Commit f41d427c authored by Marcin Dziegielewski's avatar Marcin Dziegielewski Committed by Jens Axboe

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: default avatarMarcin Dziegielewski <marcin.dziegielewski@intel.com>
Reviewed-by: default avatarJavier González <javier@javigon.com>
Signed-off-by: default avatarMatias Bjørling <mb@lightnvm.io>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 4bbae699
......@@ -1340,11 +1340,13 @@ static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
return -EINVAL;
}
down_read(&nvm_lock);
list_for_each_entry(dev, &nvm_devices, devices) {
ret = nvm_remove_tgt(dev, &remove);
if (!ret)
break;
}
up_read(&nvm_lock);
return ret;
}
......
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