block: simplify ioc_release_fn()
Reverse double lock dancing in ioc_release_fn() can be simplified by just using trylock on the queue_lock and back out from ioc lock on trylock failure. Simplify it. Signed-off-by: NTejun Heo <tj@kernel.org> Tested-by: NShaohua Li <shaohua.li@intel.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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