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Commit 16a83b30 authored by Frank Pavlic's avatar Frank Pavlic Committed by Jeff Garzik
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[PATCH] s390: netiucv driver fixes 



[PATCH 2/9] s390: netiucv driver fixes

From: Frank Pavlic <fpavlic@de.ibm.com>
	- missing lock initialization added
        - avoid duplicate iucv-interfaces to the same peer
       	- rw-lock added for manipulating the list of
          defined iucv connections

Signed-off-by: default avatarFrank Pavlic <fpavlic@de.ibm.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 4c7ae6ea

drivers/s390/net/netiucv.c

+64 −16
Original line number Diff line number Diff line
@@ -112,7 +112,12 @@ struct iucv_connection { 
/**

 * Linked list of all connection structs.

 */

static struct iucv_connection *iucv_connections;

struct iucv_connection_struct {

	struct iucv_connection *iucv_connections;

	rwlock_t iucv_rwlock;

};



static struct iucv_connection_struct iucv_conns;



/**

 * Representation of event-data for the
@@ -1368,8 +1373,10 @@ user_write (struct device *dev, struct device_attribute *attr, const char *buf, 
	struct net_device *ndev = priv->conn->netdev;

	char    *p;

	char    *tmp;

	char 	username[10];

	char 	username[9];

	int 	i;

	struct iucv_connection **clist = &iucv_conns.iucv_connections;

	unsigned long flags;



	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);

	if (count>9) {
@@ -1382,7 +1389,7 @@ user_write (struct device *dev, struct device_attribute *attr, const char *buf, 
	tmp = strsep((char **) &buf, "\n");

	for (i=0, p=tmp; i<8 && *p; i++, p++) {

		if (isalnum(*p) || (*p == '$'))

			username[i]= *p;

			username[i]= toupper(*p);

		else if (*p == '\n') {

			/* trailing lf, grr */

			break;
@@ -1395,11 +1402,11 @@ user_write (struct device *dev, struct device_attribute *attr, const char *buf, 
			return -EINVAL;

		}

	}

	while (i<9)

	while (i<8)

		username[i++] = ' ';

	username[9] = '\0';

	username[8] = '\0';



	if (memcmp(username, priv->conn->userid, 8)) {

	if (memcmp(username, priv->conn->userid, 9)) {

		/* username changed */

		if (ndev->flags & (IFF_UP | IFF_RUNNING)) {

			PRINT_WARN(
@@ -1410,6 +1417,19 @@ user_write (struct device *dev, struct device_attribute *attr, const char *buf, 
			return -EBUSY;

		}

	}

	read_lock_irqsave(&iucv_conns.iucv_rwlock, flags);

	while (*clist) {

                if (!strncmp(username, (*clist)->userid, 9) ||

		    ((*clist)->netdev != ndev))

                        break;

                clist = &((*clist)->next);

        }

	read_unlock_irqrestore(&iucv_conns.iucv_rwlock, flags);

        if (*clist) {

                PRINT_WARN("netiucv: Connection to %s already exists\n",

                        username);

                return -EEXIST;

        }

	memcpy(priv->conn->userid, username, 9);



	return count;
@@ -1781,13 +1801,15 @@ netiucv_unregister_device(struct device *dev) 
static struct iucv_connection *

netiucv_new_connection(struct net_device *dev, char *username)

{

	struct iucv_connection **clist = &iucv_connections;

	unsigned long flags;

	struct iucv_connection **clist = &iucv_conns.iucv_connections;

	struct iucv_connection *conn =

		kzalloc(sizeof(struct iucv_connection), GFP_KERNEL);



	if (conn) {

		skb_queue_head_init(&conn->collect_queue);

		skb_queue_head_init(&conn->commit_queue);

		spin_lock_init(&conn->collect_lock);

		conn->max_buffsize = NETIUCV_BUFSIZE_DEFAULT;

		conn->netdev = dev;
@@ -1822,8 +1844,10 @@ netiucv_new_connection(struct net_device *dev, char *username) 
			fsm_newstate(conn->fsm, CONN_STATE_STOPPED);

		}



		write_lock_irqsave(&iucv_conns.iucv_rwlock, flags);

		conn->next = *clist;

		*clist = conn;

		write_unlock_irqrestore(&iucv_conns.iucv_rwlock, flags);

	}

	return conn;

}
@@ -1835,14 +1859,17 @@ netiucv_new_connection(struct net_device *dev, char *username) 
static void

netiucv_remove_connection(struct iucv_connection *conn)

{

	struct iucv_connection **clist = &iucv_connections;

	struct iucv_connection **clist = &iucv_conns.iucv_connections;

	unsigned long flags;



	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);

	if (conn == NULL)

		return;

	write_lock_irqsave(&iucv_conns.iucv_rwlock, flags);

	while (*clist) {

		if (*clist == conn) {

			*clist = conn->next;

			write_unlock_irqrestore(&iucv_conns.iucv_rwlock, flags);

			if (conn->handle) {

				iucv_unregister_program(conn->handle);

				conn->handle = NULL;
@@ -1855,6 +1882,7 @@ netiucv_remove_connection(struct iucv_connection *conn) 
		}

		clist = &((*clist)->next);

	}

	write_unlock_irqrestore(&iucv_conns.iucv_rwlock, flags);

}



/**
@@ -1947,9 +1975,11 @@ static ssize_t 
conn_write(struct device_driver *drv, const char *buf, size_t count)

{

	char *p;

	char username[10];

	char username[9];

	int i, ret;

	struct net_device *dev;

	struct iucv_connection **clist = &iucv_conns.iucv_connections;

	unsigned long flags;



	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);

	if (count>9) {
@@ -1960,7 +1990,7 @@ conn_write(struct device_driver *drv, const char *buf, size_t count) 


	for (i=0, p=(char *)buf; i<8 && *p; i++, p++) {

		if (isalnum(*p) || (*p == '$'))

			username[i]= *p;

			username[i]= toupper(*p);

		else if (*p == '\n') {

			/* trailing lf, grr */

			break;
@@ -1971,9 +2001,22 @@ conn_write(struct device_driver *drv, const char *buf, size_t count) 
			return -EINVAL;

		}

	}

	while (i<9)

	while (i<8)

		username[i++] = ' ';

	username[9] = '\0';

	username[8] = '\0';



	read_lock_irqsave(&iucv_conns.iucv_rwlock, flags);

	while (*clist) {

		if (!strncmp(username, (*clist)->userid, 9))

			break;

		clist = &((*clist)->next);

	}

	read_unlock_irqrestore(&iucv_conns.iucv_rwlock, flags);

	if (*clist) {

		PRINT_WARN("netiucv: Connection to %s already exists\n",

			username);

		return -EEXIST;

	}

	dev = netiucv_init_netdevice(username);

	if (!dev) {

		PRINT_WARN(
@@ -2015,7 +2058,8 @@ DRIVER_ATTR(connection, 0200, NULL, conn_write); 
static ssize_t

remove_write (struct device_driver *drv, const char *buf, size_t count)

{

	struct iucv_connection **clist = &iucv_connections;

	struct iucv_connection **clist = &iucv_conns.iucv_connections;

	unsigned long flags;

        struct net_device *ndev;

        struct netiucv_priv *priv;

        struct device *dev;
@@ -2026,7 +2070,7 @@ remove_write (struct device_driver *drv, const char *buf, size_t count) 
        IUCV_DBF_TEXT(trace, 3, __FUNCTION__);



        if (count >= IFNAMSIZ)

                count = IFNAMSIZ-1;

                count = IFNAMSIZ - 1;;



        for (i=0, p=(char *)buf; i<count && *p; i++, p++) {

                if ((*p == '\n') || (*p == ' ')) {
@@ -2038,6 +2082,7 @@ remove_write (struct device_driver *drv, const char *buf, size_t count) 
        }

        name[i] = '\0';



	read_lock_irqsave(&iucv_conns.iucv_rwlock, flags);

        while (*clist) {

                ndev = (*clist)->netdev;

                priv = (struct netiucv_priv*)ndev->priv;
@@ -2047,6 +2092,7 @@ remove_write (struct device_driver *drv, const char *buf, size_t count) 
                        clist = &((*clist)->next);

                        continue;

                }

		read_unlock_irqrestore(&iucv_conns.iucv_rwlock, flags);

                if (ndev->flags & (IFF_UP | IFF_RUNNING)) {

                        PRINT_WARN(

                                "netiucv: net device %s active with peer %s\n",
@@ -2060,6 +2106,7 @@ remove_write (struct device_driver *drv, const char *buf, size_t count) 
                netiucv_unregister_device(dev);

                return count;

        }

	read_unlock_irqrestore(&iucv_conns.iucv_rwlock, flags);

        PRINT_WARN("netiucv: net device %s unknown\n", name);

	IUCV_DBF_TEXT(data, 2, "remove_write: unknown device\n");

        return -EINVAL;
@@ -2077,8 +2124,8 @@ static void __exit 
netiucv_exit(void)

{

	IUCV_DBF_TEXT(trace, 3, __FUNCTION__);

	while (iucv_connections) {

		struct net_device *ndev = iucv_connections->netdev;

	while (iucv_conns.iucv_connections) {

		struct net_device *ndev = iucv_conns.iucv_connections->netdev;

		struct netiucv_priv *priv = (struct netiucv_priv*)ndev->priv;

		struct device *dev = priv->dev;
@@ -2120,6 +2167,7 @@ netiucv_init(void) 
	if (!ret) {

		ret = driver_create_file(&netiucv_driver, &driver_attr_remove);

		netiucv_banner();

		rwlock_init(&iucv_conns.iucv_rwlock);

	} else {

		PRINT_ERR("NETIUCV: failed to add driver attribute.\n");

		IUCV_DBF_TEXT_(setup, 2, "ret %d from driver_create_file\n", ret);