777eb1bf15b8532c396821774bf6451e563438f5.tar.gz lwn-777eb1bf15b8532c396821774bf6451e563438f5.zip | |
block: Free queue resources at blk_release_queue()
A kernel crash is observed when a mounted ext3/ext4 filesystem is
physically removed. The problem is that blk_cleanup_queue() frees up
some resources eg by calling elevator_exit(), which are not checked for
in normal operation. So we should rather move these calls to the
destructor function blk_release_queue() as at that point all remaining
references are gone. However, in doing so we have to ensure that any
externally supplied queue_lock is disconnected as the driver might free
up the lock after the call of blk_cleanup_queue(),
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-sysfs.c')
| -rw-r--r-- | block/blk-sysfs.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index e681805cdb47..60fda88c57f0 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -479,6 +479,11 @@ static void blk_release_queue(struct kobject *kobj) blk_sync_queue(q); + if (q->elevator) + elevator_exit(q->elevator); + + blk_throtl_exit(q); + if (rl->rq_pool) mempool_destroy(rl->rq_pool); |