Messages in this thread | | | Date | Fri, 09 Mar 2007 23:30:26 +0000 | From | Simon Arlott <> | Subject | Re: netconsole system freeze when cable unplugged |
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On 09/03/07 20:42, Francois Romieu wrote: > Simon Arlott <simon@fire.lp0.eu> : >> When I unplug the cable the system just stops responding to anything, >> at all. No message is printed to the console when the cable is plugged >> back in. > > rtl8139_interrupt (spin_lock(&tp->lock)) > -> rtl8139_weird_interrupt > -> rtl_check_media > -> mii_check_media (printk(KERN_INFO "%s: link down\n", ...)) > [netpoll stuff here] > -> rtl8139_poll_controller > -> rtl8139_interrupt > *deadlock* > > See below for my random stuff of the day. Feel free to open a PR at > bugzilla.kernel.org if the issue does not go away.
The patch doesn't fix it, nothing changes. I'm not sure how this can be debugged if printk won't work...
> --------8<----------------------------------------------------------------- > > 8139too: netconsole breakage when link changes > > rtl8139_interrupt is not supposed to be reentrant but its link > management part can emit printk. > > Signed-off-by: Francois Romieu <romieu@fr.zoreil.com> > > diff --git a/drivers/net/8139too.c b/drivers/net/8139too.c > index 99304b2..64467ad 100644 > --- a/drivers/net/8139too.c > +++ b/drivers/net/8139too.c > @@ -2215,9 +2215,16 @@ static irqreturn_t rtl8139_interrupt (int irq, void *dev_instance) > */ > static void rtl8139_poll_controller(struct net_device *dev) > { > - disable_irq(dev->irq); > + struct rtl8139_private *tp = netdev_priv(dev); > + unsigned long flags; > + int rc; > + > + rc = spin_trylock_irqsave(&tp->lock, flags); > + if (!rc) > + return; > + spin_unlock(&tp->lock); > rtl8139_interrupt(dev->irq, dev); > - enable_irq(dev->irq); > + local_irq_restore(flags); > } > #endif > > - > To unsubscribe from this list: send the line "unsubscribe netdev" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
-- Simon Arlott - 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/
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