iwlwifi: clear ieee80211_tx_info->driver_data in the op_mode

The transport will need to use the info->driver_data
pointers. Since the op_mode has this memory hot in cache,
clear it there.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

drivers/net/wireless/intel/iwlwifi/dvm/tx.c

@@ -383,6 +383,7 @@ int iwlagn_tx_skb(struct iwl_priv *priv,
 	iwlagn_tx_cmd_build_rate(priv, tx_cmd, info, sta, fc);
 
 	memset(&info->status, 0, sizeof(info->status));
+	memset(info->driver_data, 0, sizeof(info->driver_data));
 
 	info->driver_data[0] = ctx;
 	info->driver_data[1] = dev_cmd;

drivers/net/wireless/intel/iwlwifi/iwl-trans.h

@@ -552,7 +552,8 @@ struct iwl_trans_txq_scd_cfg {
  *	If RFkill is asserted in the middle of a SYNC host command, it must
  *	return -ERFKILL straight away.
  *	May sleep only if CMD_ASYNC is not set
- * @tx: send an skb
+ * @tx: send an skb. The transport relies on the op_mode to zero the
+ *	the ieee80211_tx_info->driver_data.
  *	Must be atomic
  * @reclaim: free packet until ssn. Returns a list of freed packets.
  *	Must be atomic

drivers/net/wireless/intel/iwlwifi/mvm/tx.c

@@ -346,8 +346,8 @@ iwl_mvm_set_tx_params(struct iwl_mvm *mvm, struct sk_buff *skb,
 	iwl_mvm_set_tx_cmd_rate(mvm, tx_cmd, info, sta, hdr->frame_control);
 
 	memset(&info->status, 0, sizeof(info->status));
+	memset(info->driver_data, 0, sizeof(info->driver_data));
 
-	info->driver_data[0] = NULL;
 	info->driver_data[1] = dev_cmd;
 
 	return dev_cmd;