lkml.org 
[lkml]   [2004]   [Jun]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: USBDEVFS_RESET deadlocks USB bus.
On Fri, Jun 04, 2004 at 03:39:11PM -0400, Zephaniah E. Hull wrote:
> Starting at 2.6.7-rc1 or so (that is when we first noticed it) the new
> pilot-link libusb back end started deadlocking the entire USB bus that
> the palm device was on.
>
> I have finally tracked it down to happening when we make the
> USBDEVFS_RESET ioctl, we never return from it and from that point on the
> bus in question is completely dead, no processing is done, no
> notifications of devices being plugged in or unplugged.
>
> This is still happening in 2.6.7-rc2-mm1.
>
> It seems to happen with both the UHCI and OHCI back ends, so it is
> probably above that.
>
> Given that there were heavy locking changes, I suspect that the case in
> question got screwed up somehow.

This needs to go to the linux-usb-devel list, now CC:

Anyway, can you look at the output of SysRq-T and see where the
processes are hung?

thanks,

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

\
 
 \ /
  Last update: 2005-03-22 14:03    [W:0.082 / U:0.368 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site