iwlegacy: 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>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -1077,7 +1077,6 @@ 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/iwlegacy/iwl-hcmd.c

@@ -145,6 +145,8 @@ int iwl_legacy_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 	int cmd_idx;
 	int ret;
 
+	lockdep_assert_held(&priv->mutex);
+
 	BUG_ON(cmd->flags & CMD_ASYNC);
 
 	 /* A synchronous command can not have a callback set. */
@@ -152,7 +154,6 @@ int iwl_legacy_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 
 	IWL_DEBUG_INFO(priv, "Attempting to send sync command %s\n",
 			iwl_legacy_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",
@@ -224,7 +225,6 @@ int iwl_legacy_send_cmd_sync(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
 		cmd->reply_page = 0;
 	}
 out:
-	mutex_unlock(&priv->sync_cmd_mutex);
 	return ret;
 }
 EXPORT_SYMBOL(iwl_legacy_send_cmd_sync);

drivers/net/wireless/iwlegacy/iwl3945-base.c

@@ -3815,7 +3815,6 @@ static int iwl3945_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/iwlegacy/iwl4965-base.c

@@ -3124,7 +3124,6 @@ static int iwl4965_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;