block: avoid setting none scheduler if it's already none
authorAleksei Zakharov <zakharov.a.g@yandex.ru>
Mon, 11 Feb 2019 10:50:37 +0000 (13:50 +0300)
committerJens Axboe <axboe@kernel.dk>
Mon, 11 Feb 2019 15:21:40 +0000 (08:21 -0700)
commitfbd72127c975dc8e532ecc73d52f3b1b00935bec
tree43817ee93cf8c5baca17958ec6d93c5e4fe7d1a6
parentb7143fe67bfc3b83a9e11371da659e1e70a1bbf3
block: avoid setting none scheduler if it's already none

There's no reason to freeze queue and remove scheduler
if there's no scheduler already.

Signed-off-by: Aleksei Zakharov <zakharov.a.g@yandex.ru>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
block/elevator.c