NTB/msi: Convert to msi_on_each_desc()

Replace the about to vanish iterators, make use of the filtering and take
the descriptor lock around the iteration.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211206210748.683004012@linutronix.de

drivers/ntb/msi.c

@@ -108,8 +108,10 @@ int ntb_msi_setup_mws(struct ntb_dev *ntb)
 	if (!ntb->msi)
 		return -EINVAL;
 
-	desc = first_msi_entry(&ntb->pdev->dev);
+	msi_lock_descs(&ntb->pdev->dev);
+	desc = msi_first_desc(&ntb->pdev->dev, MSI_DESC_ASSOCIATED);
 	addr = desc->msg.address_lo + ((uint64_t)desc->msg.address_hi << 32);
+	msi_unlock_descs(&ntb->pdev->dev);
 
 	for (peer = 0; peer < ntb_peer_port_count(ntb); peer++) {
 		peer_widx = ntb_peer_highest_mw_idx(ntb, peer);
@@ -281,13 +283,15 @@ int ntbm_msi_request_threaded_irq(struct ntb_dev *ntb, irq_handler_t handler,
 				  const char *name, void *dev_id,
 				  struct ntb_msi_desc *msi_desc)
 {
+	struct device *dev = &ntb->pdev->dev;
 	struct msi_desc *entry;
 	int ret;
 
 	if (!ntb->msi)
 		return -EINVAL;
 
-	for_each_pci_msi_entry(entry, ntb->pdev) {
+	msi_lock_descs(dev);
+	msi_for_each_desc(entry, dev, MSI_DESC_ASSOCIATED) {
 		if (irq_has_action(entry->irq))
 			continue;
 
@@ -304,14 +308,17 @@ int ntbm_msi_request_threaded_irq(struct ntb_dev *ntb, irq_handler_t handler,
 		ret = ntbm_msi_setup_callback(ntb, entry, msi_desc);
 		if (ret) {
 			devm_free_irq(&ntb->dev, entry->irq, dev_id);
-			return ret;
+			goto unlock;
 		}
 
-
-		return entry->irq;
+		ret = entry->irq;
+		goto unlock;
 	}
+	ret = -ENODEV;
 
-	return -ENODEV;
+unlock:
+	msi_unlock_descs(dev);
+	return ret;
 }
 EXPORT_SYMBOL(ntbm_msi_request_threaded_irq);