tree 9f245a022542d626c948ebfb886106ce3f7e62ae
parent 5676e7b6db02b80eafc2e3ad316d5f2fee817ecb
author Keith Busch <keith.busch@intel.com> 1409065536 -0600
committer Jens Axboe <axboe@fb.com> 1409778062 -0600

block: Fix dev_t minor allocation lifetime

Releases the dev_t minor when all references are closed to prevent
another device from acquiring the same major/minor.

Since the partition's release may be invoked from call_rcu's soft-irq
context, the ext_dev_idr's mutex had to be replaced with a spinlock so
as not so sleep.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Cc: stable@kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>