From mboxrd@z Thu Jan 1 00:00:00 1970 From: Veaceslav Falico Subject: [PATCH net-next] bonding: make slave status notifications GFP_ATOMIC Date: Wed, 5 Mar 2014 14:15:53 +0100 Message-ID: <1394025353-5496-1-git-send-email-vfalico@redhat.com> Cc: Veaceslav Falico , Thomas Glanzmann , Ding Tianhong , Jay Vosburgh , Andy Gospodarek To: netdev@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:23021 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752232AbaCENZZ (ORCPT ); Wed, 5 Mar 2014 08:25:25 -0500 Sender: netdev-owner@vger.kernel.org List-ID: Currently we're using GFP_KERNEL, however there are some path(s) where we can hold some spinlocks, specifically bond->curr_slave_lock: [ 4.722916] BUG: sleeping function called from invalid context at mm/slub.c:965 [ 4.724438] in_atomic(): 1, irqs_disabled(): 0, pid: 940, name: ifup-eth [ 4.726034] 5 locks held by ifup-eth/940: ...snip... [ 4.734646] #4: (&bond->curr_slave_lock){+...+.}, at: [] bond_enslave+0xda6/0xdd0 [bonding] ...snip... [ 4.759081] [] bond_change_active_slave+0x191/0x3b0 [bonding] [ 4.760917] [] bond_select_active_slave+0xf7/0x1d0 [bonding] [ 4.762751] [] bond_enslave+0xdae/0xdd0 [bonding] ...snip... As it's out of hot path and is a really rare event - change the gfp_t flags to GFP_ATOMIC to avoid sleeping under spinlock. CC: Thomas Glanzmann CC: Ding Tianhong CC: Jay Vosburgh CC: Andy Gospodarek Signed-off-by: Veaceslav Falico --- drivers/net/bonding/bonding.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h index 4303628..4cd451d 100644 --- a/drivers/net/bonding/bonding.h +++ b/drivers/net/bonding/bonding.h @@ -292,7 +292,7 @@ static inline void bond_set_active_slave(struct slave *slave) { if (slave->backup) { slave->backup = 0; - rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_KERNEL); + rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC); } } @@ -300,7 +300,7 @@ static inline void bond_set_backup_slave(struct slave *slave) { if (!slave->backup) { slave->backup = 1; - rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_KERNEL); + rtmsg_ifinfo(RTM_NEWLINK, slave->dev, 0, GFP_ATOMIC); } } -- 1.8.4