[PULL v3 24/55] pcie_aer: Don't trigger a LSI if none are defined

["Michael S. Tsirkin" <mst@redhat.com>]

From: Frederic Barrat <fbarrat@linux.ibm.com>

Skip triggering an LSI when the AER root error status is updated if no
LSI is defined for the device. We can have a root bridge with no LSI,
MSI and MSI-X defined, for example on POWER systems.

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Message-Id: <20211116170133.724751-4-fbarrat@linux.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
---
 hw/pci/pcie_aer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/pci/pcie_aer.c b/hw/pci/pcie_aer.c
index 27f9cc56af..e1a8a88c8c 100644
--- a/hw/pci/pcie_aer.c
+++ b/hw/pci/pcie_aer.c
@@ -774,7 +774,9 @@ void pcie_aer_root_write_config(PCIDevice *dev,
     uint32_t root_cmd = pci_get_long(aer_cap + PCI_ERR_ROOT_COMMAND);
     /* 6.2.4.1.2 Interrupt Generation */
     if (!msix_enabled(dev) && !msi_enabled(dev)) {
-        pci_set_irq(dev, !!(root_cmd & enabled_cmd));
+        if (pci_intx(dev) != -1) {
+            pci_set_irq(dev, !!(root_cmd & enabled_cmd));
+        }
         return;
     }
 
-- 
MST