tree ed0a0c9368e06db907c7d0e58dddf27df7fe0558
parent 39a169b62b415390398291080dafe63aec751e0a
author Matias Bjørling <m@bjorling.me> 1455198553 +0100
committer Jens Axboe <axboe@fb.com> 1455206169 -0700

null_blk: oops when initializing without lightnvm

If the LightNVM subsystem is not compiled into the kernel, and the
null_blk device driver requests lightnvm to be initialized. The call to
nvm_register fails and the null_add_dev function cleans up the
initialization. However, at this point the null block device has
already been added to the nullb_list and thus a second cleanup will
occur when the function has returned, that leads to a double call to
blk_cleanup_queue.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>