From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ben Hutchings Subject: [PATCH net-next 11/13] sfc: lock TX queues when calling netif_device_detach() Date: Sat, 1 Dec 2012 04:44:06 +0000 Message-ID: <1354337046.2640.50.camel@bwh-desktop.uk.solarflarecom.com> References: <1354336821.2640.39.camel@bwh-desktop.uk.solarflarecom.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: , To: David Miller Return-path: Received: from webmail.solarflare.com ([12.187.104.25]:26193 "EHLO webmail.solarflare.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751808Ab2LAEoK (ORCPT ); Fri, 30 Nov 2012 23:44:10 -0500 In-Reply-To: <1354336821.2640.39.camel@bwh-desktop.uk.solarflarecom.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Daniel Pieczko 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 --- drivers/net/ethernet/sfc/efx.c | 4 ++-- drivers/net/ethernet/sfc/efx.h | 13 +++++++++++++ drivers/net/ethernet/sfc/selftest.c | 2 +- 3 files changed, 16 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 4f86d0c..6f073d0 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -2279,7 +2279,7 @@ 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); @@ -2758,7 +2758,7 @@ static int efx_pm_freeze(struct device *dev) if (efx->state != STATE_DISABLED) { efx->state = STATE_UNINIT; - 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 f11170b..50247df 100644 --- a/drivers/net/ethernet/sfc/efx.h +++ b/drivers/net/ethernet/sfc/efx.h @@ -163,4 +163,17 @@ 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 f6651d3..2069f51 100644 --- a/drivers/net/ethernet/sfc/selftest.c +++ b/drivers/net/ethernet/sfc/selftest.c @@ -722,7 +722,7 @@ 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); -- 1.7.7.6 -- Ben Hutchings, Staff Engineer, Solarflare Not speaking for my employer; that's the marketing department's job. They asked us to note that Solarflare product names are trademarked.