On Monday 22 March 2010 16:06:34 Larry Finger wrote: > Avoiding the use of a new user-space program would be desirable, but I cannot > think of any way that a udev rule could distinguish one card from another. If we > had any unique features such as a serial number, then we wouldn't need user > space at all. Any suggestions? I don't see a problem for udev to distinguish the cards. It can do it merely on the bus-ID. That's unique. Yeah, it might change if you change the hardware. But do we care? I say no, because you cannot actually change the hardware in real life for any of these devices. And even if you could reorder the devices on the bus or whatever. What would happen? The card would get a new MAC address. That's all. That's acceptable. The kernel would (for example) just set the mac address to all-ones. Udev would notice this (invalid) mac address and reassign a new persistent one to the device. It then stores the address on the harddisk. In fact, if we implement a mechanism in the kernel, we have _exactly_ the same problem. However, currently Larry's patches just ignore that problem and assume that there's only one card in the system anyway. -- Greetings, Michael. -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
