mac80211: use spin_lock_bh() for TKIP lock

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 <johannes.berg@intel.com>

diff --git a/net/mac80211/tkip.c b/net/mac80211/tkip.c
index 57e14d5..3ed801d 100644 (file)
--- 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 (file)
--- 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)