From f41d427cdd9ec379e35777d13622c3cd382bf0a2 Mon Sep 17 00:00:00 2001 From: Marcin Dziegielewski Date: Sat, 4 May 2019 20:37:58 +0200 Subject: lightnvm: prevent race condition on pblk remove MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Javier González Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/core.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/lightnvm') diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c index c01f83b8fbaf..e2abe88a139c 100644 --- a/drivers/lightnvm/core.c +++ b/drivers/lightnvm/core.c @@ -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; } -- cgit v1.2.3-70-g09d2