From: Jakub Kicinski <kuba@kernel.org>
Date: Tue, 13 Apr 2021 20:46:14 -0700
Subject: ethtool: pause: make sure we init driver stats
Patch-mainline: v5.12-rc8
Git-commit: 16756d3e77ad58cd07e36cbed724aa13ae5a0278
References: jsc#SLE-15075

The intention was for pause statistics to not be reported
when driver does not have the relevant callback (only
report an empty netlink nest). What happens currently
we report all 0s instead. Make sure statistics are
initialized to "not set" (which is -1) so the dumping
code skips them.

Fixes: 9a27a33027f2 ("ethtool: add standard pause stats")
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 net/ethtool/pause.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/net/ethtool/pause.c
+++ b/net/ethtool/pause.c
@@ -43,16 +43,16 @@ static int pause_prepare_data(const stru
 	if (!dev->ethtool_ops->get_pauseparam)
 		return -EOPNOTSUPP;
 
+	ethtool_stats_init((u64 *)&data->pausestat,
+			   sizeof(data->pausestat) / 8);
+
 	ret = ethnl_ops_begin(dev);
 	if (ret < 0)
 		return ret;
 	dev->ethtool_ops->get_pauseparam(dev, &data->pauseparam);
 	if (req_base->flags & ETHTOOL_FLAG_STATS &&
-	    dev->ethtool_ops->get_pause_stats) {
-		ethtool_stats_init((u64 *)&data->pausestat,
-				   sizeof(data->pausestat) / 8);
+	    dev->ethtool_ops->get_pause_stats)
 		dev->ethtool_ops->get_pause_stats(dev, &data->pausestat);
-	}
 	ethnl_ops_complete(dev);
 
 	return 0;