Re: [BUG] pl2303 oops in 2.4.20-pre10 (and 2.5 too)

From: Barry K. Nathan (
Date: Sat Oct 12 2002 - 20:26:06 EST

(I didn't see this e-mail when I sent my [PATCH] that seems to work.)

On Sat, Oct 12, 2002 at 05:49:39PM -0700, Greg KH wrote:
> On Sat, Oct 12, 2002 at 01:56:04PM -0700, Barry K. Nathan wrote:
> Ah, thanks for finding this. Yes this does help, a bit. Hm. What /dev
> device are you trying to write to, ttyUSB0 or ttyUSB1? Yeah, I think we
> need this kind of check back in to fix this problem, but I don't see off
> the top of my head how to add it back...


> And yes, the problem in 2.5 where you see the device register itself
> twice is a known bug (to me at least), it goes away if you disable
> CONFIG_USB_SERIAL_GENERIC. It's on my TODO list, which seems to be
> getting longer every day...

No, it doesn't go away in 2.5 if I disable CONFIG_USB_SERIAL_GENERIC (I
just checked).

> Any suggestions on how to fix this are appreciated. Basically we don't
> want to claim the interface that only has the interrupt endpoint on it
> for this device, as we kinda already did in the section entitled END
> HORRIBLE HACK FOR PL2303. I guess we could just mark that interface as
> claimed already, and then probe() would not get called again. Want to
> throw a call to usb_driver_claim_interface() into that section, grabbing
> that interface, and see if that works?

If I have time today I'll try that.

-Barry K. Nathan <>
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