nvme-pci: refresh visible attrs for cmb attributes

The sysfs group containing the cmb attributes is registered before the
driver knows if they need to be visible or not. Update the group when
cmb attributes are known to exist so the visibility setting is correct.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=217037
Fixes: 86adbf0c ("nvme: simplify transport specific device attribute handling")
Signed-off-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/nvme/host/pci.c

@@ -110,6 +110,7 @@ struct nvme_queue;
 
 static void nvme_dev_disable(struct nvme_dev *dev, bool shutdown);
 static void nvme_delete_io_queues(struct nvme_dev *dev);
+static void nvme_update_attrs(struct nvme_dev *dev);
 
 /*
  * Represents an NVM Express device.  Each nvme_dev is a PCI function.
@@ -1923,6 +1924,8 @@ 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)
@@ -2209,6 +2212,11 @@ static const struct attribute_group *nvme_pci_dev_attr_groups[] = {
 	NULL,
 };
 
+static void nvme_update_attrs(struct nvme_dev *dev)
+{
+	sysfs_update_group(&dev->ctrl.device->kobj, &nvme_pci_dev_attrs_group);
+}
+
 /*
  * nirqs is the number of interrupts available for write and read
  * queues. The core already reserved an interrupt for the admin queue.