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-rw-r--r--sys/dev/uart/uart_bus_pci.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/sys/dev/uart/uart_bus_pci.c b/sys/dev/uart/uart_bus_pci.c
index 0ed3d7f4f974..fbd1d68b88ca 100644
--- a/sys/dev/uart/uart_bus_pci.c
+++ b/sys/dev/uart/uart_bus_pci.c
@@ -227,10 +227,10 @@ uart_pci_attach(device_t dev)
sc = device_get_softc(dev);
/*
- * Use MSI in preference to legacy IRQ if available.
- * Whilst some PCIe UARTs support >1 MSI vector, use only the first.
+ * Use MSI in preference to legacy IRQ if available. However, experience
+ * suggests this is only reliable when one MSI vector is advertised.
*/
- if (pci_msi_count(dev) > 0) {
+ if (pci_msi_count(dev) == 1) {
count = 1;
if (pci_alloc_msi(dev, &count) == 0) {
sc->sc_irid = 1;