Am Montag, 22. Februar 2010 19:35:35 schrieb Anssi Hannula: > On maanantai 22 helmikuu 2010 17:28:36 Alan Stern wrote: > > 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. > > I guess that would suggest that the device doesn't allow the initialization > data to be broken into packets arbitrarily (though some differences seem > allowed, as the windows driver transmits them differently). Hi, let's try testing this hypothesis. Can you change the following line in usb_serial_probe(): if (kfifo_alloc(&port->write_fifo, PAGE_SIZE, GFP_KERNEL)) goto probe_error; to: if (kfifo_alloc(&port->write_fifo, 64, GFP_KERNEL)) goto probe_error; This may shed some light on the behavior. Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
