iwlwifi: fix FIFO vs. queue confusion

When I added that code setting the swq_id, I evidently
did not understand the distinction between FIFO and TX
queue yet and added code to compare a queue ID and a
FIFO number, which is bogus.

However, the code there need not be this specific, it
can just set all queues to the identity mapping which
will be overwritten by the aggregation queue code. As
a bit of defensive coding, don't assign an swq_id to
the command queue so that if we ever use it for frames
we notice quickly.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c
index 05e75109d842..905ceca88b95 100644
--- a/drivers/net/wireless/iwlwifi/iwl-tx.c
+++ b/drivers/net/wireless/iwlwifi/iwl-tx.c
@@ -364,8 +364,13 @@ int iwl_tx_queue_init(struct iwl_priv *priv, struct iwl_tx_queue *txq,
 
 	txq->need_update = 0;
 
-	/* aggregation TX queues will get their ID when aggregation begins */
-	if (txq_id <= IWL_TX_FIFO_AC3)
+	/*
+	 * Aggregation TX queues will get their ID when aggregation begins;
+	 * they overwrite the setting done here. The command FIFO doesn't
+	 * need an swq_id so don't set one to catch errors, all others can
+	 * be set up to the identity mapping.
+	 */
+	if (txq_id != IWL_CMD_QUEUE_NUM)
 		txq->swq_id = txq_id;
 
 	/* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise