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

[Loys Ollivier]

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 <lolliv...@baylibre.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