Subject: [patch 22/22] PCI/MSI: Move descriptor counting on allocation fail to the legacy code

From: Thomas Gleixner <[email-masked]>
Date: Sat, 27 Nov 2021 02:19:09 +0100 (CET)

The irqdomain code already returns the information. Move the loop to the
legacy code.

Signed-off-by: Thomas Gleixner <[email-masked]>
---
 drivers/pci/msi/legacy.c |   20 +++++++++++++++++++-
 drivers/pci/msi/msi.c    |   19 +------------------
 2 files changed, 20 insertions(+), 19 deletions(-)

--- a/drivers/pci/msi/legacy.c
+++ b/drivers/pci/msi/legacy.c
@@ -50,9 +50,27 @@ void __weak arch_teardown_msi_irqs(struc
 	}
 }
 
+static int pci_msi_setup_check_result(struct pci_dev *dev, int type, int ret)
+{
+	struct msi_desc *entry;
+	int avail = 0;
+
+	if (type != PCI_CAP_ID_MSIX || ret >= 0)
+		return ret;
+
+	/* Scan the MSI descriptors for successfully allocated ones. */
+	for_each_pci_msi_entry(entry, dev) {
+		if (entry->irq != 0)
+			avail++;
+	}
+	return avail ? avail : ret;
+}
+
 int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
-	return arch_setup_msi_irqs(dev, nvec, type);
+	int ret = arch_setup_msi_irqs(dev, nvec, type);
+
+	return pci_msi_setup_check_result(dev, type, ret);
 }
 
 void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev)
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -609,7 +609,7 @@ static int msix_capability_init(struct p
 
 	ret = pci_msi_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
 	if (ret)
-		goto out_avail;
+		goto out_free;
 
 	/* Check if all MSI entries honor device restrictions */
 	ret = msi_verify_entries(dev);
@@ -634,23 +634,6 @@ static int msix_capability_init(struct p
 	pcibios_free_irq(dev);
 	return 0;
 
-out_avail:
-	if (ret < 0) {
-		/*
-		 * If we had some success, report the number of IRQs
-		 * we succeeded in setting up.
-		 */
-		struct msi_desc *entry;
-		int avail = 0;
-
-		for_each_pci_msi_entry(entry, dev) {
-			if (entry->irq != 0)
-				avail++;
-		}
-		if (avail != 0)
-			ret = avail;
-	}
-
 out_free:
 	free_msi_irqs(dev);

---

From: Thomas Gleixner <[email-masked]>
Date: Sat, 27 Nov 2021 02:19:55 +0100 (CET)

-out_avail:
-	if (ret < 0) {
-		/*