[PATCH 08/15] btrfs: cleanup btrfs_rm_device() use cur_devices

[Anand Jain <anand.jain@oracle.com>]

Instead of de-referencing the device->fs_devices use cur_devices
which points to the same fs_devices.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
---
 fs/btrfs/volumes.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index db077c505fe0..29799d39554a 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -1987,20 +1987,25 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
 	 * (super_copy) should hold the device list mutex.
 	 */
 
+	/*
+	 * In normal cases the cur_devices == fs_devices. But in case
+	 * of deleting a seed device, the cur_devices should point to
+	 * its own fs_devices listed under the fs_devices->seed.
+	 */
 	cur_devices = device->fs_devices;
 	mutex_lock(&fs_devices->device_list_mutex);
 	list_del_rcu(&device->dev_list);
 
-	device->fs_devices->num_devices--;
-	device->fs_devices->total_devices--;
+	cur_devices->num_devices--;
+	cur_devices->total_devices--;
 
 	if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
-		device->fs_devices->missing_devices--;
+		cur_devices->missing_devices--;
 
 	btrfs_assign_next_active_device(fs_info, device, NULL);
 
 	if (device->bdev) {
-		device->fs_devices->open_devices--;
+		cur_devices->open_devices--;
 		/* remove sysfs entry */
 		btrfs_sysfs_rm_device_link(fs_devices, device);
 	}
-- 
2.7.0