1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/serial/ioc4_serial.c b/drivers/serial/ioc4_serial.c
index c620209d7b9a..717e47bbd784 100644
--- a/drivers/serial/ioc4_serial.c
+++ b/drivers/serial/ioc4_serial.c
@@ -2646,7 +2646,10 @@ static int ioc4_serial_remove_one(struct ioc4_driver_data *idd)
         struct ioc4_port *port;
         struct ioc4_soft *soft;
 
+        /* If serial driver did not attach, don't try to detach */
         control = idd->idd_serial_data;
+        if (!control)
+                return 0;
 
         for (port_num = 0; port_num < IOC4_NUM_SERIAL_PORTS; port_num++) {
                 for (port_type = UART_PORT_MIN;
@@ -2778,6 +2781,12 @@ ioc4_serial_attach_one(struct ioc4_driver_data *idd)
         DPRINT_CONFIG(("%s (0x%p, 0x%p)\n", __FUNCTION__, idd->idd_pdev,
                                                         idd->idd_pci_id));
 
+        /* PCI-RT does not bring out serial connections.
+         * Do not attach to this particular IOC4.
+         */
+        if (idd->idd_variant == IOC4_VARIANT_PCI_RT)
+                return 0;
+
         /* request serial registers */
         tmp_addr1 = idd->idd_bar0 + IOC4_SERIAL_OFFSET;