netdev - [PATCH] net: stmmac: Fix ASSERT_RTNL() warning on suspend/resume

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Message-Id: <1568714556-25024-1-git-send-email-lollivier@baylibre.com>
Date:   Tue, 17 Sep 2019 12:02:36 +0200
From:   Loys Ollivier <lollivier@...libre.com>
To:     Russell King <linux@...linux.org.uk>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc:     Loys Ollivier <lollivier@...libre.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net: stmmac: Fix ASSERT_RTNL() warning on suspend/resume

rtnl_lock needs to be taken before calling phylink_start/stop to lock the
network stack.
Fix ASSERT_RTNL() warnings by protecting such calls with lock/unlock.

Fixes: 74371272f97f ("net: stmmac: Convert to phylink and remove phylib logic")
Signed-off-by: Loys Ollivier <lollivier@...libre.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index fd54c7c87485..485f33f57b43 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4451,7 +4451,9 @@ int stmmac_suspend(struct device *dev)
 	if (!ndev || !netif_running(ndev))
 		return 0;
 
+	rtnl_lock();
 	phylink_stop(priv->phylink);
+	rtnl_unlock();
 
 	mutex_lock(&priv->lock);
 
@@ -4560,7 +4562,9 @@ int stmmac_resume(struct device *dev)
 
 	mutex_unlock(&priv->lock);
 
+	rtnl_lock();
 	phylink_start(priv->phylink);
+	rtnl_unlock();
 
 	return 0;
 }
-- 
2.7.4