qeth: synchronize configuration interface

Synchronize access to the drivers configuration interface.
Also do not allow configuration changes during online/offline
transition.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 135 insertions, 109 deletions

diff --git a/drivers/s390/net/qeth_l3_sys.c b/drivers/s390/net/qeth_l3_sys.c
index 25b3e7aae44f..fb5318b30e99 100644
--- a/drivers/s390/net/qeth_l3_sys.c
+++ b/drivers/s390/net/qeth_l3_sys.c
@@ -70,10 +70,10 @@ static ssize_t qeth_l3_dev_route_store(struct qeth_card *card,
 {
 	enum qeth_routing_types old_route_type = route->type;
 	char *tmp;
-	int rc;
+	int rc = 0;
 
 	tmp = strsep((char **) &buf, "\n");
-
+	mutex_lock(&card->conf_mutex);
 	if (!strcmp(tmp, "no_router")) {
 		route->type = NO_ROUTER;
 	} else if (!strcmp(tmp, "primary_connector")) {
@@ -87,7 +87,8 @@ static ssize_t qeth_l3_dev_route_store(struct qeth_card *card,
 	} else if (!strcmp(tmp, "multicast_router")) {
 		route->type = MULTICAST_ROUTER;
 	} else {
-		return -EINVAL;
+		rc = -EINVAL;
+		goto out;
 	}
 	if (((card->state == CARD_STATE_SOFTSETUP) ||
 	     (card->state == CARD_STATE_UP)) &&
@@ -97,7 +98,9 @@ static ssize_t qeth_l3_dev_route_store(struct qeth_card *card,
 		else if (prot == QETH_PROT_IPV6)
 			rc = qeth_l3_setrouting_v6(card);
 	}
-	return count;
+out:
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static ssize_t qeth_l3_dev_route4_store(struct device *dev,
@@ -157,22 +160,26 @@ static ssize_t qeth_l3_dev_fake_broadcast_store(struct device *dev,
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 	char *tmp;
-	int i;
+	int i, rc = 0;
 
 	if (!card)
 		return -EINVAL;
 
+	mutex_lock(&card->conf_mutex);
 	if ((card->state != CARD_STATE_DOWN) &&
-	    (card->state != CARD_STATE_RECOVER))
-		return -EPERM;
+	    (card->state != CARD_STATE_RECOVER)) {
+		rc = -EPERM;
+		goto out;
+	}
 
 	i = simple_strtoul(buf, &tmp, 16);
 	if ((i == 0) || (i == 1))
 		card->options.fake_broadcast = i;
-	else {
-		return -EINVAL;
-	}
-	return count;
+	else
+		rc = -EINVAL;
+out:
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static DEVICE_ATTR(fake_broadcast, 0644, qeth_l3_dev_fake_broadcast_show,
@@ -200,31 +207,35 @@ static ssize_t qeth_l3_dev_broadcast_mode_store(struct device *dev,
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 	char *tmp;
+	int rc = 0;
 
 	if (!card)
 		return -EINVAL;
 
+	mutex_lock(&card->conf_mutex);
 	if ((card->state != CARD_STATE_DOWN) &&
-	    (card->state != CARD_STATE_RECOVER))
-		return -EPERM;
+	    (card->state != CARD_STATE_RECOVER)) {
+		rc = -EPERM;
+		goto out;
+	}
 
 	if (!((card->info.link_type == QETH_LINK_TYPE_HSTR) ||
 	      (card->info.link_type == QETH_LINK_TYPE_LANE_TR))) {
-		return -EINVAL;
+		rc = -EINVAL;
+		goto out;
 	}
 
 	tmp = strsep((char **) &buf, "\n");
 
-	if (!strcmp(tmp, "local")) {
+	if (!strcmp(tmp, "local"))
 		card->options.broadcast_mode = QETH_TR_BROADCAST_LOCAL;
-		return count;
-	} else if (!strcmp(tmp, "all_rings")) {
+	else if (!strcmp(tmp, "all_rings"))
 		card->options.broadcast_mode = QETH_TR_BROADCAST_ALLRINGS;
-		return count;
-	} else {
-		return -EINVAL;
-	}
-	return count;
+	else
+		rc = -EINVAL;
+out:
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static DEVICE_ATTR(broadcast_mode, 0644, qeth_l3_dev_broadcast_mode_show,
@@ -251,18 +262,22 @@ static ssize_t qeth_l3_dev_canonical_macaddr_store(struct device *dev,
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 	char *tmp;
-	int i;
+	int i, rc = 0;
 
 	if (!card)
 		return -EINVAL;
 
+	mutex_lock(&card->conf_mutex);
 	if ((card->state != CARD_STATE_DOWN) &&
-	    (card->state != CARD_STATE_RECOVER))
-		return -EPERM;
+	    (card->state != CARD_STATE_RECOVER)) {
+		rc = -EPERM;
+		goto out;
+	}
 
 	if (!((card->info.link_type == QETH_LINK_TYPE_HSTR) ||
 	      (card->info.link_type == QETH_LINK_TYPE_LANE_TR))) {
-		return -EINVAL;
+		rc = -EINVAL;
+		goto out;
 	}
 
 	i = simple_strtoul(buf, &tmp, 16);
@@ -270,10 +285,11 @@ static ssize_t qeth_l3_dev_canonical_macaddr_store(struct device *dev,
 		card->options.macaddr_mode = i?
 			QETH_TR_MACADDR_CANONICAL :
 			QETH_TR_MACADDR_NONCANONICAL;
-	else {
-		return -EINVAL;
-	}
-	return count;
+	else
+		rc = -EINVAL;
+out:
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static DEVICE_ATTR(canonical_macaddr, 0644, qeth_l3_dev_canonical_macaddr_show,
@@ -297,11 +313,12 @@ static ssize_t qeth_l3_dev_checksum_store(struct device *dev,
 	struct qeth_card *card = dev_get_drvdata(dev);
 	enum qeth_checksum_types csum_type;
 	char *tmp;
-	int rc;
+	int rc = 0;
 
 	if (!card)
 		return -EINVAL;
 
+	mutex_lock(&card->conf_mutex);
 	tmp = strsep((char **) &buf, "\n");
 	if (!strcmp(tmp, "sw_checksumming"))
 		csum_type = SW_CHECKSUMMING;
@@ -309,13 +326,15 @@ static ssize_t qeth_l3_dev_checksum_store(struct device *dev,
 		csum_type = HW_CHECKSUMMING;
 	else if (!strcmp(tmp, "no_checksumming"))
 		csum_type = NO_CHECKSUMMING;
-	else
-		return -EINVAL;
+	else {
+		rc = -EINVAL;
+		goto out;
+	}
 
 	rc = qeth_l3_set_rx_csum(card, csum_type);
-	if (rc)
-		return rc;
-	return count;
+out:
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static DEVICE_ATTR(checksumming, 0644, qeth_l3_dev_checksum_show,
@@ -336,7 +355,7 @@ static ssize_t qeth_l3_dev_sniffer_store(struct device *dev,
 		struct device_attribute *attr, const char *buf, size_t count)
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
-	int ret;
+	int rc = 0;
 	unsigned long i;
 
 	if (!card)
@@ -345,19 +364,24 @@ static ssize_t qeth_l3_dev_sniffer_store(struct device *dev,
 	if (card->info.type != QETH_CARD_TYPE_IQD)
 		return -EPERM;
 
+	mutex_lock(&card->conf_mutex);
 	if ((card->state != CARD_STATE_DOWN) &&
-	    (card->state != CARD_STATE_RECOVER))
-		return -EPERM;
+	    (card->state != CARD_STATE_RECOVER)) {
+		rc = -EPERM;
+		goto out;
+	}
 
-	ret = strict_strtoul(buf, 16, &i);
-	if (ret)
-		return -EINVAL;
+	rc = strict_strtoul(buf, 16, &i);
+	if (rc) {
+		rc = -EINVAL;
+		goto out;
+	}
 	switch (i) {
 	case 0:
 		card->options.sniffer = i;
 		break;
 	case 1:
-		ret = qdio_get_ssqd_desc(CARD_DDEV(card), &card->ssqd);
+		qdio_get_ssqd_desc(CARD_DDEV(card), &card->ssqd);
 		if (card->ssqd.qdioac2 & QETH_SNIFF_AVAIL) {
 			card->options.sniffer = i;
 			if (card->qdio.init_pool.buf_count !=
@@ -366,11 +390,13 @@ static ssize_t qeth_l3_dev_sniffer_store(struct device *dev,
 					QETH_IN_BUF_COUNT_MAX);
 			break;
 		} else
-			return -EPERM;
+			rc = -EPERM;
 	default:   /* fall through */
-		return -EINVAL;
+		rc = -EINVAL;
 	}
-	return count;
+out:
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static DEVICE_ATTR(sniffer, 0644, qeth_l3_dev_sniffer_show,
@@ -412,12 +438,11 @@ static ssize_t qeth_l3_dev_large_send_store(struct device *dev,
 	else
 		return -EINVAL;
 
-	if (card->options.large_send == type)
-		return count;
-	rc = qeth_l3_set_large_send(card, type);
-	if (rc)
-		return rc;
-	return count;
+	mutex_lock(&card->conf_mutex);
+	if (card->options.large_send != type)
+		rc = qeth_l3_set_large_send(card, type);
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static DEVICE_ATTR(large_send, 0644, qeth_l3_dev_large_send_show,
@@ -455,13 +480,17 @@ static ssize_t qeth_l3_dev_ipato_enable_store(struct device *dev,
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 	char *tmp;
+	int rc = 0;
 
 	if (!card)
 		return -EINVAL;
 
+	mutex_lock(&card->conf_mutex);
 	if ((card->state != CARD_STATE_DOWN) &&
-	    (card->state != CARD_STATE_RECOVER))
-		return -EPERM;
+	    (card->state != CARD_STATE_RECOVER)) {
+		rc = -EPERM;
+		goto out;
+	}
 
 	tmp = strsep((char **) &buf, "\n");
 	if (!strcmp(tmp, "toggle")) {
@@ -470,10 +499,11 @@ static ssize_t qeth_l3_dev_ipato_enable_store(struct device *dev,
 		card->ipato.enabled = 1;
 	} else if (!strcmp(tmp, "0")) {
 		card->ipato.enabled = 0;
-	} else {
-		return -EINVAL;
-	}
-	return count;
+	} else
+		rc = -EINVAL;
+out:
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static QETH_DEVICE_ATTR(ipato_enable, enable, 0644,
@@ -497,10 +527,12 @@ static ssize_t qeth_l3_dev_ipato_invert4_store(struct device *dev,
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 	char *tmp;
+	int rc = 0;
 
 	if (!card)
 		return -EINVAL;
 
+	mutex_lock(&card->conf_mutex);
 	tmp = strsep((char **) &buf, "\n");
 	if (!strcmp(tmp, "toggle")) {
 		card->ipato.invert4 = (card->ipato.invert4)? 0 : 1;
@@ -508,10 +540,10 @@ static ssize_t qeth_l3_dev_ipato_invert4_store(struct device *dev,
 		card->ipato.invert4 = 1;
 	} else if (!strcmp(tmp, "0")) {
 		card->ipato.invert4 = 0;
-	} else {
-		return -EINVAL;
-	}
-	return count;
+	} else
+		rc = -EINVAL;
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static QETH_DEVICE_ATTR(ipato_invert4, invert4, 0644,
@@ -593,27 +625,28 @@ static ssize_t qeth_l3_dev_ipato_add_store(const char *buf, size_t count,
 	struct qeth_ipato_entry *ipatoe;
 	u8 addr[16];
 	int mask_bits;
-	int rc;
+	int rc = 0;
 
+	mutex_lock(&card->conf_mutex);
 	rc = qeth_l3_parse_ipatoe(buf, proto, addr, &mask_bits);
 	if (rc)
-		return rc;
+		goto out;
 
 	ipatoe = kzalloc(sizeof(struct qeth_ipato_entry), GFP_KERNEL);
 	if (!ipatoe) {
-		return -ENOMEM;
+		rc = -ENOMEM;
+		goto out;
 	}
 	ipatoe->proto = proto;
 	memcpy(ipatoe->addr, addr, (proto == QETH_PROT_IPV4)? 4:16);
 	ipatoe->mask_bits = mask_bits;
 
 	rc = qeth_l3_add_ipato_entry(card, ipatoe);
-	if (rc) {
+	if (rc)
 		kfree(ipatoe);
-		return rc;
-	}
-
-	return count;
+out:
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static ssize_t qeth_l3_dev_ipato_add4_store(struct device *dev,
@@ -636,15 +669,14 @@ static ssize_t qeth_l3_dev_ipato_del_store(const char *buf, size_t count,
 {
 	u8 addr[16];
 	int mask_bits;
-	int rc;
+	int rc = 0;
 
+	mutex_lock(&card->conf_mutex);
 	rc = qeth_l3_parse_ipatoe(buf, proto, addr, &mask_bits);
-	if (rc)
-		return rc;
-
-	qeth_l3_del_ipato_entry(card, proto, addr, mask_bits);
-
-	return count;
+	if (!rc)
+		qeth_l3_del_ipato_entry(card, proto, addr, mask_bits);
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static ssize_t qeth_l3_dev_ipato_del4_store(struct device *dev,
@@ -677,10 +709,12 @@ static ssize_t qeth_l3_dev_ipato_invert6_store(struct device *dev,
 {
 	struct qeth_card *card = dev_get_drvdata(dev);
 	char *tmp;
+	int rc = 0;
 
 	if (!card)
 		return -EINVAL;
 
+	mutex_lock(&card->conf_mutex);
 	tmp = strsep((char **) &buf, "\n");
 	if (!strcmp(tmp, "toggle")) {
 		card->ipato.invert6 = (card->ipato.invert6)? 0 : 1;
@@ -688,10 +722,10 @@ static ssize_t qeth_l3_dev_ipato_invert6_store(struct device *dev,
 		card->ipato.invert6 = 1;
 	} else if (!strcmp(tmp, "0")) {
 		card->ipato.invert6 = 0;
-	} else {
-		return -EINVAL;
-	}
-	return count;
+	} else
+		rc = -EINVAL;
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static QETH_DEVICE_ATTR(ipato_invert6, invert6, 0644,
@@ -813,15 +847,12 @@ static ssize_t qeth_l3_dev_vipa_add_store(const char *buf, size_t count,
 	u8 addr[16] = {0, };
 	int rc;
 
+	mutex_lock(&card->conf_mutex);
 	rc = qeth_l3_parse_vipae(buf, proto, addr);
-	if (rc)
-		return rc;
-
-	rc = qeth_l3_add_vipa(card, proto, addr);
-	if (rc)
-		return rc;
-
-	return count;
+	if (!rc)
+		rc = qeth_l3_add_vipa(card, proto, addr);
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static ssize_t qeth_l3_dev_vipa_add4_store(struct device *dev,
@@ -845,13 +876,12 @@ static ssize_t qeth_l3_dev_vipa_del_store(const char *buf, size_t count,
 	u8 addr[16];
 	int rc;
 
+	mutex_lock(&card->conf_mutex);
 	rc = qeth_l3_parse_vipae(buf, proto, addr);
-	if (rc)
-		return rc;
-
-	qeth_l3_del_vipa(card, proto, addr);
-
-	return count;
+	if (!rc)
+		qeth_l3_del_vipa(card, proto, addr);
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static ssize_t qeth_l3_dev_vipa_del4_store(struct device *dev,
@@ -979,15 +1009,12 @@ static ssize_t qeth_l3_dev_rxip_add_store(const char *buf, size_t count,
 	u8 addr[16] = {0, };
 	int rc;
 
+	mutex_lock(&card->conf_mutex);
 	rc = qeth_l3_parse_rxipe(buf, proto, addr);
-	if (rc)
-		return rc;
-
-	rc = qeth_l3_add_rxip(card, proto, addr);
-	if (rc)
-		return rc;
-
-	return count;
+	if (!rc)
+		rc = qeth_l3_add_rxip(card, proto, addr);
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static ssize_t qeth_l3_dev_rxip_add4_store(struct device *dev,
@@ -1011,13 +1038,12 @@ static ssize_t qeth_l3_dev_rxip_del_store(const char *buf, size_t count,
 	u8 addr[16];
 	int rc;
 
+	mutex_lock(&card->conf_mutex);
 	rc = qeth_l3_parse_rxipe(buf, proto, addr);
-	if (rc)
-		return rc;
-
-	qeth_l3_del_rxip(card, proto, addr);
-
-	return count;
+	if (!rc)
+		qeth_l3_del_rxip(card, proto, addr);
+	mutex_unlock(&card->conf_mutex);
+	return rc ? rc : count;
 }
 
 static ssize_t qeth_l3_dev_rxip_del4_store(struct device *dev,