s390/qeth: simplify L3 dev_id logic

The logic that deals with errors from qeth_l3_get_unique_id() is quite
complex: it sets card->unique_id to 0xfffe, additionally flags it as
UNIQUE_ID_NOT_BY_CARD and later takes this flag as cue to not propagate
card->unique_id to dev->dev_id. With dev->dev_id thus holding 0,
addrconf_ifid_eui48() applies its default behaviour.

Get rid of all the special bit masks, and just return the old uid in
case of an error. For the vast majority of cases this will be 0 (and so
we still get the desired default behaviour) - with the rare exception
where qeth_l3_get_unique_id() might have been called earlier but the
initialization then failed at a later point.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 13 insertions, 17 deletions

diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 83ae75cf1389..b48cd0df3e31 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -949,39 +949,36 @@ static int qeth_l3_get_unique_id_cb(struct qeth_card *card,
 		struct qeth_reply *reply, unsigned long data)
 {
 	struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *) data;
+	u16 *uid = reply->param;
 
 	if (cmd->hdr.return_code == 0) {
-		card->info.unique_id = cmd->data.create_destroy_addr.uid;
+		*uid = cmd->data.create_destroy_addr.uid;
 		return 0;
 	}
 
-	card->info.unique_id = UNIQUE_ID_IF_CREATE_ADDR_FAILED |
-			       UNIQUE_ID_NOT_BY_CARD;
 	dev_warn(&card->gdev->dev, "The network adapter failed to generate a unique ID\n");
 	return -EIO;
 }
 
-static int qeth_l3_get_unique_id(struct qeth_card *card)
+static u16 qeth_l3_get_unique_id(struct qeth_card *card, u16 uid)
 {
-	int rc = 0;
 	struct qeth_cmd_buffer *iob;
 
 	QETH_CARD_TEXT(card, 2, "guniqeid");
 
-	if (!qeth_is_supported(card, IPA_IPV6)) {
-		card->info.unique_id =  UNIQUE_ID_IF_CREATE_ADDR_FAILED |
-					UNIQUE_ID_NOT_BY_CARD;
-		return 0;
-	}
+	if (!qeth_is_supported(card, IPA_IPV6))
+		goto out;
 
 	iob = qeth_ipa_alloc_cmd(card, IPA_CMD_CREATE_ADDR, QETH_PROT_IPV6,
 				 IPA_DATA_SIZEOF(create_destroy_addr));
 	if (!iob)
-		return -ENOMEM;
+		goto out;
 
-	__ipa_cmd(iob)->data.create_destroy_addr.uid = card->info.unique_id;
-	rc = qeth_send_ipa_cmd(card, iob, qeth_l3_get_unique_id_cb, NULL);
-	return rc;
+	__ipa_cmd(iob)->data.create_destroy_addr.uid = uid;
+	qeth_send_ipa_cmd(card, iob, qeth_l3_get_unique_id_cb, &uid);
+
+out:
+	return uid;
 }
 
 static int
@@ -1920,6 +1917,7 @@ static const struct net_device_ops qeth_l3_osa_netdev_ops = {
 
 static int qeth_l3_setup_netdev(struct qeth_card *card)
 {
+	struct net_device *dev = card->dev;
 	unsigned int headroom;
 	int rc;
 
@@ -1937,9 +1935,7 @@ static int qeth_l3_setup_netdev(struct qeth_card *card)
 		card->dev->netdev_ops = &qeth_l3_osa_netdev_ops;
 
 		/*IPv6 address autoconfiguration stuff*/
-		qeth_l3_get_unique_id(card);
-		if (!(card->info.unique_id & UNIQUE_ID_NOT_BY_CARD))
-			card->dev->dev_id = card->info.unique_id & 0xffff;
+		dev->dev_id = qeth_l3_get_unique_id(card, dev->dev_id);
 
 		if (!IS_VM_NIC(card)) {
 			card->dev->features |= NETIF_F_SG;