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SubjectRe: [BUG] bisected: PandaBoard smsc95xx ethernet driver error from USB timeout
On Wed, 20 Mar 2013, Frank Rowand wrote:

> 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 <stern@rowland.harvard.edu>
> 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.

> Note that to compile this version of the kernel, an additional fix must
> also be applied:
>
> commit ba5952e0711b14d8d4fe172671f8aa6091ace3ee
> Author: Ming Lei <ming.lei@canonical.com>
> Date: Fri Jul 13 17:25:24 2012 +0800
>
> USB: ehci-omap: fix compile failure(v1)
>
> The symptom can be worked around by retrying the USB access if a timeout
> occurs. This is clearly _not_ the fix, just a hack that I used to
> investigate the problem:
>
> http://article.gmane.org/gmane.linux.rt.user/9773
>
> My kernel configuration is:
>
> arch/arm/configs/omap2plus_defconfig
>
> plus to get the ethernet driver I add:
>
> CONFIG_USB_EHCI_HCD
> CONFIG_USB_NET_SMSC95XX
>
> I found the problem on 3.6.11, but have not replicated it on 3.9-rcX
> yet because my config fails to build on 3.9-rc1 and 3.9-rc2. I'll try
> to work on that issue tomorrow.

Let me know how it works out.

Alan Stern



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