linux-kernel - Re: Use of start_frame in usbusx2yaudio.c

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Message-ID: <Pine.LNX.4.44L0.1005121051040.1962-100000@iolanthe.rowland.org>
Date:	Wed, 12 May 2010 10:54:23 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
cc:	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	Clemens Ladisch <clemens@...isch.de>,
	Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Joe Perches <joe@...ches.com>,
	USB list <linux-usb@...r.kernel.org>,
	<alsa-devel@...a-project.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Use of start_frame in usbusx2yaudio.c

On Tue, 11 May 2010, Sarah Sharp wrote:

> Are there any drivers in the kernel that set urb->start_frame on every
> URB?
> 
> Could those drivers handle it if only the first URB they submitted to
> the host controller was scheduled for that frame ID, and all the rest of
> the URBs were scheduled ASAP?

BTW, urb->start_frame generally is ignored as an input parameter.  Many 
host controller drivers pay no attention to it.  Unless someone has a 
real reason, I think we are better off not using it.

Alan Stern

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