Hi,
Here's a patch against 2.5.3-pre1 for the USB core that fixes
usb_set_interface() from doing anything when a device only has one
interface. This follows the USB spec. The patch was written by Sancho
Dauskardt.
thanks,
greg k-h
diff -Nru a/drivers/usb/usb.c b/drivers/usb/usb.c
--- a/drivers/usb/usb.c Wed Jan 16 09:57:46 2002
+++ b/drivers/usb/usb.c Wed Jan 16 09:57:46 2002
@@ -2252,6 +2252,14 @@
return -EINVAL;
}
+ /* 9.4.10 says devices don't need this, if the interface
+ only has one alternate setting */
+ if (iface->num_altsetting == 1) {
+ warn("ignoring set_interface for dev %d, iface %d, alt %d",
+ dev->devnum, interface, alternate);
+ return 0;
+ }
+
if ((ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_INTERFACE, USB_RECIP_INTERFACE, alternate,
interface, NULL, 0, HZ * 5)) < 0)
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