From mboxrd@z Thu Jan 1 00:00:00 1970 From: Anton Vorontsov Subject: [PATCH 2/3] ucc_geth: Fix netdev watchdog triggering on link changes Date: Thu, 24 Dec 2009 18:31:05 +0300 Message-ID: <20091224153105.GB1206@oksana.dev.rtsoft.ru> References: <20091224153034.GA32535@oksana.dev.rtsoft.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Cc: Lennart Sorensen , Li Yang , netdev@vger.kernel.org, linuxppc-dev@ozlabs.org To: David Miller Return-path: Received: from mail.dev.rtsoft.ru ([213.79.90.226]:50365 "HELO mail.dev.rtsoft.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754830AbZLXPbJ (ORCPT ); Thu, 24 Dec 2009 10:31:09 -0500 Content-Disposition: inline In-Reply-To: <20091224153034.GA32535@oksana.dev.rtsoft.ru> Sender: netdev-owner@vger.kernel.org List-ID: Since commit 864fdf884e82bacbe8ca5e93bd43393a61d2e2b4 ("ucc_geth: Fix hangs after switching from full to half duplex") ucc_geth driver disables the controller during MAC configuration changes. Though, disabling the controller might take quite awhile, and so the netdev watchdog might get upset: NETDEV WATCHDOG: eth2 (ucc_geth): transmit queue 0 timed out ------------[ cut here ]------------ Badness at c02729a8 [verbose debug info unavailable] NIP: c02729a8 LR: c02729a8 CTR: c01b6088 REGS: c0451c40 TRAP: 0700 Not tainted (2.6.32-trunk-8360e) [...] NIP [c02729a8] dev_watchdog+0x280/0x290 LR [c02729a8] dev_watchdog+0x280/0x290 Call Trace: [c0451cf0] [c02729a8] dev_watchdog+0x280/0x290 (unreliable) [c0451d50] [c00377c4] run_timer_softirq+0x164/0x224 [c0451da0] [c0032a38] __do_softirq+0xb8/0x13c [c0451df0] [c00065cc] do_softirq+0xa0/0xac [c0451e00] [c003280c] irq_exit+0x7c/0x9c [c0451e10] [c00640c4] __ipipe_sync_stage+0x248/0x24c [...] This patch fixes the issue by detaching the netdev during the time we change the configuration. Reported-by: Lennart Sorensen Signed-off-by: Anton Vorontsov Tested-by: Lennart Sorensen Cc: Stable [2.6.32] --- drivers/net/ucc_geth.c | 7 +++++-- 1 files changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/net/ucc_geth.c b/drivers/net/ucc_geth.c index 0f8c99e..7fff4c5 100644 --- a/drivers/net/ucc_geth.c +++ b/drivers/net/ucc_geth.c @@ -1563,7 +1563,10 @@ static int ugeth_disable(struct ucc_geth_private *ugeth, enum comm_dir mode) static void ugeth_quiesce(struct ucc_geth_private *ugeth) { - /* Wait for and prevent any further xmits. */ + /* Prevent any further xmits, plus detach the device. */ + netif_device_detach(ugeth->ndev); + + /* Wait for any current xmits to finish. */ netif_tx_disable(ugeth->ndev); /* Disable the interrupt to avoid NAPI rescheduling. */ @@ -1577,7 +1580,7 @@ static void ugeth_activate(struct ucc_geth_private *ugeth) { napi_enable(&ugeth->napi); enable_irq(ugeth->ug_info->uf_info.irq); - netif_tx_wake_all_queues(ugeth->ndev); + netif_device_attach(ugeth->ndev); } /* Called every time the controller might need to be made -- 1.6.3.3