IB/IPoIB: Fix race between ipoib_remove_one to sysfs functions

commit 198b12f77084244d310888dd5d643083cb5c2aa1 upstream.

In ipoib_remove_one the driver holds the rtnl_lock and tries to do some
operation like dev_change_flags or unregister_netdev, while sysfs
callback like ipoib_vlan_delete holds sysfs mutex and tries to hold the
rtnl_lock via rtnl_trylock() and restart_syscall() if the lock is not
free, meanwhile ipoib_remove_one tries to get the sysfs lock in order to
free its sysfs directory, and we will get  a->b, b->a deadlock.

    Trace like the following:

        schedule+0x37/0x80
        schedule_preempt_disabled+0xe/0x10
        __mutex_lock_slowpath+0xb5/0x120
        mutex_lock+0x23/0x40
        rtnl_lock+0x15/0x20
        netdev_run_todo+0x17c/0x320
        rtnl_unlock+0xe/0x10
        ipoib_vlan_delete+0x11b/0x1b0 [ib_ipoib]
        delete_child+0x54/0x80 [ib_ipoib]
        dev_attr_store+0x18/0x30
        sysfs_kf_write+0x37/0x40
        mutex_lock+0x16/0x40
        SyS_write+0x55/0xc0
        entry_SYSCALL_64_fastpath+0x16/0x75
    And
        schedule+0x37/0x80
        __kernfs_remove+0x1a8/0x260
        ? wake_atomic_t_function+0x60/0x60
        kernfs_remove+0x25/0x40
        sysfs_remove_dir+0x50/0x80
        kobject_del+0x18/0x50
        device_del+0x19f/0x260
        netdev_unregister_kobject+0x6a/0x80
        rollback_registered_many+0x1fd/0x340
        rollback_registered+0x3c/0x70
        unregister_netdevice_queue+0x55/0xc0
        unregister_netdev+0x20/0x30
        ipoib_remove_one+0x114/0x1b0 [ib_ipoib]
        ib_unregister_client+0x4a/0x170 [ib_core]
        ? find_module_all+0x71/0xa0
        ipoib_cleanup_module+0x10/0x94 [ib_ipoib]
        SyS_delete_module+0x1b5/0x210
        entry_SYSCALL_64_fastpath+0x16/0x75

The fix is by checking the flag IPOIB_FLAG_INTF_ON_DESTROY in order to
get out from the sysfs function.

Fixes: 862096a8bbf8 ("IB/ipoib: Add more rtnl_link_ops callbacks")
Fixes: 9baa0b036410 ("IB/ipoib: Add rtnl_link_ops support")
Signed-off-by: Erez Shitrit <erezsh@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h
index c639f90cfda41709ce77c4051b8ed8086f4dd700..2a7c7dc28726e28c011baaabb16d09c0698dc2ad 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib.h
+++ b/drivers/infiniband/ulp/ipoib/ipoib.h
@@ -94,6 +94,7 @@ enum {
        IPOIB_FLAG_UMCAST         = 10,
        IPOIB_STOP_NEIGH_GC       = 11,
        IPOIB_NEIGH_TBL_FLUSH     = 12,
+       IPOIB_FLAG_GOING_DOWN     = 15,
 
        IPOIB_MAX_BACKOFF_SECONDS = 16,
 

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_cm.c b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
index 933efcea0d03f11b4da3967b8eedc137da21e08a..105eebd77ad4fa32236acff899d2d70c17e16c63 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_cm.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_cm.c
@@ -1472,6 +1472,10 @@ static ssize_t set_mode(struct device *d, struct device_attribute *attr,
 {
        struct net_device *dev = to_net_dev(d);
        int ret;
+       struct ipoib_dev_priv *priv = netdev_priv(dev);
+
+       if (test_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags))
+               return -EPERM;
 
        if (!rtnl_trylock())
                return restart_syscall();

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 5786a78ff8bc97811612818ab08f1fd8c3a01132..9de3f9d054df116ea40c7bc71139b1eb40e6bfdf 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1701,6 +1701,9 @@ static void ipoib_remove_one(struct ib_device *device)
        list_for_each_entry_safe(priv, tmp, dev_list, list) {
                ib_unregister_event_handler(&priv->event_handler);
 
+               /* mark interface in the middle of destruction */
+               set_bit(IPOIB_FLAG_GOING_DOWN, &priv->flags);
+
                rtnl_lock();
                dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP);
                rtnl_unlock();

diff --git a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
index 9fad7b5ac8b91910af7e6b1527f20165323e7dc8..91da685cdafd49ddd6e4771d6a6c963a1fc31c80 100644 (file)
--- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -131,6 +131,9 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
 
        ppriv = netdev_priv(pdev);
 
+       if (test_bit(IPOIB_FLAG_GOING_DOWN, &ppriv->flags))
+               return -EPERM;
+
        snprintf(intf_name, sizeof intf_name, "%s.%04x",
                 ppriv->dev->name, pkey);
        priv = ipoib_intf_alloc(intf_name);
@@ -183,6 +186,9 @@ int ipoib_vlan_delete(struct net_device *pdev, unsigned short pkey)
 
        ppriv = netdev_priv(pdev);
 
+       if (test_bit(IPOIB_FLAG_GOING_DOWN, &ppriv->flags))
+               return -EPERM;
+
        if (!rtnl_trylock())
                return restart_syscall();