Re: Option Icon 322 or ATT Quicksilver 3G modem

[Dan Williams <dcbw redhat com>]

On Tue, 2010-05-04 at 22:15 -0500, Eric Lee Elliott wrote:
> Each of my 3 computers lock when Option Icon 322 is plugged.  Latest 
> version of Kubuntu does same.  Open log viewers show last 10 new lines 
> of log are not recorded to disk due to system failure.  Power switch is 
> only way to restore computer operation after modem is plugged.  Latest 
> 10.04 kubuntu also needs power off after modem is plugged.
> 
> People seem to have isolated cause of problem here in Nov 09 but I find 
> no record of problem being fixed. 
> http://www.pharscape.org/forum/index.php/topic,802.0.html
> 
> I think I know enough to see they have determined problem is HSO driver 
> not cooperating with modem manager.  What should I do next?

Fix the hso driver really.  It's had a pretty rocky history

There are clearly TTY layer locking issues with hso; in fact unplugging
the hso device while the port is open on 2.6.33 causes a kernel bug that
kills that USB port until reboot (unbalanced refcounting).  Basically,
there isn't *ever* a case where the kernel driver should crash because
of userspace.

I just tested unplug-while-ports-open on 4 different Option devices
(i452, i225, Quicksilver/GIO322, and GT MAX 3.6) and got these separate
driver bugs:

https://bugzilla.kernel.org/show_bug.cgi?id=15915
https://bugzilla.kernel.org/show_bug.cgi?id=15916
https://bugzilla.kernel.org/show_bug.cgi?id=15917

Unfortunately, this means debugging the hso driver to figure out why
these things happen.  But in the end, they do need to be fixed as they
are regressions from 2.6.32.

Dan