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Revert "IPoIB: fix mcast_dev_flush/mcast_restart_task race" 

This reverts commit e5d1dcf1b0.

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 15:39:11 -08:00
parent bb75963414
commit 962121b4fc
1 changed files with 5 additions and 32 deletions
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37
drivers/infiniband/ulp/ipoib/ipoib_multicast.c
View File

@ -802,10 +802,7 @@ void ipoib_mcast_dev_flush(struct net_device *dev)
spin_unlock_irqrestore(&priv->lock, flags);
/*
* make sure the in-flight joins have finished before we attempt
* to leave
*/
/* seperate between the wait to the leave*/
list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
wait_for_completion(&mcast->done);
@ -926,38 +923,14 @@ void ipoib_mcast_restart_task(struct work_struct *work)
netif_addr_unlock(dev);
local_irq_restore(flags);
/*
* make sure the in-flight joins have finished before we attempt
* to leave
*/
list_for_each_entry_safe(mcast, tmcast, &remove_list, list)
if (test_bit(IPOIB_MCAST_FLAG_BUSY, &mcast->flags))
wait_for_completion(&mcast->done);
/*
* 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() 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_dev_flush.
*/
while (!rtnl_trylock()) {
if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
return;
else
msleep(20);
}
/* We have to cancel outside of the spinlock */
list_for_each_entry_safe(mcast, tmcast, &remove_list, list) {
ipoib_mcast_leave(mcast->dev, mcast);
ipoib_mcast_free(mcast);
}
ipoib_mcast_start_thread(dev);
rtnl_unlock();
if (test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags))
ipoib_mcast_start_thread(dev);
}
#ifdef CONFIG_INFINIBAND_IPOIB_DEBUG