4.9-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 6314dab4b8fb8493d810e175cb340376052c69b6 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/usb/cdc_ncm.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c index 3086cae62fdc..7b158674ceed 100644 --- a/drivers/net/usb/cdc_ncm.c +++ b/drivers/net/usb/cdc_ncm.c @@ -772,7 +772,7 @@ 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) @@ -890,7 +890,7 @@ 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