block-6.16-20250704

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Merge tag 'block-6.16-20250704' of git://git.kernel.dk/linux

Pull block fixes from Jens Axboe:

 - NVMe fixes via Christoph:
     - fix incorrect cdw15 value in passthru error logging (Alok Tiwari)
     - fix memory leak of bio integrity in nvmet (Dmitry Bogdanov)
     - refresh visible attrs after being checked (Eugen Hristev)
     - fix suspicious RCU usage warning in the multipath code (Geliang Tang)
     - correctly account for namespace head reference counter (Nilay Shroff)

 - Fix for a regression introduced in ublk in this cycle, where it would
   attempt to queue a canceled request.

 - brd RCU sleeping fix, also introduced in this cycle. Bare bones fix,
   should be improved upon for the next release.

* tag 'block-6.16-20250704' of git://git.kernel.dk/linux:
  brd: fix sleeping function called from invalid context in brd_insert_page()
  ublk: don't queue request if the associated uring_cmd is canceled
  nvme-multipath: fix suspicious RCU usage warning
  nvme-pci: refresh visible attrs after being checked
  nvmet: fix memory leak of bio integrity
  nvme: correctly account for namespace head reference counter
  nvme: Fix incorrect cdw15 value in passthru error logging

drivers/block/brd.c

@@ -64,13 +64,15 @@ static struct page *brd_insert_page(struct brd_device *brd, sector_t sector,
 
 	rcu_read_unlock();
 	page = alloc_page(gfp | __GFP_ZERO | __GFP_HIGHMEM);
-	rcu_read_lock();
-	if (!page)
+	if (!page) {
+		rcu_read_lock();
 		return ERR_PTR(-ENOMEM);
+	}
 
 	xa_lock(&brd->brd_pages);
 	ret = __xa_cmpxchg(&brd->brd_pages, sector >> PAGE_SECTORS_SHIFT, NULL,
 			page, gfp);
+	rcu_read_lock();
 	if (ret) {
 		xa_unlock(&brd->brd_pages);
 		__free_page(page);

drivers/block/ublk_drv.c

@@ -1442,15 +1442,16 @@ static void ublk_queue_rqs(struct rq_list *rqlist)
 		struct ublk_queue *this_q = req->mq_hctx->driver_data;
 		struct ublk_io *this_io = &this_q->ios[req->tag];
 
+		if (ublk_prep_req(this_q, req, true) != BLK_STS_OK) {
+			rq_list_add_tail(&requeue_list, req);
+			continue;
+		}
+
 		if (io && !ublk_belong_to_same_batch(io, this_io) &&
 				!rq_list_empty(&submit_list))
 			ublk_queue_cmd_list(io, &submit_list);
 		io = this_io;
-
-		if (ublk_prep_req(this_q, req, true) == BLK_STS_OK)
-			rq_list_add_tail(&submit_list, req);
-		else
-			rq_list_add_tail(&requeue_list, req);
+		rq_list_add_tail(&submit_list, req);
 	}
 
 	if (!rq_list_empty(&submit_list))

drivers/nvme/host/core.c

@@ -386,7 +386,7 @@ static void nvme_log_err_passthru(struct request *req)
 		nr->cmd->common.cdw12,
 		nr->cmd->common.cdw13,
 		nr->cmd->common.cdw14,
-		nr->cmd->common.cdw14);
+		nr->cmd->common.cdw15);
 }
 
 enum nvme_disposition {
@@ -4086,6 +4086,7 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, struct nvme_ns_info *info)
 	struct nvme_ns *ns;
 	struct gendisk *disk;
 	int node = ctrl->numa_node;
+	bool last_path = false;
 
 	ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node);
 	if (!ns)
@@ -4178,9 +4179,22 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, struct nvme_ns_info *info)
  out_unlink_ns:
 	mutex_lock(&ctrl->subsys->lock);
 	list_del_rcu(&ns->siblings);
-	if (list_empty(&ns->head->list))
+	if (list_empty(&ns->head->list)) {
 		list_del_init(&ns->head->entry);
+		/*
+		 * If multipath is not configured, we still create a namespace
+		 * head (nshead), but head->disk is not initialized in that
+		 * case.  As a result, only a single reference to nshead is held
+		 * (via kref_init()) when it is created. Therefore, ensure that
+		 * we do not release the reference to nshead twice if head->disk
+		 * is not present.
+		 */
+		if (ns->head->disk)
+			last_path = true;
+	}
 	mutex_unlock(&ctrl->subsys->lock);
+	if (last_path)
+		nvme_put_ns_head(ns->head);
 	nvme_put_ns_head(ns->head);
  out_cleanup_disk:
 	put_disk(disk);

drivers/nvme/host/multipath.c

@@ -690,8 +690,8 @@ static void nvme_remove_head(struct nvme_ns_head *head)
 		nvme_cdev_del(&head->cdev, &head->cdev_device);
 		synchronize_srcu(&head->srcu);
 		del_gendisk(head->disk);
-		nvme_put_ns_head(head);
 	}
+	nvme_put_ns_head(head);
 }
 
 static void nvme_remove_head_work(struct work_struct *work)
@@ -1200,7 +1200,8 @@ void nvme_mpath_add_sysfs_link(struct nvme_ns_head *head)
 	 */
 	srcu_idx = srcu_read_lock(&head->srcu);
 
-	list_for_each_entry_rcu(ns, &head->list, siblings) {
+	list_for_each_entry_srcu(ns, &head->list, siblings,
+				 srcu_read_lock_held(&head->srcu)) {
 		/*
 		 * Ensure that ns path disk node is already added otherwise we
 		 * may get invalid kobj name for target
@@ -1291,6 +1292,9 @@ void nvme_mpath_remove_disk(struct nvme_ns_head *head)
 {
 	bool remove = false;
 
+	if (!head->disk)
+		return;
+
 	mutex_lock(&head->subsys->lock);
 	/*
 	 * We are called when all paths have been removed, and at that point

drivers/nvme/host/pci.c

@@ -2101,8 +2101,6 @@ static void nvme_map_cmb(struct nvme_dev *dev)
 	if ((dev->cmbsz & (NVME_CMBSZ_WDS | NVME_CMBSZ_RDS)) ==
 			(NVME_CMBSZ_WDS | NVME_CMBSZ_RDS))
 		pci_p2pmem_publish(pdev, true);
-
-	nvme_update_attrs(dev);
 }
 
 static int nvme_set_host_mem(struct nvme_dev *dev, u32 bits)
@@ -3010,6 +3008,8 @@ static void nvme_reset_work(struct work_struct *work)
 	if (result < 0)
 		goto out;
 
+	nvme_update_attrs(dev);
+
 	result = nvme_setup_io_queues(dev);
 	if (result)
 		goto out;
@@ -3343,6 +3343,8 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (result < 0)
 		goto out_disable;
 
+	nvme_update_attrs(dev);
+
 	result = nvme_setup_io_queues(dev);
 	if (result)
 		goto out_disable;

drivers/nvme/target/nvmet.h

@@ -867,6 +867,8 @@ static inline void nvmet_req_bio_put(struct nvmet_req *req, struct bio *bio)
 {
 	if (bio != &req->b.inline_bio)
 		bio_put(bio);
+	else
+		bio_uninit(bio);
 }
 
 #ifdef CONFIG_NVME_TARGET_TCP_TLS