iwlwifi: reduce sta_lock hold time in TX

When we TX, we hold the sta_lock for a long
time, a lot of which isn't needed. Reduce
the time we hold the lock. Note that this
doesn't really change anything as the code
is already under the other spinlock, but it
makes the code easier to read.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
index 81a3b0e3a8e0113ec6ff3f47a8193b00c97cd9fc..59509d80f73f983afb35152c7b6351ee20f17dbb 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn-tx.c
@@ -341,13 +341,10 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
        if (info->flags & IEEE80211_TX_CTL_AMPDU)
                is_agg = true;
 
-       /* irqs already disabled/saved above when locking priv->shrd->lock */
-       spin_lock(&priv->shrd->sta_lock);
-
        dev_cmd = kmem_cache_alloc(priv->tx_cmd_pool, GFP_ATOMIC);
 
        if (unlikely(!dev_cmd))
-               goto drop_unlock_sta;
+               goto drop_unlock_priv;
 
        memset(dev_cmd, 0, sizeof(*dev_cmd));
        tx_cmd = (struct iwl_tx_cmd *) dev_cmd->payload;
@@ -372,6 +369,9 @@ int iwlagn_tx_skb(struct iwl_priv *priv, struct sk_buff *skb)
        info->driver_data[0] = ctx;
        info->driver_data[1] = dev_cmd;
 
+       /* irqs already disabled/saved above when locking priv->shrd->lock */
+       spin_lock(&priv->shrd->sta_lock);
+
        if (ieee80211_is_data_qos(fc) && !ieee80211_is_qos_nullfunc(fc)) {
                u8 *qc = NULL;
                struct iwl_tid_data *tid_data;