net: cdc_ncm: GetNtbFormat endian fix

The GetNtbFormat and SetNtbFormat requests operate on 16 bit little
endian values. We get away with ignoring this most of the time, because
we only care about USB_CDC_NCM_NTB16_FORMAT which is 0x0000.  This
fails for USB_CDC_NCM_NTB32_FORMAT.

Fix comparison between LE value from device and constant by converting
the constant to LE.

Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Fixes: 2b02c20ce0c2 ("cdc_ncm: Set NTB format again after altsetting switch for Huawei devices")
Cc: Enrico Mioso <mrkiko.rs@gmail.com>
Cc: Christian Panton <christian@panton.org>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Acked-By: Enrico Mioso <mrkiko.rs@gmail.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 47cab1bde0659a518cea55e1ae54d9dccccdaa25..9e1b74590682e1b44242374f34fd628bdd5b1fbb 100644 (file)
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -771,7 +771,7 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
        int err;
        u8 iface_no;
        struct usb_cdc_parsed_header hdr;
-       u16 curr_ntb_format;
+       __le16 curr_ntb_format;
 
        ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
        if (!ctx)
@@ -889,7 +889,7 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
                        goto error2;
                }
 
-               if (curr_ntb_format == USB_CDC_NCM_NTB32_FORMAT) {
+               if (curr_ntb_format == cpu_to_le16(USB_CDC_NCM_NTB32_FORMAT)) {
                        dev_info(&intf->dev, "resetting NTB format to 16-bit");
                        err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
                                               USB_TYPE_CLASS | USB_DIR_OUT