iwlwifi: remove sync_cmd_mutex

We now use priv->mutex to serialize sync command, remove old
priv->sync_cmd_mutex and add assertion that priv->mutex must be locked.
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -2371,9 +2371,6 @@ static void __iwl_down(struct iwl_priv *priv)
 	priv->bt_full_concurrent = false;
 	priv->bt_ci_compliance = 0;
 
-	/* Unblock any waiting calls */
-	wake_up_interruptible_all(&priv->wait_command_queue);
-
 	/* Wipe out the EXIT_PENDING status bit if we are not actually
 	 * exiting the module */
 	if (!exit_pending)
@@ -3620,7 +3617,6 @@ static int iwl_init_drv(struct iwl_priv *priv)
 	INIT_LIST_HEAD(&priv->free_frames);
 
 	mutex_init(&priv->mutex);
-	mutex_init(&priv->sync_cmd_mutex);
 
 	priv->ieee_channels = NULL;
 	priv->ieee_rates = NULL;

drivers/net/wireless/iwlwifi/iwl-dev.h

@@ -1307,7 +1307,6 @@ struct iwl_priv {
 	spinlock_t hcmd_lock;	/* protect hcmd */
 	spinlock_t reg_lock;	/* protect hw register access */
 	struct mutex mutex;
-	struct mutex sync_cmd_mutex; /* enable serialization of sync commands */
 
 	/* basic pci-network driver stuff */
 	struct pci_dev *pci_dev;

drivers/net/wireless/iwlwifi/iwl-hcmd.c

@@ -171,14 +171,13 @@ int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 	int cmd_idx;
 	int ret;
 
-	BUG_ON(cmd->flags & CMD_ASYNC);
+	lockdep_assert_held(&priv->mutex);
 
 	 /* A synchronous command can not have a callback set. */
-	BUG_ON(cmd->callback);
+	BUG_ON((cmd->flags & CMD_ASYNC) || cmd->callback);
 
 	IWL_DEBUG_INFO(priv, "Attempting to send sync command %s\n",
 			get_cmd_string(cmd->id));
-	mutex_lock(&priv->sync_cmd_mutex);
 
 	set_bit(STATUS_HCMD_ACTIVE, &priv->status);
 	IWL_DEBUG_INFO(priv, "Setting HCMD_ACTIVE for command %s\n",
@@ -189,7 +188,7 @@ int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 		ret = cmd_idx;
 		IWL_ERR(priv, "Error sending %s: enqueue_hcmd failed: %d\n",
 			  get_cmd_string(cmd->id), ret);
-		goto out;
+		return ret;
 	}
 
 	ret = wait_event_interruptible_timeout(priv->wait_command_queue,
@@ -229,8 +228,7 @@ int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 		goto cancel;
 	}
 
-	ret = 0;
-	goto out;
+	return 0;
 
 cancel:
 	if (cmd->flags & CMD_WANT_SKB) {
@@ -248,8 +246,7 @@ int iwl_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 		iwl_free_pages(priv, cmd->reply_page);
 		cmd->reply_page = 0;
 	}
-out:
-	mutex_unlock(&priv->sync_cmd_mutex);
+
 	return ret;
 }