mrf24j40: Move INIT_COMPLETION() to before packet transmission

This avoids a race condition where complete(tx_complete) could be called
before tx_complete is initialized.
Signed-off-by: Alan Ott <alan@signal11.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ieee802154/mrf24j40.c

@@ -344,6 +344,8 @@ static int mrf24j40_tx(struct ieee802154_dev *dev, struct sk_buff *skb)
 	if (ret)
 		goto err;
 
+	INIT_COMPLETION(devrec->tx_complete);
+
 	/* Set TXNTRIG bit of TXNCON to send packet */
 	ret = read_short_reg(devrec, REG_TXNCON, &val);
 	if (ret)
@@ -354,8 +356,6 @@ static int mrf24j40_tx(struct ieee802154_dev *dev, struct sk_buff *skb)
 		val |= 0x4;
 	write_short_reg(devrec, REG_TXNCON, val);
 
-	INIT_COMPLETION(devrec->tx_complete);
-
 	/* Wait for the device to send the TX complete interrupt. */
 	ret = wait_for_completion_interruptible_timeout(
 						&devrec->tx_complete,