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net: cdc_ncm: only the control intf can be probed 

The probed interface must be the master/control interface of the
function.  Make this explicit and simplify redundant tests.

Cc: Alexey Orishko <alexey.orishko@gmail.com>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bjørn Mork 2013-11-01 11:16:48 +01:00 committed by David S. Miller
parent 832922362e
commit 9fe0234c0b
1 changed files with 8 additions and 6 deletions
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14
drivers/net/usb/cdc_ncm.c
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@ -394,6 +394,9 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
/* store ctx pointer in device data field */
dev->data[0] = (unsigned long)ctx;
/* only the control interface can be successfully probed */
ctx->control = intf;
/* get some pointers */
driver = driver_of(intf);
buf = intf->cur_altsetting->extra;
@ -411,9 +414,10 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
break;
union_desc = (const struct usb_cdc_union_desc *)buf;
ctx->control = usb_ifnum_to_if(dev->udev,
union_desc->bMasterInterface0);
/* the master must be the interface we are probing */
if (intf->cur_altsetting->desc.bInterfaceNumber !=
union_desc->bMasterInterface0)
goto error;
ctx->data = usb_ifnum_to_if(dev->udev,
union_desc->bSlaveInterface0);
break;
@ -459,14 +463,12 @@ advance:
/* some buggy devices have an IAD but no CDC Union */
if (!union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
ctx->control = intf;
ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
}
/* check if we got everything */
if ((ctx->control == NULL) || (ctx->data == NULL) ||
((!ctx->mbim_desc) && ((ctx->ether_desc == NULL) || (ctx->control != intf))))
if (!ctx->data || (!ctx->mbim_desc && !ctx->ether_desc))
goto error;
/* claim data interface, if different from control */