[speedtouch] Re: USB read timeout with PIIX3 USB

[Tim Woodall]

On Wed, 1 May 2002, Vladimir Vyskocil wrote:

> 
> Hi,
> 
> I'm investigating the lock out I have on my board with a USB Controller: Intel Corp. 
>82371SB PIIX3 USB [Natoma/Triton II] (rev 1). 
> I have found that pppoa2 (I don't tried with pppoa3 for now) from 
>speedtouch-CVS_03_03_2002 package block from time to time a this line in pppoa2.c :
> 
> n = pusb_endpoint_read(epdata, lbuf, sizeof(lbuf),  0);
> 
> When the lock append, I must wait that my cron script 'checkadsl' ping remote ppp 
>adresse and then restart pppd. pppoa2 get stucked at this line waiting for data that 
>never come (i don't know why ?) until the script kill pppd.
> 
> I changed this line to 
> 
> n = pusb_endpoint_read(epdata, lbuf, sizeof(lbuf),  30000);
> 
> And now I don't have lockout anymore ! But when there is no data transfert for 30s I 
>get these lines in /var/log/syslog : 
> 
> May  1 22:48:54 hector kernel: usb_control/bulk_msg: timeout
> May  1 22:48:54 hector kernel: usbdevfs: USBDEVFS_BULK failed dev 3 ep 0x87 len 3392 
>ret -110
> 
> It seems that something better should be done in the driver, as I saw that I'm not 
>alone with this problem.
> 
We think it is a buggy chipset problem. pppoa3 works better for me - and I 
have posted a patch that halves the download rate but seems to be stable.

(When I tried this, the usb stall stopped for 30 seconds until the timeout
restarted. You will get better response if you reduce the 30000 to about 
500 - but I suggest that you patch the kernel to stop the logs filling up -
alternatively don't log kern.debug (I think).

I think that this is going to need a kernel fix rather than a driver fix
(although I suspect that it is going to be a CONFIG_TRITON_FIX compile
option)

Tim

-- 
God said, "div D = rho, div B = 0, curl E = - @B/@t, curl H = J + @D/@t," 
and there was light.

     http://tjw.hn.org/      http://www.locofungus.btinternet.co.uk/



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