PCI/MSI: Use guard(msi_desc_lock) where applicable

Convert the trivial cases of msi_desc_lock/unlock() pairs.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/all/20250319105506.322536126@linutronix.de

Author: KAGA-KOKO

drivers/pci/msi/api.c

@@ -53,10 +53,9 @@ void pci_disable_msi(struct pci_dev *dev)
 	if (!pci_msi_enabled() || !dev || !dev->msi_enabled)
 		return;
 
-	msi_lock_descs(&dev->dev);
+	guard(msi_descs_lock)(&dev->dev);
 	pci_msi_shutdown(dev);
 	pci_free_msi_irqs(dev);
-	msi_unlock_descs(&dev->dev);
 }
 EXPORT_SYMBOL(pci_disable_msi);
 
@@ -196,10 +195,9 @@ void pci_disable_msix(struct pci_dev *dev)
 	if (!pci_msi_enabled() || !dev || !dev->msix_enabled)
 		return;
 
-	msi_lock_descs(&dev->dev);
+	guard(msi_descs_lock)(&dev->dev);
 	pci_msix_shutdown(dev);
 	pci_free_msi_irqs(dev);
-	msi_unlock_descs(&dev->dev);
 }
 EXPORT_SYMBOL(pci_disable_msix);
 

drivers/pci/msi/msi.c

@@ -870,13 +870,13 @@ void __pci_restore_msix_state(struct pci_dev *dev)
 
 	write_msg = arch_restore_msi_irqs(dev);
 
-	msi_lock_descs(&dev->dev);
-	msi_for_each_desc(entry, &dev->dev, MSI_DESC_ALL) {
-		if (write_msg)
-			__pci_write_msi_msg(entry, &entry->msg);
-		pci_msix_write_vector_ctrl(entry, entry->pci.msix_ctrl);
+	scoped_guard (msi_descs_lock, &dev->dev) {
+		msi_for_each_desc(entry, &dev->dev, MSI_DESC_ALL) {
+			if (write_msg)
+				__pci_write_msi_msg(entry, &entry->msg);
+			pci_msix_write_vector_ctrl(entry, entry->pci.msix_ctrl);
+		}
 	}
-	msi_unlock_descs(&dev->dev);
 
 	pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
 }