netdev - [PATCH net-next v2 4/4] net: inline rollback_registered

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Date:   Tue, 19 Jan 2021 12:25:21 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>
Subject: [PATCH net-next v2 4/4] net: inline rollback_registered_many()

Similar to the change for rollback_registered() -
rollback_registered_many() was a part of unregister_netdevice_many()
minus the net_set_todo(), which is no longer needed.

Functionally this patch moves the list_empty() check back after:

	BUG_ON(dev_boot_phase);
	ASSERT_RTNL();

but I can't find any reason why that would be an issue.

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
---
 net/core/dev.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index a7841d03c910..dee6488f8a31 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5709,7 +5709,7 @@ static void flush_all_backlogs(void)
 	}
 
 	/* we can have in flight packet[s] on the cpus we are not flushing,
-	 * synchronize_net() in rollback_registered_many() will take care of
+	 * synchronize_net() in unregister_netdevice_many() will take care of
 	 * them
 	 */
 	for_each_cpu(cpu, &flush_cpus)
@@ -10605,8 +10605,6 @@ void synchronize_net(void)
 }
 EXPORT_SYMBOL(synchronize_net);
 
-static void rollback_registered_many(struct list_head *head);
-
 /**
  *	unregister_netdevice_queue - remove device from the kernel
  *	@dev: device
@@ -10630,8 +10628,7 @@ void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
 		LIST_HEAD(single);
 
 		list_add(&dev->unreg_list, &single);
-		rollback_registered_many(&single);
-		list_del(&single);
+		unregister_netdevice_many(&single);
 	}
 }
 EXPORT_SYMBOL(unregister_netdevice_queue);
@@ -10644,15 +10641,6 @@ EXPORT_SYMBOL(unregister_netdevice_queue);
  *  we force a list_del() to make sure stack wont be corrupted later.
  */
 void unregister_netdevice_many(struct list_head *head)
-{
-	if (!list_empty(head)) {
-		rollback_registered_many(head);
-		list_del(head);
-	}
-}
-EXPORT_SYMBOL(unregister_netdevice_many);
-
-static void rollback_registered_many(struct list_head *head)
 {
 	struct net_device *dev, *tmp;
 	LIST_HEAD(close_head);
@@ -10660,6 +10648,9 @@ static void rollback_registered_many(struct list_head *head)
 	BUG_ON(dev_boot_phase);
 	ASSERT_RTNL();
 
+	if (list_empty(head))
+		return;
+
 	list_for_each_entry_safe(dev, tmp, head, unreg_list) {
 		/* Some devices call without registering
 		 * for initialization unwind. Remove those
@@ -10743,7 +10734,10 @@ static void rollback_registered_many(struct list_head *head)
 		dev_put(dev);
 		net_set_todo(dev);
 	}
+
+	list_del(head);
 }
+EXPORT_SYMBOL(unregister_netdevice_many);
 
 /**
  *	unregister_netdev - remove device from the kernel
-- 
2.26.2