Re: [BUG] bisected: PandaBoard smsc95xx ethernet driver error from USB timeout

On 03/21/13 07:41, Alan Stern wrote:

On Wed, 20 Mar 2013, Frank Rowand wrote:

quoted

Hi All,

Not quite sure quite where the problem is (USB, OMAP, smsc95xx driver, other???),
so casting the nets wide...

The PandaBoard frequently fails to boot with an eth0 error when mounting
the root file system via NFS (ethernet driver fails due to a USB timeout;
no ethernet means NFS won't work).  A typical set of error messages is:

[    3.264373] smsc95xx 1-1.1:1.0: usb_probe_interface
[    3.269500] smsc95xx 1-1.1:1.0: usb_probe_interface - got id
[    3.275543] smsc95xx v1.0.4
[    8.078674] smsc95xx 1-1.1:1.0: eth0: register 'smsc95xx' at usb-ehci-omap.0-1.1, smsc95xx USB 2.0 Ethernet, 82:b9:1d:fa:67:0d
[    8.091003] hub 1-1:1.0: state 7 ports 5 chg 0000 evt 0002
[   13.509918] usb 1-1.1: swapper/0 timed out on ep0out len=0/4
[   13.515869] smsc95xx 1-1.1:1.0: eth0: Failed to write register index 0x00000108
[   13.523559] smsc95xx 1-1.1:1.0: eth0: Failed to write ADDRL: -110
[   13.529998] IP-Config: Failed to open eth0

I have bisected this to:

  commit 18aafe64d75d0e27dae206cacf4171e4e485d285
  Author: Alan Stern [off-list ref]
  Date:   Wed Jul 11 11:23:04 2012 -0400

     USB: EHCI: use hrtimer for the I/O watchdog

I don't understand how that commit could cause a timeout unless there 
are at least two other bugs present in your system.

Yes, I would not be at all surprised if this commit merely exposes a
problem in other code.  That is why I included so many different people
and subsystems on the email distribution list.

< snip >

-Frank

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