[PATCH] nvme-multipath: pass NS head to nvme_mpath_revalidate_paths()

[John Garry]

In nvme_mpath_revalidate_paths(), we are passed a NS pointer and use that
to lookup the NS head and then use that same NS pointer as an iter variable.

It makes more sense pass the NS head and use a local variable for the NS
iter.

Signed-off-by: John Garry <john.g.garry at oracle.com>

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 5d8af8aa472e6..f69e3115d8cf9 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2567,7 +2567,7 @@ static int nvme_update_ns_info(struct nvme_ns *ns, struct nvme_ns_info *info)
 
 		set_capacity_and_notify(ns->head->disk, get_capacity(ns->disk));
 		set_disk_ro(ns->head->disk, nvme_ns_is_readonly(ns, info));
-		nvme_mpath_revalidate_paths(ns);
+		nvme_mpath_revalidate_paths(ns->head);
 
 		blk_mq_unfreeze_queue(ns->head->disk->queue, memflags);
 	}
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 263161cb8ac06..e00e2842df307 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -254,10 +254,10 @@ void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl)
 	srcu_read_unlock(&ctrl->srcu, srcu_idx);
 }
 
-void nvme_mpath_revalidate_paths(struct nvme_ns *ns)
+void nvme_mpath_revalidate_paths(struct nvme_ns_head *head)
 {
-	struct nvme_ns_head *head = ns->head;
 	sector_t capacity = get_capacity(head->disk);
+	struct nvme_ns *ns;
 	int node;
 	int srcu_idx;
 
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 9ccaed0b9dbf1..86b09c06b9e0a 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -1043,7 +1043,7 @@ void nvme_mpath_update(struct nvme_ctrl *ctrl);
 void nvme_mpath_uninit(struct nvme_ctrl *ctrl);
 void nvme_mpath_stop(struct nvme_ctrl *ctrl);
 bool nvme_mpath_clear_current_path(struct nvme_ns *ns);
-void nvme_mpath_revalidate_paths(struct nvme_ns *ns);
+void nvme_mpath_revalidate_paths(struct nvme_ns_head *head);
 void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl);
 void nvme_mpath_remove_disk(struct nvme_ns_head *head);
 void nvme_mpath_start_request(struct request *rq);
@@ -1108,7 +1108,7 @@ static inline bool nvme_mpath_clear_current_path(struct nvme_ns *ns)
 {
 	return false;
 }
-static inline void nvme_mpath_revalidate_paths(struct nvme_ns *ns)
+static inline void nvme_mpath_revalidate_paths(struct nvme_ns_head *head)
 {
 }
 static inline void nvme_mpath_clear_ctrl_paths(struct nvme_ctrl *ctrl)
-- 
2.43.5