netdev - [PATCH net-next 08/11] net: assert the rtnl lock is held when calling __netif_set_xps

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Date:   Thu, 28 Jan 2021 15:44:02 +0100
From:   Antoine Tenart <atenart@...nel.org>
To:     davem@...emloft.net, kuba@...nel.org, alexander.duyck@...il.com
Cc:     Antoine Tenart <atenart@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH net-next 08/11] net: assert the rtnl lock is held when calling __netif_set_xps_queue

Add ASSERT_RTNL at the top of __netif_set_xps_queue and add a comment
about holding the rtnl lock before the function.

Suggested-by: Alexander Duyck <alexander.duyck@...il.com>
Signed-off-by: Antoine Tenart <atenart@...nel.org>
---
 net/core/dev.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 2a0a777390c6..c639761ddb5e 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -2623,7 +2623,7 @@ static void xps_copy_dev_maps(struct xps_dev_maps *dev_maps,
 	}
 }
 
-/* Must be called under cpus_read_lock */
+/* Must be called under rtnl_lock and cpus_read_lock */
 int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
 			  u16 index, bool is_rxqs_map)
 {
@@ -2635,6 +2635,8 @@ int __netif_set_xps_queue(struct net_device *dev, const unsigned long *mask,
 	struct xps_map *map, *new_map;
 	unsigned int nr_ids;
 
+	ASSERT_RTNL();
+
 	if (dev->num_tc) {
 		/* Do not allow XPS on subordinate device directly */
 		num_tc = dev->num_tc;
-- 
2.29.2