netdev - [PATCH 1/9] ipvs: Fix possible deadlock in sync code

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Date:	Sun, 10 Aug 2008 11:07:31 +0000
From:	sven.wegener@...aler.net
To:	wensong@...ux-vs.org, horms@...ge.net.au, ja@....bg
Cc:	netdev@...r.kernel.org, lvs-devel@...r.kernel.org
Subject: [PATCH 1/9] ipvs: Fix possible deadlock in sync code

From: Sven Wegener <sven.wegener@...aler.net>

Commit 998e7a76804b7a273a0460c2cdd5a51fa9856717 ("ipvs: Use kthread_run()
instead of doing a double-fork via kernel_thread()") introduced a possible
deadlock in the sync code. We need to use the _bh versions for the lock, as the
lock is also accessed from a bottom half.

Signed-off-by: Sven Wegener <sven.wegener@...aler.net>
---
 net/ipv4/ipvs/ip_vs_sync.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/ipvs/ip_vs_sync.c b/net/ipv4/ipvs/ip_vs_sync.c
index 45e9bd9..a652da2 100644
--- a/net/ipv4/ipvs/ip_vs_sync.c
+++ b/net/ipv4/ipvs/ip_vs_sync.c
@@ -904,9 +904,9 @@ int stop_sync_thread(int state)
 		 * progress of stopping the master sync daemon.
 		 */
 
-		spin_lock(&ip_vs_sync_lock);
+		spin_lock_bh(&ip_vs_sync_lock);
 		ip_vs_sync_state &= ~IP_VS_STATE_MASTER;
-		spin_unlock(&ip_vs_sync_lock);
+		spin_unlock_bh(&ip_vs_sync_lock);
 		kthread_stop(sync_master_thread);
 		sync_master_thread = NULL;
 	} else if (state == IP_VS_STATE_BACKUP) {
-- 
1.5.6.4

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