linux-kernel - [PATCH AUTOSEL 5.16 108/217] net: dsa: ocelot: felix: Remove requirement for PCS in felix devices

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Message-Id: <20220118021940.1942199-108-sashal@kernel.org>
Date:   Mon, 17 Jan 2022 21:17:51 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Colin Foster <colin.foster@...advantage.com>,
        Vladimir Oltean <vladimir.oltean@....com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Sasha Levin <sashal@...nel.org>, claudiu.manoil@....com,
        alexandre.belloni@...tlin.com, UNGLinuxDriver@...rochip.com,
        andrew@...n.ch, vivien.didelot@...il.com, davem@...emloft.net,
        linux@...linux.org.uk, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.16 108/217] net: dsa: ocelot: felix: Remove requirement for PCS in felix devices

From: Colin Foster <colin.foster@...advantage.com>

[ Upstream commit 49af6a7620c53b779572abfbfd7778e113154330 ]

Existing felix devices all have an initialized pcs array. Future devices
might not, so running a NULL check on the array before dereferencing it
will allow those future drivers to not crash at this point

Signed-off-by: Colin Foster <colin.foster@...advantage.com>
Reviewed-by: Vladimir Oltean <vladimir.oltean@....com>
Reviewed-by: Florian Fainelli <f.fainelli@...il.com>
Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/dsa/ocelot/felix.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index f1a05e7dc8181..221440a61e17e 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -823,7 +823,7 @@ static void felix_phylink_mac_config(struct dsa_switch *ds, int port,
 	struct felix *felix = ocelot_to_felix(ocelot);
 	struct dsa_port *dp = dsa_to_port(ds, port);
 
-	if (felix->pcs[port])
+	if (felix->pcs && felix->pcs[port])
 		phylink_set_pcs(dp->pl, &felix->pcs[port]->pcs);
 }
 
-- 
2.34.1