# \[PATCH\] mac80211: scan: Replace rcu\_assign\_pointer() with RCU\_INIT\_POINTER()

- From: Andreea-Cristina Bernat \<hidden\>
- Date: 2014-08-22 13:15:00 
- List: linux-wireless
- Page: https://ratatoskr.run/linux-wireless/2014/08/4319329
- Thread: https://ratatoskr.run/linux-wireless/2014/08/4319329/t.md

```text
The use of "rcu_assign_pointer()" is NULLing out the pointer.
According to RCU_INIT_POINTER()'s block comment:
"1.   This use of RCU_INIT_POINTER() is NULLing out the pointer"
it is better to use it instead of rcu_assign_pointer() because it has a
smaller overhead.

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

- rcu_assign_pointer
+ RCU_INIT_POINTER
  (..., NULL)

Signed-off-by: Andreea-Cristina Bernat <redacted>
---
 net/mac80211/scan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index f40661e..6c69d09 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -1058,7 +1058,7 @@ int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata)
 	if (rcu_access_pointer(local->sched_scan_sdata)) {
 		ret = drv_sched_scan_stop(local, sdata);
 		if (!ret)
-			rcu_assign_pointer(local->sched_scan_sdata, NULL);
+			RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
 	}
 out:
 	mutex_unlock(&local->mtx);
-- 
1.9.1

```