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lightnvm: prevent race condition on pblk remove

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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>
This commit is contained in:
Marcin Dziegielewski 2019-05-04 20:37:58 +02:00 committed by Jens Axboe
parent 4bbae69922
commit f41d427cdd
1 changed files with 2 additions and 0 deletions
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2
drivers/lightnvm/core.c
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@ -1340,11 +1340,13 @@ static long nvm_ioctl_dev_remove(struct file *file, void __user *arg)
return -EINVAL; return -EINVAL;
} }
down_read(&nvm_lock);
list_for_each_entry(dev, &nvm_devices, devices) { list_for_each_entry(dev, &nvm_devices, devices) {
ret = nvm_remove_tgt(dev, &remove); ret = nvm_remove_tgt(dev, &remove);
if (!ret) if (!ret)
break; break;
} }
up_read(&nvm_lock);
return ret; return ret;
} }