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mac80211: use spin_lock_bh() for TKIP lock

Browse source 
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>
This commit is contained in:
Johannes Berg 2013-02-13 18:03:00 +01:00
parent 65f704a52e
commit 03395003bf
2 changed files with 6 additions and 9 deletions
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10
net/mac80211/tkip.c
View file

@ -177,12 +177,11 @@ void ieee80211_get_tkip_p1k_iv(struct ieee80211_key_conf *keyconf,
struct ieee80211_key *key = (struct ieee80211_key *) struct ieee80211_key *key = (struct ieee80211_key *)
container_of(keyconf, struct ieee80211_key, conf); container_of(keyconf, struct ieee80211_key, conf);
struct tkip_ctx *ctx = &key->u.tkip.tx; 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); ieee80211_compute_tkip_p1k(key, iv32);
memcpy(p1k, ctx->p1k, sizeof(ctx->p1k)); 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); 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); const u8 *data = (u8 *)hdr + ieee80211_hdrlen(hdr->frame_control);
u32 iv32 = get_unaligned_le32(&data[4]); u32 iv32 = get_unaligned_le32(&data[4]);
u16 iv16 = data[2] | (data[0] << 8); 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); ieee80211_compute_tkip_p1k(key, iv32);
tkip_mixing_phase2(tk, ctx, iv16, p2k); 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); EXPORT_SYMBOL(ieee80211_get_tkip_p2k);

5
net/mac80211/wpa.c
View file

@ -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_hdr *hdr = (struct ieee80211_hdr *) skb->data;
struct ieee80211_key *key = tx->key; struct ieee80211_key *key = tx->key;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
unsigned long flags;
unsigned int hdrlen; unsigned int hdrlen;
int len, tail; int len, tail;
u8 *pos; u8 *pos;
@ -216,12 +215,12 @@ static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
return 0; return 0;
/* Increase IV for the frame */ /* Increase IV for the frame */
spin_lock_irqsave(&key->u.tkip.txlock, flags); spin_lock(&key->u.tkip.txlock);
key->u.tkip.tx.iv16++; key->u.tkip.tx.iv16++;
if (key->u.tkip.tx.iv16 == 0) if (key->u.tkip.tx.iv16 == 0)
key->u.tkip.tx.iv32++; key->u.tkip.tx.iv32++;
pos = ieee80211_tkip_add_iv(pos, key); 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 */ /* hwaccel - with software IV */
if (info->control.hw_key) if (info->control.hw_key)