From bb42a6dd02fb2901a69dbec2358810735b14b186 Mon Sep 17 00:00:00 2001 From: Doug Ledford Date: Wed, 10 Dec 2014 11:47:04 -0500 Subject: [PATCH] IPoIB: Make ipoib_mcast_stop_thread flush the workqueue We used to pass a flush variable to mcast_stop_thread to indicate if we should flush the workqueue or not. This was due to some code trying to flush a workqueue that it was currently running on which is a no-no. Now that we have per-device work queues, and now that ipoib_mcast_restart_task has taken the fact that it is queued on a single thread workqueue with all of the ipoib_mcast_join_task's and therefore has no need to stop the join task while it runs, we can do away with the flush parameter and unilaterally flush always. Signed-off-by: Doug Ledford Signed-off-by: Roland Dreier --- drivers/infiniband/ulp/ipoib/ipoib.h | 2 +- drivers/infiniband/ulp/ipoib/ipoib_ib.c | 4 ++-- drivers/infiniband/ulp/ipoib/ipoib_multicast.c | 21 +++++++++------------ 3 files changed, 12 insertions(+), 15 deletions(-) diff --git a/drivers/infiniband/ulp/ipoib/ipoib.h b/drivers/infiniband/ulp/ipoib/ipoib.h index 45fd10a..28dc927 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib.h +++ b/drivers/infiniband/ulp/ipoib/ipoib.h @@ -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 flush); +int ipoib_mcast_stop_thread(struct net_device *dev); void ipoib_mcast_dev_down(struct net_device *dev); void ipoib_mcast_dev_flush(struct net_device *dev); diff --git a/drivers/infiniband/ulp/ipoib/ipoib_ib.c b/drivers/infiniband/ulp/ipoib/ipoib_ib.c index bfd17d4..6609678 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_ib.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_ib.c @@ -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, flush); + ipoib_mcast_stop_thread(dev); 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, 1); + ipoib_mcast_stop_thread(dev); ipoib_mcast_dev_flush(dev); ipoib_transport_dev_cleanup(dev); diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c index 845f910..bc50dd0 100644 --- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c +++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c @@ -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 flush) +int ipoib_mcast_stop_thread(struct net_device *dev) { struct ipoib_dev_priv *priv = netdev_priv(dev); @@ -659,8 +659,7 @@ int ipoib_mcast_stop_thread(struct net_device *dev, int flush) cancel_delayed_work(&priv->mcast_task); mutex_unlock(&mcast_mutex); - if (flush) - flush_workqueue(priv->wq); + flush_workqueue(priv->wq); return 0; } @@ -838,8 +837,6 @@ 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); @@ -936,13 +933,10 @@ 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() 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. + * 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. */ while (!rtnl_trylock()) { if (!test_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags)) @@ -954,6 +948,9 @@ 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(); } -- 2.7.4