diff options
| -rw-r--r-- | sys/dev/uart/uart_bus_pci.c | 6 |
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; |