tree 9d817f12f4ecfa480ac1cc3b471af31837b30c8c
parent f0e47138b26bd26d312aa63522a579acac5552c6
author Hannes Reinecke <hare@suse.de> 1317218821 -0600
committer Greg Kroah-Hartman <gregkh@suse.de> 1317667273 -0700

block: Free queue resources at blk_release_queue()

commit 777eb1bf15b8532c396821774bf6451e563438f5 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>