Re: USB disconnects in 2.6.20-rc5 (but improved behaviour over earlier RCs)

Antti P Miettinen <[email protected]> writes:
> So the token field indicates transaction error in qtd_copy_status(),
> right? How could I diagnose further?

I added some ehci_dbg() and dump_stack() calls here and there and been
reading the USB 2.0 spec. It seems that for some reason the USB device
inside the PCI card sometimes gives transaction errors:

[17179738.432000] ehci_hcd 0000:03:0c.2: XactErr, ep3in, token=0000cd08
[17179783.756000] ehci_hcd 0000:03:0c.2: XactErr, ep0out, token=00000c08
[17179784.868000] ehci_hcd 0000:03:0c.2: XactErr, ep2in, token=80004d08
[17179831.060000] ehci_hcd 0000:03:0c.2: XactErr, ep2in, token=80004d08

etc.. and finally hard failure:

[17181900.808000] ehci_hcd 0000:03:0c.2: XactErr, ep3in, token=0038c948
[17181900.808000] ehci_hcd 0000:03:0c.2: XactErr, ep0out, token=80008148
[17181900.808000] ehci_hcd 0000:03:0c.2: devpath 1 ep0out 3strikes,t=80008148

In the usbmon log as far as I've understood we first get one EPIPE
which corresponds to the token having transfer length 0x38 above and
then start getting EPROTO:

f76228c0 30344747 C Bi:002:02 -32 39424 = 36629c1a dc40077f eefbb3df d85cf2d0 09661035 40829685 d6fa47bf d1ff4134
f76228c0 30344747 S Bi:002:02 -115 39480 <
f7723bc0 30344747 C Bi:002:03 -71 10240 = 780c27df afdfe043 b14a917c eab7edf8 b8007f36 58551dad f866c527 6c1e391b
f7723bc0 30344747 S Bi:002:03 -115 39480 <
f7622840 30344748 C Bi:002:02 -71 0
f7622840 30344748 S Bi:002:02 -115 39480 <
f7723b40 30344748 C Bi:002:03 -71 0

Does anyone have tools/scripts for decoding the usbmon logs?

-- 
http://www.iki.fi/~ananaza/


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