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Subject[PATCH 5.3 10/21] net: stmmac: Hold rtnl lock in suspend/resume callbacks
Date
From: Jose Abreu <Jose.Abreu@synopsys.com>

[ Upstream commit 19e13cb27b998ff49f07e399b5871bfe5ba7e3f0 ]

We need to hold rnl lock in suspend and resume callbacks because phylink
requires it. Otherwise we will get a WARN() in suspend and resume.

Also, move phylink start and stop callbacks to inside device's internal
lock so that we prevent concurrent HW accesses.

Fixes: 74371272f97f ("net: stmmac: Convert to phylink and remove phylib logic")
Reported-by: Christophe ROULLIER <christophe.roullier@st.com>
Tested-by: Christophe ROULLIER <christophe.roullier@st.com>
Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)

--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4451,10 +4451,12 @@ int stmmac_suspend(struct device *dev)
if (!ndev || !netif_running(ndev))
return 0;

- phylink_stop(priv->phylink);
-
mutex_lock(&priv->lock);

+ rtnl_lock();
+ phylink_stop(priv->phylink);
+ rtnl_unlock();
+
netif_device_detach(ndev);
stmmac_stop_all_queues(priv);

@@ -4558,9 +4560,11 @@ int stmmac_resume(struct device *dev)

stmmac_start_all_queues(priv);

- mutex_unlock(&priv->lock);
-
+ rtnl_lock();
phylink_start(priv->phylink);
+ rtnl_unlock();
+
+ mutex_unlock(&priv->lock);

return 0;
}

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