Re: pl2303 ttyUSB0: pl2303_open - failed submitting interrupt urb, error -28

["Luiz Fernando N. Capitulino" <lcapitulino@mandriva.com.br>]

On Tue, 13 Jun 2006 13:46:06 +0200
Frank Gevaerts <frank.gevaerts@fks.be> wrote:

| On Mon, Jun 12, 2006 at 07:21:26PM -0400, Mark Lord wrote:
| > Mark Lord wrote:
| > >Greg KH wrote:
| > >>So we should have finally covered both of them now.
| > >
| > >Yes, agreed.
| > >
| > >So if modify pl2303_open() to have it simulate -ENOMEM from 
| > >usb_submit_urb(),
| > >then this should not crash the entire USB subsystem.  Right?
| > >
| > >Ditto if it happens due to low-memory, rather than me hacking the code 
| > >to test it?
| > 
| > Mmmm.. looks like it's still buggy, but we manage to avoid the bug
| > under *most* circumstances.   Which is good!
| > 
| > But the bug will still need to be fixed.  A failure from usb_submit_urb()
| > should not require a reboot to recover.
| > Here's the results of a simulated -ENOMEM test:
| > 
| > kernel BUG at kernel/workqueue.c:110!
| 
| We had the exact same error here with ipaq.ko. Our problems only went
| away once we applied the following (the first part might already be
| applied).

 Interesting, I couldn't reproduce this with ftdio_sio.

 (and unfortunatally I'm w/o my pl2303 device).

-- 
Luiz Fernando N. Capitulino