This is a note to let you know that I've just added the patch titled
IB/IPoIB: ibX: failed to create mcg debug file
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ib-ipoib-ibx-failed-to-create-mcg-debug-file.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 771a52584096c45e4565e8aabb596eece9d73d61 Mon Sep 17 00:00:00 2001
From: Shamir Rabinovitch <shamir.rabinovitch@xxxxxxxxxx>
Date: Wed, 29 Mar 2017 06:21:59 -0400
Subject: IB/IPoIB: ibX: failed to create mcg debug file
From: Shamir Rabinovitch <shamir.rabinovitch@xxxxxxxxxx>
commit 771a52584096c45e4565e8aabb596eece9d73d61 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: 1732b0ef3b3a ([IPoIB] add path record information in debugfs)
Signed-off-by: Vijay Kumar <vijay.ac.kumar@xxxxxxxxxx>
Signed-off-by: Shamir Rabinovitch <shamir.rabinovitch@xxxxxxxxxx>
Reviewed-by: Mark Bloch <markb@xxxxxxxxxxxx>
Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/ulp/ipoib/ipoib_fs.c | 3 ++
drivers/infiniband/ulp/ipoib/ipoib_main.c | 44 ++++++++++++++++++++++++++----
drivers/infiniband/ulp/ipoib/ipoib_vlan.c | 3 --
3 files changed, 42 insertions(+), 8 deletions(-)
--- a/drivers/infiniband/ulp/ipoib/ipoib_fs.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_fs.c
@@ -281,8 +281,11 @@ void ipoib_delete_debug_files(struct net
{
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)
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -108,6 +108,33 @@ 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);
@@ -1655,8 +1682,6 @@ void ipoib_dev_cleanup(struct net_device
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 */
@@ -2074,8 +2099,6 @@ static struct net_device *ipoib_add_port
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))
@@ -2090,7 +2113,6 @@ static struct net_device *ipoib_add_port
return priv->dev;
sysfs_failed:
- ipoib_delete_debug_files(priv->dev);
unregister_netdev(priv->dev);
register_failed:
@@ -2175,6 +2197,12 @@ static void ipoib_remove_one(struct ib_d
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;
@@ -2227,6 +2255,9 @@ 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:
@@ -2244,6 +2275,9 @@ err_fs:
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);
--- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -87,8 +87,6 @@ int __ipoib_vlan_add(struct ipoib_dev_pr
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))
@@ -109,7 +107,6 @@ int __ipoib_vlan_add(struct ipoib_dev_pr
sysfs_failed:
result = -ENOMEM;
- ipoib_delete_debug_files(priv->dev);
unregister_netdevice(priv->dev);
register_failed:
Patches currently in stable-queue which might be from shamir.rabinovitch@xxxxxxxxxx are
queue-4.9/ib-ipoib-ibx-failed-to-create-mcg-debug-file.patch