netdev - [PATCH net] ethtool: fix error handling in linkstate_prepare

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Message-Id: <20200624220908.E2C5460460@lion.mk-sys.cz>
Date:   Thu, 25 Jun 2020 00:09:08 +0200 (CEST)
From:   Michal Kubecek <mkubecek@...e.cz>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>
Subject: [PATCH net] ethtool: fix error handling in linkstate_prepare_data()

When getting SQI or maximum SQI value fails in linkstate_prepare_data(), we
must not return without calling ethnl_ops_complete(dev) as that could
result in imbalance between ethtool_ops ->begin() and ->complete() calls.

Fixes: 806602191592 ("ethtool: provide UAPI for PHY Signal Quality Index (SQI)")
Signed-off-by: Michal Kubecek <mkubecek@...e.cz>
---
 net/ethtool/linkstate.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/net/ethtool/linkstate.c b/net/ethtool/linkstate.c
index 7f47ba89054e..afe5ac8a0f00 100644
--- a/net/ethtool/linkstate.c
+++ b/net/ethtool/linkstate.c
@@ -78,19 +78,18 @@ static int linkstate_prepare_data(const struct ethnl_req_info *req_base,
 
 	ret = linkstate_get_sqi(dev);
 	if (ret < 0 && ret != -EOPNOTSUPP)
-		return ret;
-
+		goto out;
 	data->sqi = ret;
 
 	ret = linkstate_get_sqi_max(dev);
 	if (ret < 0 && ret != -EOPNOTSUPP)
-		return ret;
-
+		goto out;
 	data->sqi_max = ret;
 
+	ret = 0;
+out:
 	ethnl_ops_complete(dev);
-
-	return 0;
+	return ret;
 }
 
 static int linkstate_reply_size(const struct ethnl_req_info *req_base,
-- 
2.27.0