Re: [Ftdi-usb-sio-devel] Interleaved write/read operations on ftdi_sio seem to cause an error

[Bill R. <bil...@gm...>]

This bit is suspicious:

[72206.721645] /tmp/linux-2.6.27.9/drivers/usb/serial/ftdi_sio.c: (this
is ok on close) nonzero read bulk status received: -75
[72206.721652] /tmp/linux-2.6.27.9/drivers/usb/serial/ftdi_sio.c:
ftdi_write_bulk_callback - port 0
[72206.856067] hub 4-0:1.0: port 2 disabled by hub (EMI?), re-enabling...
[72206.856076] usb 4-2: USB disconnect, address 43

The write bulk callback gives an error then the usb stack says the hub has
disabled the port - which is probably the cause of the error.

You could try it without the hub in the way or maybe off another usb port.