[PATCH] net: consolidate lock/unlock into unlock_wait

[Nicholas Mc Guire]

The spin_lock()/spin_unlock() is synchronizing on the adapter->work_lock
as the comment also suggests, which is equivalent to spin_unlock_wait()
but the later should be more efficient.

Signed-off-by: Nicholas Mc Guire <hofrat@xxxxxxxxx>
---

Problem located by coccinelle spatch

Patch was compile tested with: x86_64_defconfig + CONFIG_CHELSIO_T1=m

Patch is against linux-next (localversion-next is next-20160318)

 drivers/net/ethernet/chelsio/cxgb/cxgb2.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb/cxgb2.c b/drivers/net/ethernet/chelsio/cxgb/cxgb2.c
index f5f1b0b..c5a38dc 100644
--- a/drivers/net/ethernet/chelsio/cxgb/cxgb2.c
+++ b/drivers/net/ethernet/chelsio/cxgb/cxgb2.c
@@ -282,8 +282,8 @@ static int cxgb_close(struct net_device *dev)
 	    !(adapter->open_device_map & PORT_MASK)) {
 		/* Stop statistics accumulation. */
 		smp_mb__after_atomic();
-		spin_lock(&adapter->work_lock);   /* sync with update task */
-		spin_unlock(&adapter->work_lock);
+		/* sync with update task */
+		spin_unlock_wait(&adapter->work_lock);
 		cancel_mac_stats_update(adapter);
 	}
 
-- 
2.1.4