We will protect net->mpls.platform_label by a dedicated mutex. Then, we need to wrap functions called from mpls_dev_notify() with the mutex. As a prep, let's unify the return paths. Signed-off-by: Kuniyuki Iwashima --- net/mpls/af_mpls.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index e7be87466809..c5bbf712f8be 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -1616,22 +1616,24 @@ static int mpls_dev_notify(struct notifier_block *this, unsigned long event, if (event == NETDEV_REGISTER) { mdev = mpls_add_dev(dev); - if (IS_ERR(mdev)) - return notifier_from_errno(PTR_ERR(mdev)); + if (IS_ERR(mdev)) { + err = PTR_ERR(mdev); + goto err; + } - return NOTIFY_OK; + goto out; } mdev = mpls_dev_get(dev); if (!mdev) - return NOTIFY_OK; + goto out; switch (event) { case NETDEV_DOWN: err = mpls_ifdown(dev, event); if (err) - return notifier_from_errno(err); + goto err; break; case NETDEV_UP: flags = netif_get_flags(dev); @@ -1647,13 +1649,14 @@ static int mpls_dev_notify(struct notifier_block *this, unsigned long event, } else { err = mpls_ifdown(dev, event); if (err) - return notifier_from_errno(err); + goto err; } break; case NETDEV_UNREGISTER: err = mpls_ifdown(dev, event); if (err) - return notifier_from_errno(err); + goto err; + mdev = mpls_dev_get(dev); if (mdev) { mpls_dev_sysctl_unregister(dev, mdev); @@ -1667,11 +1670,16 @@ static int mpls_dev_notify(struct notifier_block *this, unsigned long event, mpls_dev_sysctl_unregister(dev, mdev); err = mpls_dev_sysctl_register(dev, mdev); if (err) - return notifier_from_errno(err); + goto err; } break; } + +out: return NOTIFY_OK; + +err: + return notifier_from_errno(err); } static struct notifier_block mpls_dev_notifier = { -- 2.51.1.851.g4ebd6896fd-goog