netdev - [PATCH RFC net-next 2/7] net: sfp: move rtnl lock to cover reading state

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Date: Wed, 10 May 2023 12:23:21 +0100
From: "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>
To: Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>
Cc: Daniel Golle <daniel@...rotopia.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org
Subject: [PATCH RFC net-next 2/7] net: sfp: move rtnl lock to cover reading
 state

As preparation to moving st_mutex inside rtnl_lock, we need to first
move the rtnl lock to cover reading the state.

Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
---
 drivers/net/phy/sfp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index c97a87393fdb..3fc703e4dd21 100644
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -2601,6 +2601,7 @@ static void sfp_check_state(struct sfp *sfp)
 	unsigned int state, i, changed;
 
 	mutex_lock(&sfp->st_mutex);
+	rtnl_lock();
 	state = sfp_get_state(sfp);
 	changed = state ^ sfp->state;
 	if (sfp->tx_fault_ignore)
@@ -2616,7 +2617,6 @@ static void sfp_check_state(struct sfp *sfp)
 	state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
 	sfp->state = state;
 
-	rtnl_lock();
 	if (changed & SFP_F_PRESENT)
 		sfp_sm_event(sfp, state & SFP_F_PRESENT ?
 				SFP_E_INSERT : SFP_E_REMOVE);
-- 
2.30.2