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

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Date:	Sun, 17 Aug 2014 16:39:16 +0300
From:	Andreea-Cristina Bernat <bernat.ada@...il.com>
To:	gregkh@...uxfoundation.org, Larry.Finger@...inger.net,
	navin.patidar@...il.com, davem@...emloft.net, jasowang@...hat.com,
	stsp@...rs.sourceforge.net, dborkman@...hat.com,
	Jes.Sorensen@...hat.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Cc:	paulmck@...ux.vnet.ibm.com
Subject: [PATCH] os_dep: 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/staging/rtl8188eu/os_dep/os_intfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8188eu/os_dep/os_intfs.c b/drivers/staging/rtl8188eu/os_dep/os_intfs.c
index 0e0c32d..4bb76e5 100644
--- a/drivers/staging/rtl8188eu/os_dep/os_intfs.c
+++ b/drivers/staging/rtl8188eu/os_dep/os_intfs.c
@@ -1010,7 +1010,7 @@ void netdev_br_init(struct net_device *netdev)
 
 	rcu_read_lock();
 
-	if (rcu_dereference(adapter->pnetdev->rx_handler_data)) {
+	if (rcu_access_pointer(adapter->pnetdev->rx_handler_data)) {
 		struct net_device *br_netdev;
 		struct net *devnet = NULL;
 
-- 
1.9.1

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