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

Luiz Fernando N. Capitulino
2006-06-13T16:27:00Z

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