[Ftdi-usb-sio-devel] Strange behavior of ftdi module when communicating with device.

[Toan P. <tph...@gm...>]

Hi everyone,

I am not sure if this is the right place to post this message but I've been
experiencing an odd bug in the ftdi_sio kernel module.
After an usb device (using a FTDI 232RQ chip) is connected, it will then
periodically get disconnected and rediscovered after after
sometime when my application communicating with it.  Also, I found one can
easily replicate this problem by doing the following.

a.  Using Linux kernel 2.6.21.7, plug in a usb device having a FTDI 232RQ
chipset
b.  stty -F /dev/ttyUSB0 19200 # Set the proper speed to the device
c.  cat /etc/* > /dev/ttyUSB0
d.  dmesg # you'll see the module error messages and that it got closed and
re-open (rediscovered)

Again, this problem only occurred on my T2 SDE Linux using Kernel 2.6.21-7.
I tested this on my Ubuntu 7.1 box and it ran fine.

I am not sure if this is a kernel or kernel module bug fix that I am not
aware about.  Would someone comment on this strange behavior of the FTDI
USB-serial kernel module ?  thank you.

Toan