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

[Thomas Gleixner]

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 <t...@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;