net: mac802154: Rename the main tx_work struct

This entry is dedicated to synchronous transmissions done by drivers
without async hook. Make this clearer that this is not a work that any
driver can use by at least prefixing it with "sync_". While at it, let's
enhance the comment explaining why we choose one or the other.
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Link: https://lore.kernel.org/r/20220519150516.443078-3-miquel.raynal@bootlin.comSigned-off-by: Stefan Schmidt <stefan@datenfreihafen.org>

net/mac802154/ieee802154_i.h

@@ -55,7 +55,7 @@ struct ieee802154_local {
 	struct sk_buff_head skb_queue;
 
 	struct sk_buff *tx_skb;
-	struct work_struct tx_work;
+	struct work_struct sync_tx_work;
 	/* A negative Linux error code or a null/positive MLME error status */
 	int tx_result;
 };

net/mac802154/main.c

@@ -95,7 +95,7 @@ ieee802154_alloc_hw(size_t priv_data_len, const struct ieee802154_ops *ops)
 
 	skb_queue_head_init(&local->skb_queue);
 
-	INIT_WORK(&local->tx_work, ieee802154_xmit_sync_worker);
+	INIT_WORK(&local->sync_tx_work, ieee802154_xmit_sync_worker);
 
 	/* init supported flags with 802.15.4 default ranges */
 	phy->supported.max_minbe = 8;

net/mac802154/tx.c

@@ -25,7 +25,7 @@
 void ieee802154_xmit_sync_worker(struct work_struct *work)
 {
 	struct ieee802154_local *local =
-		container_of(work, struct ieee802154_local, tx_work);
+		container_of(work, struct ieee802154_local, sync_tx_work);
 	struct sk_buff *skb = local->tx_skb;
 	struct net_device *dev = skb->dev;
 	int res;
@@ -76,7 +76,10 @@ ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
 	/* Stop the netif queue on each sub_if_data object. */
 	ieee802154_stop_queue(&local->hw);
 
-	/* async is priority, otherwise sync is fallback */
+	/* Drivers should preferably implement the async callback. In some rare
+	 * cases they only provide a sync callback which we will use as a
+	 * fallback.
+	 */
 	if (local->ops->xmit_async) {
 		unsigned int len = skb->len;
 
@@ -90,7 +93,7 @@ ieee802154_tx(struct ieee802154_local *local, struct sk_buff *skb)
 		dev->stats.tx_bytes += len;
 	} else {
 		local->tx_skb = skb;
-		queue_work(local->workqueue, &local->tx_work);
+		queue_work(local->workqueue, &local->sync_tx_work);
 	}
 
 	return NETDEV_TX_OK;