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-rw-r--r--drivers/tty/serial/8250/8250_mid.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c
index e8122375aa18..86379a79a6a3 100644
--- a/drivers/tty/serial/8250/8250_mid.c
+++ b/drivers/tty/serial/8250/8250_mid.c
@@ -80,7 +80,11 @@ static int tng_setup(struct mid8250 *mid, struct uart_port *p)
struct pci_dev *pdev = to_pci_dev(p->dev);
int index = PCI_FUNC(pdev->devfn);
- /* Currently no support for HSU port0 */
+ /*
+ * Device 0000:00:04.0 is not a real HSU port. It provides a global
+ * register set for all HSU ports, although it has the same PCI ID.
+ * Skip it here.
+ */
if (index-- == 0)
return -ENODEV;