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[Qemu-devel] [patch][usb] another hub fix

From: Lonnie Mendez
Subject: [Qemu-devel] [patch][usb] another hub fix
Date: Sat, 25 Mar 2006 21:40:37 -0600
User-agent: Mozilla Thunderbird 1.0.7 (X11/20050923)

Hello list. The bsd uhub driver has helped to uncover a bug in the hub layer:

usb_20 (
usb11   (

This bit is set when the PORT_ENABLE bit changes from one to zero as a result of a Port Error condition ... This bit is not set on any other changes to PORT_ENABLE.

During a port reset condition the C_PORT_ENABLE bit is being set. The spec however indicates this should only be set in an error condition. The linked patch fixes this and resolves the "illegal enable change" message from the uhub driver on bsd guests.


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