Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-23 04:31:50 +00:00
Code Issues Packages Projects Releases Wiki Activity

lightnvm: prevent race condition on pblk remove

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/lightnvm/core.c
View File

@ -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;
}