Commit 1360f430 authored by Shamir Rabinovitch's avatar Shamir Rabinovitch Committed by Greg Kroah-Hartman

IB/IPoIB: ibX: failed to create mcg debug file

commit 771a5258 upstream.

When udev renames the netdev devices, ipoib debugfs entries does not
get renamed. As a result, if subsequent probe of ipoib device reuse the
name then creating a debugfs entry for the new device would fail.

Also, moved ipoib_create_debug_files and ipoib_delete_debug_files as part
of ipoib event handling in order to avoid any race condition between these.

Fixes: 1732b0ef ([IPoIB] add path record information in debugfs)
Signed-off-by: default avatarVijay Kumar <vijay.ac.kumar@oracle.com>
Signed-off-by: default avatarShamir Rabinovitch <shamir.rabinovitch@oracle.com>
Reviewed-by: default avatarMark Bloch <markb@mellanox.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1549c883
......@@ -281,8 +281,11 @@ void ipoib_delete_debug_files(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
WARN_ONCE(!priv->mcg_dentry, "null mcg debug file\n");
WARN_ONCE(!priv->path_dentry, "null path debug file\n");
debugfs_remove(priv->mcg_dentry);
debugfs_remove(priv->path_dentry);
priv->mcg_dentry = priv->path_dentry = NULL;
}
int ipoib_register_debugfs(void)
......
......@@ -106,6 +106,33 @@ static struct ib_client ipoib_client = {
.get_net_dev_by_params = ipoib_get_net_dev_by_params,
};
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
static int ipoib_netdev_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct netdev_notifier_info *ni = ptr;
struct net_device *dev = ni->dev;
if (dev->netdev_ops->ndo_open != ipoib_open)
return NOTIFY_DONE;
switch (event) {
case NETDEV_REGISTER:
ipoib_create_debug_files(dev);
break;
case NETDEV_CHANGENAME:
ipoib_delete_debug_files(dev);
ipoib_create_debug_files(dev);
break;
case NETDEV_UNREGISTER:
ipoib_delete_debug_files(dev);
break;
}
return NOTIFY_DONE;
}
#endif
int ipoib_open(struct net_device *dev)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
......@@ -1595,8 +1622,6 @@ void ipoib_dev_cleanup(struct net_device *dev)
ASSERT_RTNL();
ipoib_delete_debug_files(dev);
/* Delete any child interfaces first */
list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs, list) {
/* Stop GC on child */
......@@ -1908,8 +1933,6 @@ static struct net_device *ipoib_add_port(const char *format,
goto register_failed;
}
ipoib_create_debug_files(priv->dev);
if (ipoib_cm_add_mode_attr(priv->dev))
goto sysfs_failed;
if (ipoib_add_pkey_attr(priv->dev))
......@@ -1924,7 +1947,6 @@ static struct net_device *ipoib_add_port(const char *format,
return priv->dev;
sysfs_failed:
ipoib_delete_debug_files(priv->dev);
unregister_netdev(priv->dev);
register_failed:
......@@ -2006,6 +2028,12 @@ static void ipoib_remove_one(struct ib_device *device, void *client_data)
kfree(dev_list);
}
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
static struct notifier_block ipoib_netdev_notifier = {
.notifier_call = ipoib_netdev_event,
};
#endif
static int __init ipoib_init_module(void)
{
int ret;
......@@ -2057,6 +2085,9 @@ static int __init ipoib_init_module(void)
if (ret)
goto err_client;
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
register_netdevice_notifier(&ipoib_netdev_notifier);
#endif
return 0;
err_client:
......@@ -2074,6 +2105,9 @@ static int __init ipoib_init_module(void)
static void __exit ipoib_cleanup_module(void)
{
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
unregister_netdevice_notifier(&ipoib_netdev_notifier);
#endif
ipoib_netlink_fini();
ib_unregister_client(&ipoib_client);
ib_sa_unregister_client(&ipoib_sa_client);
......
......@@ -85,8 +85,6 @@ int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
goto register_failed;
}
ipoib_create_debug_files(priv->dev);
/* RTNL childs don't need proprietary sysfs entries */
if (type == IPOIB_LEGACY_CHILD) {
if (ipoib_cm_add_mode_attr(priv->dev))
......@@ -107,7 +105,6 @@ int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
sysfs_failed:
result = -ENOMEM;
ipoib_delete_debug_files(priv->dev);
unregister_netdevice(priv->dev);
register_failed:
......
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