linux-kernel - Subject: [v3.8 Regression] UHCI: OHCI: implement new semantics for URB_ISO

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Message-ID: <51C87554.8010503@canonical.com>
Date:	Mon, 24 Jun 2013 12:35:32 -0400
From:	Joseph Salisbury <joseph.salisbury@...onical.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Greg KH <gregkh@...uxfoundation.org>,
	USB list <linux-usb@...r.kernel.org>,
	linux-kernel@...r.kernel.org
Subject: Subject:  [v3.8 Regression]  UHCI: OHCI: implement new semantics
 for URB_ISO_ASAP

Hi Alan,

A bug was opened against the Ubuntu distro[0].  It is believed that the
following commits introduced the regression:

commit c44b225077bb1fb25ed5cd5c4f226897b91bedd4
Author: Alan Stern <stern@...land.harvard.edu>
Date:   Mon Oct 1 10:32:09 2012 -0400

    UHCI: implement new semantics for URB_ISO_ASAP

commit 6a41b4d3fe8cd4cc95181516fc6fba7b1747a27c
Author: Alan Stern <stern@...land.harvard.edu>
Date:   Mon Oct 1 10:32:15 2012 -0400

    OHCI: implement new semantics for URB_ISO_ASAP

The regression was introduced as of v3.8-rc1. 

I see the following commit was created to address a similar issue to this:

commit e1944017839d7dfbf7329fac4bdec8b4050edf5e
Author: Alan Stern <stern@...land.harvard.edu>
Date:   Tue May 14 13:57:19 2013 -0400

    USB: fix latency in uhci-hcd and ohci-hcd

I created a test kernel with commit
e1944017839d7dfbf7329fac4bdec8b4050edf5e.  However, folks affected state
this bug still exists with commit e194401.  It is also reported that
this bug exists in the latest Mainline kernel.

I see that you are the author of these patches, so I wanted to get your
opinion on the issue.

Thanks,

Joe

[0] http://pad.lv/1191603

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