mac80211: use spin_lock_bh() for TKIP lock

Commit Message

Johannes Berg Feb. 13, 2013, 5:04 p.m. UTC

From: Johannes Berg <[e-mail]>

Since no driver calls the TKIP functions from interrupt
context, there's no need to use spin_lock_irqsave().
Just use spin_lock_bh() (and spin_lock() in the TX path
where we're in a BH or they're already disabled.)

Signed-off-by: Johannes Berg <[e-mail]>
---
 net/mac80211/tkip.c | 10 ++++------
 net/mac80211/wpa.c  |  5 ++---
 2 files changed, 6 insertions(+), 9 deletions(-)

Comments

Johannes Berg Feb. 14, 2013, 5:36 p.m. UTC | #1

On Wed, 2013-02-13 at 18:04 +0100, Johannes Berg wrote:
> From: Johannes Berg <[e-mail]>
> 
> Since no driver calls the TKIP functions from interrupt
> context, there's no need to use spin_lock_irqsave().
> Just use spin_lock_bh() (and spin_lock() in the TX path
> where we're in a BH or they're already disabled.)

Applied.

johannes

--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to [e-mail]
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Patch

diff --git a/net/mac80211/tkip.c b/net/mac80211/tkip.c
index 57e14d5..3ed801d 100644
--- a/net/mac80211/tkip.c
+++ b/net/mac80211/tkip.c
@@ -177,12 +177,11 @@  void ieee80211_get_tkip_p1k_iv(struct ieee80211_key_conf *keyconf,
 	struct ieee80211_key *key = (struct ieee80211_key *)
 			container_of(keyconf, struct ieee80211_key, conf);
 	struct tkip_ctx *ctx = &key->u.tkip.tx;
-	unsigned long flags;
 
-	spin_lock_irqsave(&key->u.tkip.txlock, flags);
+	spin_lock_bh(&key->u.tkip.txlock);
 	ieee80211_compute_tkip_p1k(key, iv32);
 	memcpy(p1k, ctx->p1k, sizeof(ctx->p1k));
-	spin_unlock_irqrestore(&key->u.tkip.txlock, flags);
+	spin_unlock_bh(&key->u.tkip.txlock);
 }
 EXPORT_SYMBOL(ieee80211_get_tkip_p1k_iv);
 
@@ -208,12 +207,11 @@  void ieee80211_get_tkip_p2k(struct ieee80211_key_conf *keyconf,
 	const u8 *data = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
 	u32 iv32 = get_unaligned_le32(&data[4]);
 	u16 iv16 = data[2] | (data[0] << 8);
-	unsigned long flags;
 
-	spin_lock_irqsave(&key->u.tkip.txlock, flags);
+	spin_lock_bh(&key->u.tkip.txlock);
 	ieee80211_compute_tkip_p1k(key, iv32);
 	tkip_mixing_phase2(tk, ctx, iv16, p2k);
-	spin_unlock_irqrestore(&key->u.tkip.txlock, flags);
+	spin_unlock_bh(&key->u.tkip.txlock);
 }
 EXPORT_SYMBOL(ieee80211_get_tkip_p2k);
 
diff --git a/net/mac80211/wpa.c b/net/mac80211/wpa.c
index c175ee8..c7c6d64 100644
--- a/net/mac80211/wpa.c
+++ b/net/mac80211/wpa.c
@@ -181,7 +181,6 @@  static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
 	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 	struct ieee80211_key *key = tx->key;
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
-	unsigned long flags;
 	unsigned int hdrlen;
 	int len, tail;
 	u8 *pos;
@@ -216,12 +215,12 @@  static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
 		return 0;
 
 	/* Increase IV for the frame */
-	spin_lock_irqsave(&key->u.tkip.txlock, flags);
+	spin_lock(&key->u.tkip.txlock);
 	key->u.tkip.tx.iv16++;
 	if (key->u.tkip.tx.iv16 == 0)
 		key->u.tkip.tx.iv32++;
 	pos = ieee80211_tkip_add_iv(pos, key);
-	spin_unlock_irqrestore(&key->u.tkip.txlock, flags);
+	spin_unlock(&key->u.tkip.txlock);
 
 	/* hwaccel - with software IV */
 	if (info->control.hw_key)