On Saturday 12 November 2005 08:00 am, Sebastien wrote:
> Hello,
>
> My 802.11 driver queues frames to send to the device in a tailq and then
> triggers a taskqueue to actually send them. The taskqueue is required
> because I need to do two USB transfers, and wait for the first one to
> complete before I start the second : doing this asynchronously would be a
> pain.
>
> This used to work fine under FreeBSD 5, but with 6, the system randomly
> freezes without any error message, and doesn't respond to anything else
> than the big red button. The crash seems more likely to happen when there
> are 3 or more frames in the tailq when the taskqueue runs.
>
> My code is online at
> http://svnweb.tuxfamily.org/listing.php?repname=p54u+%28prism54%29&path=%2F
>&sc=0
>
> The taskqueue-related code is all in output_layer.c, and the interface with
> the 802.11 and network stack, from which the taskqueue is triggered, is in
> netif.c.
>
> The taskqueue is also trigerred from the thread created to bring the device
> up when it's detected, but it doesn't crash there (but the frames are
> queued one by one there).
>
> Any ideas ?
I don't see anything in output_layer.c Note that it's ok to hold locks over
a call to free() so that your output_free() routine could be simplified
somewhat:
mtx_lock(&sc->output_lock);
while (!TAILQ_EMPTY(&sc->output_queue) {
bf = TAILQ_FIRST(&sc->output_queue);
TAILQ_REMOVE(&sc->output_queue, bf, bf_list);
m_freem(bf->m);
free(bf, M_USBDEV);
}
mtx_destroy(&sc->output_lock);
but that is just a suggestion, I don't think it would affect your problem.
Are you able to add KDB into your kernel and break into the debugger when the
machine hangs (either via Ctrl-Alt-Esc or via a serial break over a serial
console)?
--
John Baldwin <[EMAIL PROTECTED]> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
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