serial: exar: Enable MSI support

Use pci_alloc_irq_vectors to enable MSI when available. At least the
XR17V352 supports this.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/tty/serial/8250/8250_exar.c b/drivers/tty/serial/8250/8250_exar.c
index f612da326e82..b89c4ffc0486 100644
--- a/drivers/tty/serial/8250/8250_exar.c
+++ b/drivers/tty/serial/8250/8250_exar.c
@@ -283,10 +283,16 @@ exar_pci_probe(struct pci_dev *pcidev, const struct pci_device_id *ent)
 
         priv->board = board;
 
+        pci_set_master(pcidev);
+
+        rc = pci_alloc_irq_vectors(pcidev, 1, 1, PCI_IRQ_ALL_TYPES);
+        if (rc < 0)
+                return rc;
+
         memset(&uart, 0, sizeof(uart));
         uart.port.flags = UPF_SKIP_TEST | UPF_BOOT_AUTOCONF | UPF_SHARE_IRQ
                           | UPF_EXAR_EFR;
-        uart.port.irq = pcidev->irq;
+        uart.port.irq = pci_irq_vector(pcidev, 0);
         uart.port.dev = &pcidev->dev;
 
         for (i = 0; i < nr_ports && i < maxnr; i++) {