diff options
| author |   Jason Gunthorpe <jgg@mellanox.com> | 2018-07-29 11:34:59 +0300 |
|---|---|---|
| committer | Jason Gunthorpe <jgg@mellanox.com> | 2018-08-02 20:27:44 -0600 |
| commit | 13476d35bba60b59521ff25d902fdb552b8bf2ac (patch) | |
| tree | a6064d13b53ae0cd8cc5ad8f7672244918fbfdff /drivers/infiniband/ulp/ipoib/ipoib_main.c | |
| parent | IB/ipoib: Do not remove child devices from within the ndo_uninit (diff) | |
| download | linux-dev-13476d35bba60b59521ff25d902fdb552b8bf2ac.tar.xz linux-dev-13476d35bba60b59521ff25d902fdb552b8bf2ac.zip | |
IB/ipoib: Maintain the child_intfs list from ndo_init/uninit
This fixes a bug in the netlink path where the vlan_rwsem was not
held around __ipoib_vlan_add causing the child_intfs to be manipulated
unsafely.
In the process this greatly simplifies the vlan_rwsem write side locking
to only cover a single non-sleeping statement.
This also further increases the safety of the removal ordering by holding
the netdev of the parent while the child is active to ensure most bugs
become either an oops on a NULL priv or a deadlock on the netdev refcount.
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Diffstat (limited to 'drivers/infiniband/ulp/ipoib/ipoib_main.c')
| -rw-r--r-- | drivers/infiniband/ulp/ipoib/ipoib_main.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c index b2fe23d60103..e3d28f9ad9c0 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c @@ -1890,6 +1890,12 @@ static void ipoib_child_init(struct net_device *ndev) struct ipoib_dev_priv *priv = ipoib_priv(ndev); struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); + dev_hold(priv->parent); + + down_write(&ppriv->vlan_rwsem); + list_add_tail(&priv->list, &ppriv->child_intfs); + up_write(&ppriv->vlan_rwsem); + priv->max_ib_mtu = ppriv->max_ib_mtu; set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags); memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN); @@ -1959,6 +1965,16 @@ static void ipoib_ndo_uninit(struct net_device *dev) destroy_workqueue(priv->wq); priv->wq = NULL; } + + if (priv->parent) { + struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent); + + down_write(&ppriv->vlan_rwsem); + list_del(&priv->list); + up_write(&ppriv->vlan_rwsem); + + dev_put(priv->parent); + } } static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state) |