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Revert "IPoIB: Make the carrier_on_task race aware"

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This reverts commit 67d7209e1f.

The series of IPoIB bug fixes that went into 3.19-rc1 introduce
regressions, and after trying to sort things out, we decided to revert
to 3.18's IPoIB driver and get things right for 3.20.

Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Roland Dreier 2015-01-30 15:39:29 -08:00
parent e7a623d2df
commit c6a7ec7a0f
1 changed files with 6 additions and 15 deletions
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21
drivers/infiniband/ulp/ipoib/ipoib_multicast.c
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@ -353,27 +353,18 @@ void ipoib_mcast_carrier_on_task(struct work_struct *work)
carrier_on_task); carrier_on_task);
struct ib_port_attr attr; struct ib_port_attr attr;
/*
* Take rtnl_lock to avoid racing with ipoib_stop() and
* turning the carrier back on while a device is being
* removed.
*/
if (ib_query_port(priv->ca, priv->port, &attr) || if (ib_query_port(priv->ca, priv->port, &attr) ||
attr.state != IB_PORT_ACTIVE) { attr.state != IB_PORT_ACTIVE) {
ipoib_dbg(priv, "Keeping carrier off until IB port is active\n"); ipoib_dbg(priv, "Keeping carrier off until IB port is active\n");
return; return;
} }
/* rtnl_lock();
* Take rtnl_lock to avoid racing with ipoib_stop() and
* turning the carrier back on while a device is being
* removed. However, ipoib_stop() will attempt to flush
* the workqueue while holding the rtnl lock, so loop
* on trylock until either we get the lock or we see
* FLAG_ADMIN_UP go away as that signals that we are bailing
* and can safely ignore the carrier on work
*/
while (!rtnl_trylock()) {
if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
return;
else
msleep(20);
}
if (!ipoib_cm_admin_enabled(priv->dev)) if (!ipoib_cm_admin_enabled(priv->dev))
dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu)); dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
netif_carrier_on(priv->dev); netif_carrier_on(priv->dev);