linux-kernel - Re: Allocating buffers for USB transfers (again)

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Date:	Fri, 12 Aug 2011 01:50:01 +0200
From:	Matěj Laitl <matej@...tl.cz>
To:	Daniel Mack <zonque@...il.com>
Cc:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Florian Mickler <florian@...kler.org>,
	Oliver Neukum <oliver@...kum.org>, linux-usb@...r.kernel.org,
	alsa-devel@...a-project.org, Takashi Iwai <tiwai@...e.de>,
	Clemens Ladisch <clemens@...isch.de>, pedrib@...il.com,
	William Light <wrl@...est.net>, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org, Robert Hancock <hancockrwd@...il.com>
Subject: Re: Allocating buffers for USB transfers (again)

On 12. 8. 2011 Daniel Mack wrote:
> > This patch actually makes the sound playback _worse_. Now I get strange
> > squawks where previously at least first seconds of a song sounded
> > normally.
> > 
> > However, I no longer get "zero length buffer submitted" or that "...
> > Weird." debug messages, only several megabytes of: (should I post these
> > somewhere?)
> > 
> > xhci_hcd 0000:05:00.0: Giveback URB ffff880114cec000, len = 880,
> > expected = 1000, status = -115
> > xhci_hcd 0000:05:00.0: Giveback URB ffff880114740000, len = 352,
> > expected = 1000, status = -115
> > xhci_hcd 0000:05:00.0: underrun event on endpoint
> 
> Might be the hardware doesn't like this. As I said, the patch is blindly 
> written and I couldn't test it. Did you test this on a EHCI port as well?

Good point, this patch distorts the playback also on the EHCI port. (the 
playback seems to be 10 times slower than it should be)

Now I have to go, but I hope I'll get another patch from you tomorrow. :-)

Thanks,
               Matej

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