cdc-ncm: use common parser

This moves cdc-ncm to the common parser for CDC user
to reduce code duplication.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index db40175b1a0b081dfcf5c8eb829d935618324d10..a187f08113ecbb77612dd11a2611d4649d79c47d 100644 (file)
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -698,6 +698,7 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
        int len;
        int temp;
        u8 iface_no;
+       struct usb_cdc_parsed_header hdr;
 
        ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
        if (!ctx)
@@ -722,66 +723,14 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
        len = intf->cur_altsetting->extralen;
 
        /* parse through descriptors associated with control interface */
-       while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) {
-
-               if (buf[1] != USB_DT_CS_INTERFACE)
-                       goto advance;
-
-               switch (buf[2]) {
-               case USB_CDC_UNION_TYPE:
-                       if (buf[0] < sizeof(*union_desc))
-                               break;
-
-                       union_desc = (const struct usb_cdc_union_desc *)buf;
-                       /* the master must be the interface we are probing */
-                       if (intf->cur_altsetting->desc.bInterfaceNumber !=
-                           union_desc->bMasterInterface0) {
-                               dev_dbg(&intf->dev, "bogus CDC Union\n");
-                               goto error;
-                       }
-                       ctx->data = usb_ifnum_to_if(dev->udev,
-                                                   union_desc->bSlaveInterface0);
-                       break;
-
-               case USB_CDC_ETHERNET_TYPE:
-                       if (buf[0] < sizeof(*(ctx->ether_desc)))
-                               break;
-
-                       ctx->ether_desc =
-                                       (const struct usb_cdc_ether_desc *)buf;
-                       break;
-
-               case USB_CDC_NCM_TYPE:
-                       if (buf[0] < sizeof(*(ctx->func_desc)))
-                               break;
-
-                       ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf;
-                       break;
-
-               case USB_CDC_MBIM_TYPE:
-                       if (buf[0] < sizeof(*(ctx->mbim_desc)))
-                               break;
-
-                       ctx->mbim_desc = (const struct usb_cdc_mbim_desc *)buf;
-                       break;
-
-               case USB_CDC_MBIM_EXTENDED_TYPE:
-                       if (buf[0] < sizeof(*(ctx->mbim_extended_desc)))
-                               break;
-
-                       ctx->mbim_extended_desc =
-                               (const struct usb_cdc_mbim_extended_desc *)buf;
-                       break;
-
-               default:
-                       break;
-               }
-advance:
-               /* advance to next descriptor */
-               temp = buf[0];
-               buf += temp;
-               len -= temp;
-       }
+       cdc_parse_cdc_header(&hdr, intf, buf, len);
+
+       ctx->data = usb_ifnum_to_if(dev->udev,
+                                   hdr.usb_cdc_union_desc->bSlaveInterface0);
+       ctx->ether_desc = hdr.usb_cdc_ether_desc;
+       ctx->func_desc = hdr.usb_cdc_ncm_desc;
+       ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
+       ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
 
        /* some buggy devices have an IAD but no CDC Union */
        if (!union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {