iwlwifi: fix up command sending

The current command sending in iwlwifi is a bit of a mess:
 1) there is a struct, iwl_cmd, that contains both driver
    and device data in a single packed structure -- this
    is very confusing
 2) the on-stack data and the command metadata share a
    structure by embedding the latter in the former, which
    is also rather confusing because it leads to weird
    unions and similarly odd constructs
 3) each txq always has enough space for 256 commands,
    even if only 32 end up being used

This patch fixes these things:
 1) rename iwl_cmd to iwl_device_cmd and keep track of
    command metadata and device command separately, in
    two arrays in each tx queue
 2) remove the 'meta' member from iwl_host_cmd and only
    put in the required members
 3) allocate the cmd/meta arrays separately instead of
    embedding them into the txq structure

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, 10 insertions, 8 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-3945.c b/drivers/net/wireless/iwlwifi/iwl-3945.c
index 8ee403cd9b99..e1b0ef3c56a3 100644
--- a/drivers/net/wireless/iwlwifi/iwl-3945.c
+++ b/drivers/net/wireless/iwlwifi/iwl-3945.c
@@ -749,8 +749,8 @@ void iwl3945_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq)
 	/* Unmap tx_cmd */
 	if (counter)
 		pci_unmap_single(dev,
-				pci_unmap_addr(&txq->cmd[index]->meta, mapping),
-				pci_unmap_len(&txq->cmd[index]->meta, len),
+				pci_unmap_addr(&txq->meta[index], mapping),
+				pci_unmap_len(&txq->meta[index], len),
 				PCI_DMA_TODEVICE);
 
 	/* unmap chunks if any */
@@ -774,9 +774,11 @@ void iwl3945_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq)
  * iwl3945_hw_build_tx_cmd_rate - Add rate portion to TX_CMD:
  *
 */
-void iwl3945_hw_build_tx_cmd_rate(struct iwl_priv *priv, struct iwl_cmd *cmd,
-			      struct ieee80211_tx_info *info,
-			      struct ieee80211_hdr *hdr, int sta_id, int tx_id)
+void iwl3945_hw_build_tx_cmd_rate(struct iwl_priv *priv,
+				  struct iwl_device_cmd *cmd,
+				  struct ieee80211_tx_info *info,
+				  struct ieee80211_hdr *hdr,
+				  int sta_id, int tx_id)
 {
 	u16 hw_value = ieee80211_get_tx_rate(priv->hw, info)->hw_value;
 	u16 rate_index = min(hw_value & 0xffff, IWL_RATE_COUNT - 1);
@@ -1858,7 +1860,7 @@ static int iwl3945_send_rxon_assoc(struct iwl_priv *priv)
 	struct iwl_host_cmd cmd = {
 		.id = REPLY_RXON_ASSOC,
 		.len = sizeof(rxon_assoc),
-		.meta.flags = CMD_WANT_SKB,
+		.flags = CMD_WANT_SKB,
 		.data = &rxon_assoc,
 	};
 	const struct iwl_rxon_cmd *rxon1 = &priv->staging_rxon;
@@ -1882,14 +1884,14 @@ static int iwl3945_send_rxon_assoc(struct iwl_priv *priv)
 	if (rc)
 		return rc;
 
-	res = (struct iwl_rx_packet *)cmd.meta.u.skb->data;
+	res = (struct iwl_rx_packet *)cmd.reply_skb->data;
 	if (res->hdr.flags & IWL_CMD_FAILED_MSK) {
 		IWL_ERR(priv, "Bad return from REPLY_RXON_ASSOC command\n");
 		rc = -EIO;
 	}
 
 	priv->alloc_rxb_skb--;
-	dev_kfree_skb_any(cmd.meta.u.skb);
+	dev_kfree_skb_any(cmd.reply_skb);
 
 	return rc;
 }