linux-kernel - Re: [USB spamming log] with 3.16-rc (git) my pl2303 is spaming my logs

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Date:	Sat, 5 Jul 2014 11:02:06 -0700
From:	Greg KH <greg@...ah.com>
To:	Ed Tomlinson <edt@....ca>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [USB spamming log] with 3.16-rc (git) my pl2303 is spaming my
 logs

On Sat, Jul 05, 2014 at 10:55:57AM -0400, Ed Tomlinson wrote:
> Hi
> 
> I have a raspberry PI sending its console to my box via a pl2303 

What exact pl2303 is this?  Can you provide the output from 'lsusb'?

> [    5.184385] usbserial: USB Serial support registered for pl2303
> [    5.184398] pl2303 1-2.6:1.0: pl2303 converter detected
> [    5.185353] usb 1-2.6: pl2303 converter now attached to ttyUSB0
> 
> and with the latest fixes from git on 3.16 its now started spamming my logs with: 
> 
> [55507.155354] pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - nonzero urb status: -71
> [55510.736558] pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - nonzero urb status: -71
> [55517.238586] pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - nonzero urb status: -71
> [55521.099938] pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - nonzero urb status: -71
> [55521.778520] pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - nonzero urb status: -71
> [55523.229808] pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - nonzero urb status: -71
> [55523.229846] pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - nonzero urb status: -71
> [55525.074519] pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - nonzero urb status: -71
> [55527.270207] pl2303 ttyUSB0: usb_serial_generic_read_bulk_callback - nonzero urb status: -71

That's saying there was one of the following errors in this device:
  a) bitstuff error
  b) no response packet received within the prescribed bus turn-around
     time
  c) unknown USB error

All of which point to either a problem in the USB host controller, or
the usb device itself.

Is this an "unpatched" 3.16-rc kernel running on the rpi?  If so, odds
are it's a host controller issue...

thanks,

greg k-h
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