# \[PATCH\] wifi: mac80211: Use the bitmap API to allocate bitmaps

- From: Christophe JAILLET \<hidden\>
- Date: 2022-07-04 19:16:18 
- List: netdev
- Page: https://ratatoskr.run/netdev/2022/07/1845945

```text
Use bitmap_zalloc()/bitmap_free() instead of hand-writing them.

It is less verbose and it improves the semantic.

Signed-off-by: Christophe JAILLET <redacted>
---
 net/mac80211/mesh_plink.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/net/mac80211/mesh_plink.c b/net/mac80211/mesh_plink.c
index 55bed9ce98fe..d67011745048 100644
--- a/net/mac80211/mesh_plink.c
+++ b/net/mac80211/mesh_plink.c
@@ -477,8 +477,7 @@ static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
 	unsigned long *aid_map;
 	int aid;
 
-	aid_map = kcalloc(BITS_TO_LONGS(IEEE80211_MAX_AID + 1),
-			  sizeof(*aid_map), GFP_KERNEL);
+	aid_map = bitmap_zalloc(IEEE80211_MAX_AID + 1, GFP_KERNEL);
 	if (!aid_map)
 		return -ENOMEM;
 
@@ -491,7 +490,7 @@ static int mesh_allocate_aid(struct ieee80211_sub_if_data *sdata)
 	rcu_read_unlock();
 
 	aid = find_first_zero_bit(aid_map, IEEE80211_MAX_AID + 1);
-	kfree(aid_map);
+	bitmap_free(aid_map);
 
 	if (aid > IEEE80211_MAX_AID)
 		return -ENOBUFS;
-- 
2.34.1

```