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

Thomas Gleixner
2022-11-11T13:57:54Z

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 <tglx@linutronix.de>
---
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;