From mboxrd@z Thu Jan 1 00:00:00 1970 From: Auke Kok Subject: Re: [PATCH] e100_shutdown: netif_poll_disable hang Date: Fri, 20 Oct 2006 13:51:44 -0700 Message-ID: <453936E0.1010204@intel.com> References: <20061020182820.978932000@mvista.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: linux-kernel@vger.kernel.org, Jesse Brandeburg , NetDev Return-path: Received: from mga01.intel.com ([192.55.52.88]:26235 "EHLO mga01.intel.com") by vger.kernel.org with ESMTP id S1946497AbWJTUxh (ORCPT ); Fri, 20 Oct 2006 16:53:37 -0400 To: Daniel Walker , Andrew Morton , Jeff Garzik In-Reply-To: <20061020182820.978932000@mvista.com> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Daniel Walker wrote: > My machine annoyingly hangs while rebooting. I tracked it down > to e100-fix-reboot-f-with-netconsole-enabled.patch in 2.6.18-rc2-mm2 > > I review the changes and it seemed to be calling netif_poll_disable > one too many time. Once in e100_down(), and again in e100_shutdown(). > > The second one in e100_shutdown() caused the hang. So this patch > removes it. > > Signed-Off-By: Daniel Walker > > --- > drivers/net/e100.c | 1 - > 1 files changed, 1 deletion(-) > > Index: linux-2.6.18/drivers/net/e100.c > =================================================================== > --- linux-2.6.18.orig/drivers/net/e100.c > +++ linux-2.6.18/drivers/net/e100.c > @@ -2709,7 +2709,6 @@ static void e100_shutdown(struct pci_dev > struct net_device *netdev = pci_get_drvdata(pdev); > struct nic *nic = netdev_priv(netdev); > > - netif_poll_disable(nic->netdev); > del_timer_sync(&nic->watchdog); > netif_carrier_off(nic->netdev); > > -- this won't help netconsole shutdown/reboot -f, probably locking it up again! NAK Also missing is the NAPI conditional, which I left out. Also missing is the same code for suspend. Here's a better approach, allowing both normal shutdown code path and reboot -f to disable polling. Cheers, Auke --- e100: disable polling only when up during suspend and shutdown Signed-off-by: Auke Kok Cc: Daniel Walker Cc: Andrew Morton --- drivers/net/e100.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) --- diff --git a/drivers/net/e100.c b/drivers/net/e100.c index d4a2572..815eb29 100644 --- a/drivers/net/e100.c +++ b/drivers/net/e100.c @@ -2719,7 +2719,10 @@ static int e100_suspend(struct pci_dev * struct net_device *netdev = pci_get_drvdata(pdev); struct nic *nic = netdev_priv(netdev); - netif_poll_disable(nic->netdev); +#ifdef CONFIG_E100_NAPI + if (netif_running(netdev)) + netif_poll_disable(nic->netdev); +#endif del_timer_sync(&nic->watchdog); netif_carrier_off(nic->netdev); @@ -2763,7 +2766,10 @@ static void e100_shutdown(struct pci_dev struct net_device *netdev = pci_get_drvdata(pdev); struct nic *nic = netdev_priv(netdev); - netif_poll_disable(nic->netdev); +#ifdef CONFIG_E100_NAPI + if (netif_running(netdev)) + netif_poll_disable(nic->netdev); +#endif del_timer_sync(&nic->watchdog); netif_carrier_off(nic->netdev);