From 1a716557a5ed3b814cb32b8be79848d53e470871 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 6 Nov 2009 14:52:51 -0800 Subject: [PATCH] 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 Signed-off-by: Reinette Chatre Signed-off-by: John W. Linville --- drivers/net/wireless/iwlwifi/iwl-dev.h | 5 +++-- drivers/net/wireless/iwlwifi/iwl-tx.c | 9 +++++++-- 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-dev.h b/drivers/net/wireless/iwlwifi/iwl-dev.h index cb2642c18da..b4e81454303 100644 --- a/drivers/net/wireless/iwlwifi/iwl-dev.h +++ b/drivers/net/wireless/iwlwifi/iwl-dev.h @@ -324,8 +324,9 @@ struct iwl_channel_info { #define IWL_MIN_NUM_QUEUES 10 /* - * uCode queue management definitions ... - * Queue #4 is the command queue for 3945/4965/5x00/1000/6x00. + * Queue #4 is the command queue for 3945/4965/5x00/1000/6x00, + * the driver maps it into the appropriate device FIFO for the + * uCode. */ #define IWL_CMD_QUEUE_NUM 4 diff --git a/drivers/net/wireless/iwlwifi/iwl-tx.c b/drivers/net/wireless/iwlwifi/iwl-tx.c index 05e75109d84..905ceca88b9 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 -- 2.46.0