1 files changed, 7 insertions, 3 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index d9b408113921..6d57413ac0f5 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -804,7 +804,7 @@ static int acm_probe (struct usb_interface *intf,
 {
         struct usb_cdc_union_desc *union_header = NULL;
         struct usb_cdc_country_functional_desc *cfd = NULL;
-        char *buffer = intf->altsetting->extra;
+        unsigned char *buffer = intf->altsetting->extra;
         int buflen = intf->altsetting->extralen;
         struct usb_interface *control_interface;
         struct usb_interface *data_interface;
@@ -881,9 +881,13 @@ static int acm_probe (struct usb_interface *intf,
                                 if ((call_management_function & 3) != 3)
                                         err("This device cannot do calls on its own. It is no modem.");
                                 break;
-                                
                         default:
-                                err("Ignoring extra header, type %d, length %d", buffer[2], buffer[0]);
+                                /* there are LOTS more CDC descriptors that
+                                 * could legitimately be found here.
+                                 */
+                                dev_dbg(&intf->dev, "Ignoring descriptor: "
+                                                "type %02x, length %d\n",
+                                                buffer[2], buffer[0]);
                                 break;
                         }
 next_desc: