Commit 7fae7bfb authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
Browse files

cdc-wdm: use the common CDC parser 



Now that the common parser resides in USB core, it can
be used for CDC-WDM.

Signed-off-by: default avatarOliver Neukum <ONeukum@suse.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6dd3587f

drivers/usb/class/cdc-wdm.c

+5 −25
Original line number Diff line number Diff line
@@ -875,38 +875,18 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) 
	int rv = -EINVAL;

	struct usb_host_interface *iface;

	struct usb_endpoint_descriptor *ep;

	struct usb_cdc_dmm_desc *dmhd;

	struct usb_cdc_parsed_header hdr;

	u8 *buffer = intf->altsetting->extra;

	int buflen = intf->altsetting->extralen;

	u16 maxcom = WDM_DEFAULT_BUFSIZE;



	if (!buffer)

		goto err;

	while (buflen > 2) {

		if (buffer[1] != USB_DT_CS_INTERFACE) {

			dev_err(&intf->dev, "skipping garbage\n");

			goto next_desc;

		}



		switch (buffer[2]) {

		case USB_CDC_HEADER_TYPE:

			break;

		case USB_CDC_DMM_TYPE:

			dmhd = (struct usb_cdc_dmm_desc *)buffer;

			maxcom = le16_to_cpu(dmhd->wMaxCommand);

			dev_dbg(&intf->dev,

				"Finding maximum buffer length: %d", maxcom);

			break;

		default:

			dev_err(&intf->dev,

				"Ignoring extra header, type %d, length %d\n",

				buffer[2], buffer[0]);

			break;

		}

next_desc:

		buflen -= buffer[0];

		buffer += buffer[0];

	}

	cdc_parse_cdc_header(&hdr, intf, buffer, buflen);



	if (hdr.usb_cdc_dmm_desc)

		maxcom = le16_to_cpu(hdr.usb_cdc_dmm_desc->wMaxCommand);



	iface = intf->cur_altsetting;

	if (iface->desc.bNumEndpoints != 1)