Subject: [patch 35/39] PCI/MSI: Reject MSI-X early

From: Thomas Gleixner <[email-masked]>
Date: Fri, 11 Nov 2022 14:55:11 +0100 (CET)

Similar to PCI multi-MSI reject MSI-X enablement when a irq domain is
attached to the device which does not support MSI-X.

Signed-off-by: Thomas Gleixner <[email-masked]>
---
 drivers/pci/msi/msi.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -760,6 +760,10 @@ int __pci_enable_msix_range(struct pci_d
 	if (WARN_ON_ONCE(dev->msix_enabled))
 		return -EINVAL;
 
+	/* Check MSI-X early on irq domain enabled architectures */
+	if (!pci_msi_domain_supports(dev, MSI_FLAG_PCI_MSIX, ALLOW_LEGACY))
+		return -ENOTSUPP;
+
 	if (!pci_msi_supported(dev, nvec) || dev->current_state != PCI_D0)
 		return -EINVAL;