Merge tag 'block-6.12-20241108' of git://git.kernel.dk/linux

Pull block fix from Jens Axboe:
 "Single fix for an issue triggered with PROVE_RCU=y, with nvme using
  the wrong iterators for an SRCU protected list"

* tag 'block-6.12-20241108' of git://git.kernel.dk/linux:
  nvme/host: Fix RCU list traversal to use SRCU primitive

Author: torvalds

drivers/nvme/host/core.c

@@ -3795,7 +3795,8 @@ struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	int srcu_idx;
 
 	srcu_idx = srcu_read_lock(&ctrl->srcu);
-	list_for_each_entry_rcu(ns, &ctrl->namespaces, list) {
+	list_for_each_entry_srcu(ns, &ctrl->namespaces, list,
+				 srcu_read_lock_held(&ctrl->srcu)) {
 		if (ns->head->ns_id == nsid) {
 			if (!nvme_get_ns(ns))
 				continue;
@@ -4879,7 +4880,8 @@ void nvme_mark_namespaces_dead(struct nvme_ctrl *ctrl)
 	int srcu_idx;
 
 	srcu_idx = srcu_read_lock(&ctrl->srcu);
-	list_for_each_entry_rcu(ns, &ctrl->namespaces, list)
+	list_for_each_entry_srcu(ns, &ctrl->namespaces, list,
+				 srcu_read_lock_held(&ctrl->srcu))
 		blk_mark_disk_dead(ns->disk);
 	srcu_read_unlock(&ctrl->srcu, srcu_idx);
 }
@@ -4891,7 +4893,8 @@ void nvme_unfreeze(struct nvme_ctrl *ctrl)
 	int srcu_idx;
 
 	srcu_idx = srcu_read_lock(&ctrl->srcu);
-	list_for_each_entry_rcu(ns, &ctrl->namespaces, list)
+	list_for_each_entry_srcu(ns, &ctrl->namespaces, list,
+				 srcu_read_lock_held(&ctrl->srcu))
 		blk_mq_unfreeze_queue(ns->queue);
 	srcu_read_unlock(&ctrl->srcu, srcu_idx);
 	clear_bit(NVME_CTRL_FROZEN, &ctrl->flags);
@@ -4904,7 +4907,8 @@ int nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout)
 	int srcu_idx;
 
 	srcu_idx = srcu_read_lock(&ctrl->srcu);
-	list_for_each_entry_rcu(ns, &ctrl->namespaces, list) {
+	list_for_each_entry_srcu(ns, &ctrl->namespaces, list,
+				 srcu_read_lock_held(&ctrl->srcu)) {
 		timeout = blk_mq_freeze_queue_wait_timeout(ns->queue, timeout);
 		if (timeout <= 0)
 			break;
@@ -4920,7 +4924,8 @@ void nvme_wait_freeze(struct nvme_ctrl *ctrl)
 	int srcu_idx;
 
 	srcu_idx = srcu_read_lock(&ctrl->srcu);
-	list_for_each_entry_rcu(ns, &ctrl->namespaces, list)
+	list_for_each_entry_srcu(ns, &ctrl->namespaces, list,
+				 srcu_read_lock_held(&ctrl->srcu))
 		blk_mq_freeze_queue_wait(ns->queue);
 	srcu_read_unlock(&ctrl->srcu, srcu_idx);
 }
@@ -4933,7 +4938,8 @@ void nvme_start_freeze(struct nvme_ctrl *ctrl)
 
 	set_bit(NVME_CTRL_FROZEN, &ctrl->flags);
 	srcu_idx = srcu_read_lock(&ctrl->srcu);
-	list_for_each_entry_rcu(ns, &ctrl->namespaces, list)
+	list_for_each_entry_srcu(ns, &ctrl->namespaces, list,
+				 srcu_read_lock_held(&ctrl->srcu))
 		blk_freeze_queue_start(ns->queue);
 	srcu_read_unlock(&ctrl->srcu, srcu_idx);
 }
@@ -4981,7 +4987,8 @@ void nvme_sync_io_queues(struct nvme_ctrl *ctrl)
 	int srcu_idx;
 
 	srcu_idx = srcu_read_lock(&ctrl->srcu);
-	list_for_each_entry_rcu(ns, &ctrl->namespaces, list)
+	list_for_each_entry_srcu(ns, &ctrl->namespaces, list,
+				 srcu_read_lock_held(&ctrl->srcu))
 		blk_sync_queue(ns->queue);
 	srcu_read_unlock(&ctrl->srcu, srcu_idx);
 }