Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965429Ab3CZPbz (ORCPT ); Tue, 26 Mar 2013 11:31:55 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:54132 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965385Ab3CZPXy (ORCPT ); Tue, 26 Mar 2013 11:23:54 -0400 From: Luis Henriques To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Ben Hutchings , Luis Henriques Subject: [PATCH 130/150] sfc: lock TX queues when calling netif_device_detach() Date: Tue, 26 Mar 2013 15:20:29 +0000 Message-Id: <1364311249-14454-131-git-send-email-luis.henriques@canonical.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1364311249-14454-1-git-send-email-luis.henriques@canonical.com> References: <1364311249-14454-1-git-send-email-luis.henriques@canonical.com> X-Extended-Stable: 3.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2997 Lines: 85 3.5.7.9 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Daniel Pieczko commit c2f3b8e3a44b6fe9e36704e30157ebe1a88c08b1 upstream. The assertion of netif_device_present() at the top of efx_hard_start_xmit() may fail if we don't do this. Signed-off-by: Ben Hutchings Signed-off-by: Luis Henriques --- drivers/net/ethernet/sfc/efx.c | 5 ++--- drivers/net/ethernet/sfc/efx.h | 13 +++++++++++++ drivers/net/ethernet/sfc/selftest.c | 2 +- 3 files changed, 16 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 16c4634..3d49f44 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -2224,7 +2224,7 @@ int efx_reset(struct efx_nic *efx, enum reset_type method) netif_info(efx, drv, efx->net_dev, "resetting (%s)\n", RESET_TYPE(method)); - netif_device_detach(efx->net_dev); + efx_device_detach_sync(efx); efx_reset_down(efx, method); rc = efx->type->reset(efx, method); @@ -2718,8 +2718,7 @@ static int efx_pm_freeze(struct device *dev) struct efx_nic *efx = pci_get_drvdata(to_pci_dev(dev)); efx->state = STATE_FINI; - - netif_device_detach(efx->net_dev); + efx_device_detach_sync(efx); efx_stop_all(efx); efx_stop_interrupts(efx, false); diff --git a/drivers/net/ethernet/sfc/efx.h b/drivers/net/ethernet/sfc/efx.h index 70755c9..320cf7b 100644 --- a/drivers/net/ethernet/sfc/efx.h +++ b/drivers/net/ethernet/sfc/efx.h @@ -162,4 +162,17 @@ extern void efx_link_status_changed(struct efx_nic *efx); extern void efx_link_set_advertising(struct efx_nic *efx, u32); extern void efx_link_set_wanted_fc(struct efx_nic *efx, u8); +static inline void efx_device_detach_sync(struct efx_nic *efx) +{ + struct net_device *dev = efx->net_dev; + + /* Lock/freeze all TX queues so that we can be sure the + * TX scheduler is stopped when we're done and before + * netif_device_present() becomes false. + */ + netif_tx_lock(dev); + netif_device_detach(dev); + netif_tx_unlock(dev); +} + #endif /* EFX_EFX_H */ diff --git a/drivers/net/ethernet/sfc/selftest.c b/drivers/net/ethernet/sfc/selftest.c index 5f5b160..4a51ea3 100644 --- a/drivers/net/ethernet/sfc/selftest.c +++ b/drivers/net/ethernet/sfc/selftest.c @@ -721,7 +721,7 @@ int efx_selftest(struct efx_nic *efx, struct efx_self_tests *tests, /* Detach the device so the kernel doesn't transmit during the * loopback test and the watchdog timeout doesn't fire. */ - netif_device_detach(efx->net_dev); + efx_device_detach_sync(efx); if (efx->type->test_chip) { rc_reset = efx->type->test_chip(efx, tests); -- 1.8.1.2 -- 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/