linux-kernel - [PATCH net v2] net: ethtool: tsinfo: Fix dump command

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Message-Id: <20250307091255.463559-1-kory.maincent@bootlin.com>
Date: Fri,  7 Mar 2025 10:12:55 +0100
From: Kory Maincent <kory.maincent@...tlin.com>
To: "David S. Miller" <davem@...emloft.net>,
	Kory Maincent <kory.maincent@...tlin.com>,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Vadim Fedorenko <vadim.fedorenko@...ux.dev>,
	thomas.petazzoni@...tlin.com,
	Andrew Lunn <andrew@...n.ch>,
	Jakub Kicinski <kuba@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>
Subject: [PATCH net v2] net: ethtool: tsinfo: Fix dump command

Fix missing initialization of ts_info->phc_index in the dump command,
which could cause a netdev interface to incorrectly display a PTP provider
at index 0 instead of "none".
Fix it by initializing the phc_index to -1.

In the same time, restore missing initialization of ts_info.cmd for the
IOCTL case, as it was before the transition from ethnl_default_dumpit to
custom ethnl_tsinfo_dumpit.

Also, remove unnecessary zeroing of ts_info, as it is embedded within
reply_data, which is fully zeroed two lines earlier.

Fixes: b9e3f7dc9ed95 ("net: ethtool: tsinfo: Enhance tsinfo to support several hwtstamp by net topology")
Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>
---

Change in v2:
- Remove useless zeroed of ts_info.
---
 net/ethtool/tsinfo.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ethtool/tsinfo.c b/net/ethtool/tsinfo.c
index 691be6c445b38..ad3866c5a902b 100644
--- a/net/ethtool/tsinfo.c
+++ b/net/ethtool/tsinfo.c
@@ -290,7 +290,8 @@ static void *ethnl_tsinfo_prepare_dump(struct sk_buff *skb,
 	reply_data = ctx->reply_data;
 	memset(reply_data, 0, sizeof(*reply_data));
 	reply_data->base.dev = dev;
-	memset(&reply_data->ts_info, 0, sizeof(reply_data->ts_info));
+	reply_data->ts_info.cmd = ETHTOOL_GET_TS_INFO;
+	reply_data->ts_info.phc_index = -1;
 
 	return ehdr;
 }
-- 
2.34.1