lightnvm: prevent race condition on pblk remove
When we trigger nvm target remove during device hot unplug, there is a probability to hit a general protection fault. This is caused by use of nvm_dev thay may be freed from another (hot unplug) thread (in the nvm_unregister function). Introduce lock in nvme_ioctl_dev_remove function to prevent this situation. Signed-off-by: Marcin Dziegielewski <marcin.dziegielewski@intel.com> Reviewed-by: Javier González <javier@javigon.com> Signed-off-by: Matias Bjørling <mb@lightnvm.io> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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