Re: [RFC]Is usb port number fixed?

From: Alan Stern
Date: Sun Apr 22 2012 - 08:47:23 EST

On Sun, 22 Apr 2012, Anil Nair wrote:

> The port number comes from root hub managed by the host controller. Its
> fixed dynamically during enumeration, and can change.
> Please correct me if i am wrong.

You are indeed wrong. Port numbers are not fixed dynamically and they
cannot change.

On the other hand, bus numbers _are_ assigned dynamically and they can
(and do) change.

Alan Stern

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at