tree 1aed7dc560df36157d8cde6fdebc1d86f4ed61ad
parent f6302f1bcd75a042df69866d98b8d775a668f8f1
author Tejun Heo <tj@kernel.org> 1328960245 +0100
committer Jens Axboe <axboe@kernel.dk> 1328960245 +0100

block: fix lockdep warning on io_context release put_io_context()

11a3122f6c "block: strip out locking optimization in put_io_context()"
removed ioc_lock depth lockdep annoation along with locking
optimization; however, while recursing from put_io_context() is no
longer possible, ioc_release_fn() may still end up putting the last
reference of another ioc through elevator, which wlil grab ioc->lock
triggering spurious (as the ioc is always different one) A-A deadlock
warning.

As this can only happen one time from ioc_release_fn(), using non-zero
subclass from ioc_release_fn() is enough.  Use subclass 1.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>