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IB/ipoib: Consolidate rtnl_lock tasks in workqueue
The ipoib_mcast_flush_dev routine is called with the rtnl_lock held and needs to keep it held. It also needs to call flush_workqueue() to flush out any outstanding work. In the past, we've had to try and make sure that we didn't flush out any outstanding join completions because they also wanted to grab rtnl_lock() and that would deadlock. It turns out that the only thing in the join completion handler that needs this lock can be safely moved to our carrier_on_task, thereby reducing the potential for the join completion code and the flush code to deadlock against each other. Signed-off-by: Doug Ledford <dledford@redhat.com>
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1 changed files with 2 additions and 6 deletions
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@ -190,12 +190,6 @@ static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
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spin_unlock_irq(&priv->lock);
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priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
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set_qkey = 1;
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if (!ipoib_cm_admin_enabled(dev)) {
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rtnl_lock();
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dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
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rtnl_unlock();
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}
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}
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if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
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@ -371,6 +365,8 @@ void ipoib_mcast_carrier_on_task(struct work_struct *work)
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}
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rtnl_lock();
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if (!ipoib_cm_admin_enabled(priv->dev))
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dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
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netif_carrier_on(priv->dev);
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rtnl_unlock();
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}
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