On 04/07/2010 02:32 PM, Alan Stern wrote: > On Wed, 7 Apr 2010, Anders Darander wrote: > > >> Hi all, >> >> I've got some problems using an FTDI-based USB-RS232-adapter for the >> system console. >> If I'm adding a VGA console, I get flooded by "ftdi_sio: ftdi_write - >> failed submitting write urb, error -108"-messages upon poweroff. (And >> it hangs in such a loop, as each printk generates a new printk). >> >> I've found the following thread, >> http://www.kerneltrap.com/mailarchive/linux-usb/2008/12/8/4342894/thread, >> from 2008, which describes the same problem. >> >> However, I've not been able to find a patch for this. >> Did someone find a solution? Or should I try to make my own workaround... >> I'm running a 2.6.32.13-kernel on an Intel atom-based platform. >> > > You should also ask Jason Wessel (CC'ed). He has spent a lot of time > working on usb-serial console support. > > (Although in this case, it looks like the problem has an easy fix.) > > What kind of easy fix did you have in mind Alan? Previously I shuffled around the error messages to avoid this problem with one of the drivers, but that is definitely not the right fix, as it only fixes a single driver. I have not looked at this code in a while, but I believe the right fix is to look for the connected condition in the usb serial console high level console code, as well as to simply have a recursion check. Certainly, there are several ways the problem could be addressed. Jason. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
