Commit 1cba0cdf authored by Thomas Gleixner's avatar Thomas Gleixner Committed by Chris Mason

btrfs: Init io_lock after cloning btrfs device struct

__btrfs_close_devices() clones btrfs device structs with
memcpy(). Some of the fields in the clone are reinitialized, but it's
missing to init io_lock. In mainline this goes unnoticed, but on RT it
leaves the plist pointing to the original about to be freed lock
struct.

Initialize io_lock after cloning, so no references to the original
struct are left.
Reported-and-tested-by: default avatarMike Galbraith <efault@gmx.de>
Cc: stable@vger.kernel.org
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarChris Mason <chris.mason@fusionio.com>
parent e942f883
......@@ -650,6 +650,7 @@ static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
new_device->writeable = 0;
new_device->in_fs_metadata = 0;
new_device->can_discard = 0;
spin_lock_init(&new_device->io_lock);
list_replace_rcu(&device->dev_list, &new_device->dev_list);
call_rcu(&device->rcu, free_device);
......
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