genirq/msi: Convert to new functions

Use the new iterator functions and add locking where required.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Kelley <mikelley@microsoft.com>
Tested-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211206210749.063705667@linutronix.de

Author: KAGA-KOKO

kernel/irq/msi.c

@@ -320,29 +320,34 @@ EXPORT_SYMBOL_GPL(msi_next_desc);
 unsigned int msi_get_virq(struct device *dev, unsigned int index)
 {
 	struct msi_desc *desc;
+	unsigned int ret = 0;
 	bool pcimsi;
 
 	if (!dev->msi.data)
 		return 0;
 
 	pcimsi = dev_is_pci(dev) ? to_pci_dev(dev)->msi_enabled : false;
 
-	for_each_msi_entry(desc, dev) {
+	msi_lock_descs(dev);
+	msi_for_each_desc(desc, dev, MSI_DESC_ASSOCIATED) {
 		/* PCI-MSI has only one descriptor for multiple interrupts. */
 		if (pcimsi) {
-			if (desc->irq && index < desc->nvec_used)
-				return desc->irq + index;
+			if (index < desc->nvec_used)
+				ret = desc->irq + index;
 			break;
 		}
 
 		/*
 		 * PCI-MSIX and platform MSI use a descriptor per
 		 * interrupt.
 		 */
-		if (desc->msi_index == index)
-			return desc->irq;
+		if (desc->msi_index == index) {
+			ret = desc->irq;
+			break;
+		}
 	}
-	return 0;
+	msi_unlock_descs(dev);
+	return ret;
 }
 EXPORT_SYMBOL_GPL(msi_get_virq);
 
@@ -373,7 +378,7 @@ static const struct attribute_group **msi_populate_sysfs(struct device *dev)
 	int i;
 
 	/* Determine how many msi entries we have */
-	for_each_msi_entry(entry, dev)
+	msi_for_each_desc(entry, dev, MSI_DESC_ALL)
 		num_msi += entry->nvec_used;
 	if (!num_msi)
 		return NULL;
@@ -383,7 +388,7 @@ static const struct attribute_group **msi_populate_sysfs(struct device *dev)
 	if (!msi_attrs)
 		return ERR_PTR(-ENOMEM);
 
-	for_each_msi_entry(entry, dev) {
+	msi_for_each_desc(entry, dev, MSI_DESC_ALL) {
 		for (i = 0; i < entry->nvec_used; i++) {
 			msi_dev_attr = kzalloc(sizeof(*msi_dev_attr), GFP_KERNEL);
 			if (!msi_dev_attr)
@@ -803,7 +808,7 @@ static bool msi_check_reservation_mode(struct irq_domain *domain,
 	 * Checking the first MSI descriptor is sufficient. MSIX supports
 	 * masking and MSI does so when the can_mask attribute is set.
 	 */
-	desc = first_msi_entry(dev);
+	desc = msi_first_desc(dev, MSI_DESC_ALL);
 	return desc->pci.msi_attrib.is_msix || desc->pci.msi_attrib.can_mask;
 }