Messages in this thread | | | Date | Mon, 22 Feb 2010 10:28:36 -0500 (EST) | From | Alan Stern <> | Subject | Re: [REGRESSION] "USB: use kfifo to buffer usb-generic serial writes" causes gobi_loader to hang |
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On Mon, 22 Feb 2010, Anssi Hannula wrote:
> > > If I additionally insert a one-second delay before the fd is closed, I > > > get this usbmon log: > > > http://stuff.onse.fi/gobi2000/gobi-regression5.mon.log > > > > > > The firmware upload is still unsuccessful. > > > > If I use the option driver instead of qcserial, the firmware upload is > > always successful (without any added delays needed). The usbmon log for > > that case can be found here: > > http://stuff.onse.fi/gobi2000/gobi-regression6.mon.log > > I installed 2.6.31.12 to get a usbmon log with qcserial before the regression > as well (without delays, upload successful): > http://stuff.onse.fi/gobi2000/gobi-regression7.mon.log
The major difference between the logs is in the way the data get divided up into packets. In both the successful logs, there are sequences of bulk-OUT packets with lengths like:
44, 1, 15, 1, 13
where the unsuccessful transfer just has a single packet of length 74. Also, the successful transfers show a lot of bulk-IN traffic where the unsuccessful transfer doesn't have any. I don't know if that is relevant, however.
No other differences stand out.
Alan Stern
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