On Wed, 24 Feb 2010, Sarah Sharp wrote: > The only way you would get a null pointer deference when > usb_altnum_to_altsetting() is called in usb_reset_configuration() is if > usb_host_config->interface[i] is null. I think that's only true if the > configuration is not active, meaning the device was in the addressed > state. > > Alan, does this sound correct? It does. However usb_reset_configuration() doesn't get called if actconfig is NULL. > I think the fix is to dig the interfaces out of the interface cache > instead. I'll post a patch in a bit. No, that's not right. The interface cache isn't needed; usb_reset_configuration() should never be called if there isn't an active configuration -- it would make no sense. Instead find out exactly what's going wrong. Write a debugging patch to print actconfig and actconfig->desc.bNumInterfaces in proc_setconfig(), and print intf in usb_reset_configuration(). Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
