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net: cdc_ncm: GetNtbFormat endian fix

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[ Upstream commit 6314dab4b8 ]

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: 2b02c20ce0 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bjørn Mork 2017-11-15 09:35:02 +01:00 committed by Greg Kroah-Hartman
parent 829af2cd8a
commit 060dd7a476
1 changed files with 2 additions and 2 deletions
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4
drivers/net/usb/cdc_ncm.c
View file

@ -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