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Revert "IPoIB: Make ipoib_mcast_stop_thread flush the workqueue"

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This reverts commit bb42a6dd02.

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 15:38:46 -08:00
parent a84544a4fe
commit 4e0ab200fa
3 changed files with 15 additions and 12 deletions
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2
drivers/infiniband/ulp/ipoib/ipoib.h
View file

@ -499,7 +499,7 @@ void ipoib_mcast_send(struct net_device *dev, u8 *daddr, struct sk_buff *skb);
void ipoib_mcast_restart_task(struct work_struct *work);
int ipoib_mcast_start_thread(struct net_device *dev);
int ipoib_mcast_stop_thread(struct net_device *dev);
int ipoib_mcast_stop_thread(struct net_device *dev, int flush);
void ipoib_mcast_dev_down(struct net_device *dev);
void ipoib_mcast_dev_flush(struct net_device *dev);

4
drivers/infiniband/ulp/ipoib/ipoib_ib.c
View file

@ -747,7 +747,7 @@ int ipoib_ib_dev_down(struct net_device *dev, int flush)
clear_bit(IPOIB_FLAG_OPER_UP, &priv->flags);
netif_carrier_off(dev);
ipoib_mcast_stop_thread(dev);
ipoib_mcast_stop_thread(dev, flush);
ipoib_mcast_dev_flush(dev);
ipoib_flush_paths(dev);
@ -1097,7 +1097,7 @@ void ipoib_ib_dev_cleanup(struct net_device *dev)
*/
ipoib_flush_paths(dev);
ipoib_mcast_stop_thread(dev);
ipoib_mcast_stop_thread(dev, 1);
ipoib_mcast_dev_flush(dev);
ipoib_transport_dev_cleanup(dev);

21
drivers/infiniband/ulp/ipoib/ipoib_multicast.c
View file

@ -648,7 +648,7 @@ int ipoib_mcast_start_thread(struct net_device *dev)
return 0;
}
int ipoib_mcast_stop_thread(struct net_device *dev)
int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
@ -659,7 +659,8 @@ int ipoib_mcast_stop_thread(struct net_device *dev)
cancel_delayed_work(&priv->mcast_task);
mutex_unlock(&mcast_mutex);
flush_workqueue(priv->wq);
if (flush)
flush_workqueue(priv->wq);
return 0;
}
@ -837,6 +838,8 @@ void ipoib_mcast_restart_task(struct work_struct *work)
ipoib_dbg_mcast(priv, "restarting multicast task\n");
ipoib_mcast_stop_thread(dev, 0);
local_irq_save(flags);
netif_addr_lock(dev);
spin_lock(&priv->lock);
@ -933,10 +936,13 @@ void ipoib_mcast_restart_task(struct work_struct *work)
* We have to cancel outside of the spinlock, but we have to
* take the rtnl lock or else we race with the removal of
* entries from the remove list in mcast_dev_flush as part
* of ipoib_stop(). We detect the drop of the ADMIN_UP flag
* to signal that we have hit this particular race, and we
* return since we know we don't need to do anything else
* anyway.
* of ipoib_stop() which will call mcast_stop_thread with
* flush == 1 while holding the rtnl lock, and the
* flush_workqueue won't complete until this restart_mcast_task
* completes. So do like the carrier on task and attempt to
* take the rtnl lock, but if we can't before the ADMIN_UP flag
* goes away, then just return and know that the remove list will
* get flushed later by mcast_stop_thread.
*/
while (!rtnl_trylock()) {
if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
@ -948,9 +954,6 @@ void ipoib_mcast_restart_task(struct work_struct *work)
ipoib_mcast_leave(mcast->dev, mcast);
ipoib_mcast_free(mcast);
}
/*
* Restart our join task if needed
*/
ipoib_mcast_start_thread(dev);
rtnl_unlock();
}