linux-kernel - [PATCH] carl9170: Replace rcu_dereference() with rcu_access

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Date:	Sun, 17 Aug 2014 13:48:07 +0300
From:	Andreea-Cristina Bernat <bernat.ada@...il.com>
To:	chunkeey@...glemail.com, linville@...driver.com,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	paulmck@...ux.vnet.ibm.com
Subject: [PATCH] carl9170: Replace rcu_dereference() with rcu_access_pointer()

The rcu_dereference() call is used directly in a condition.
Since its return value is never dereferenced it is recommended to use
"rcu_access_pointer()" instead of "rcu_dereference()".
Therefore, this patch makes the replacement.

The following Coccinelle semantic patch was used:
@@
@@

(
 if(
 (<+...
- rcu_dereference
+ rcu_access_pointer
  (...)
  ...+>)) {...}
|
  while(
  (<+...
- rcu_dereference
+ rcu_access_pointer
  (...)
  ...+>)) {...}
)

Signed-off-by: Andreea-Cristina Bernat <bernat.ada@...il.com>
---
 drivers/net/wireless/ath/carl9170/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/carl9170/main.c b/drivers/net/wireless/ath/carl9170/main.c
index f8ded84..12018ff 100644
--- a/drivers/net/wireless/ath/carl9170/main.c
+++ b/drivers/net/wireless/ath/carl9170/main.c
@@ -1431,7 +1431,7 @@ static int carl9170_op_ampdu_action(struct ieee80211_hw *hw,
 			return -EOPNOTSUPP;
 
 		rcu_read_lock();
-		if (rcu_dereference(sta_info->agg[tid])) {
+		if (rcu_access_pointer(sta_info->agg[tid])) {
 			rcu_read_unlock();
 			return -EBUSY;
 		}
-- 
1.9.1

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