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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20081203154725.GB15968@kroah.com>
Date:	Wed, 3 Dec 2008 07:47:25 -0800
From:	Greg KH <greg@...ah.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Marc Haber <mh+linux-kernel@...schlus.de>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: pl2303 - pl2303_open - failed submitting interrupt urb, error
	-28

On Wed, Dec 03, 2008 at 01:42:08AM -0800, Andrew Morton wrote:
> (cc linux-usb)
> 
> On Tue, 2 Dec 2008 14:18:21 +0100 Marc Haber <mh+linux-kernel@...schlus.de> wrote:
> 
> > Hi,
> > 
> > the following applies to a "vanilla" 2.6.27.7 kernel built and running
> > on a Debian unstable system.
> > 
> > To obtain out-of-band access to a number of switches and routers, I
> > have a seven-port USB hub to which seven identical USB-to-serial
> > adaptors using the PL2303 chip and driver are connected. All seven
> > work when only one of them is used at a time.
> > 
> > Cereal is an application which keeps a process (GNU screen) attached
> > to the tty at all times to be able to log what happens on the serial
> > port. When I start cereal on all seven ports, I start getting
> > "pl2303_open - failed submitting interrupt urb, error -28" errors in
> > my syslog:
> > 
> > Dec  2 14:07:36 alemana kernel: pl2303 ttyUSB2: pl2303_open - failed submitting interrupt urb, error -28
> > Dec  2 14:07:37 alemana kernel: pl2303 ttyUSB5: pl2303_open - failed submitting interrupt urb, error -28
> > Dec  2 14:07:38 alemana kernel: pl2303 ttyUSB6: pl2303_open - failed submitting interrupt urb, error -28
> > Dec  2 14:07:41 alemana kernel: pl2303 ttyUSB2: pl2303_open - failed submitting interrupt urb, error -28
> > Dec  2 14:07:43 alemana kernel: pl2303 ttyUSB5: pl2303_open - failed submitting interrupt urb, error -28
> > Dec  2 14:07:43 alemana kernel: pl2303 ttyUSB6: pl2303_open - failed submitting interrupt urb, error -28
> > Dec  2 14:07:47 alemana kernel: pl2303 ttyUSB2: pl2303_open - failed submitting interrupt urb, error -28
> > Dec  2 14:07:48 alemana kernel: pl2303 ttyUSB5: pl2303_open - failed submitting interrupt urb, error -28
> > Dec  2 14:07:49 alemana kernel: pl2303 ttyUSB6: pl2303_open - failed submitting interrupt urb, error -28
> > 
> > The corresponding ports are not useable in that case.
> > 
> > When one googles for this error message, one finds a thread from 2006
> > with Greg KH commenting. In my case, the error doesn't hose the USB
> > subsystem, I can unplug the adapters and plug them in again one and a
> > time without a problem, and I can even use the ports that don't throw
> > this error message.
> > 
> > As in the 2006 thread, unloading the EHCI driver (ehci_hcd) solves the
> > issue, but is of course not an attractive option as soon as one wants
> > to use even a USB stick on the same machine.

I would suggest using a USB 1.1 hub instead if you have to use this kind
of hardware set up.  I think the core is just not able to schedule so
many interrupt urbs with such a setup, running USB 1.1 devices behind a
USB 2.0 hub like this is a very difficult thing to do.

Sorry I don't have a better solution.

thanks,

greg k-h
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/