ipvs: Fix possible deadlock in sync code

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@stealer.net>
Acked-by: Simon Horman <horms@verge.net.au>

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 45e9bd96c286..a652da2c3200 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) {