iwlagn: use mutex for aggregation

Now that the ampdu_action callback can sleep,
we can use the mutex to properly protect the
aggregation data, and return useful errors if
they should happen.

Also, add some sleep and mutex debugging so
we won't call any of the functions that now
require being able to sleep and/or the mutex
to be held in an invalid context.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Acked-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-4965.c b/drivers/net/wireless/iwlwifi/iwl-4965.c
index 83e6a42ca2da..fee276bc36fe 100644
--- a/drivers/net/wireless/iwlwifi/iwl-4965.c
+++ b/drivers/net/wireless/iwlwifi/iwl-4965.c
@@ -1785,6 +1785,7 @@ static int iwl4965_txq_agg_enable(struct iwl_priv *priv, int txq_id,
 {
         unsigned long flags;
         u16 ra_tid;
+        int ret;
 
         if ((IWL49_FIRST_AMPDU_QUEUE > txq_id) ||
             (IWL49_FIRST_AMPDU_QUEUE + priv->cfg->num_of_ampdu_queues
@@ -1800,7 +1801,9 @@ static int iwl4965_txq_agg_enable(struct iwl_priv *priv, int txq_id,
         ra_tid = BUILD_RAxTID(sta_id, tid);
 
         /* Modify device's station table to Tx this TID */
-        iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
+        ret = iwl_sta_tx_modify_enable_tid(priv, sta_id, tid);
+        if (ret)
+                return ret;
 
         spin_lock_irqsave(&priv->lock, flags);