• Hannes Reinecke's avatar
    block: Free queue resources at blk_release_queue() · 777eb1bf
    Hannes Reinecke authored
    
    
    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: default avatarHannes Reinecke <hare@suse.de>
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    777eb1bf