netdev - [PATCH net-next] net: mscc: ocelot: adjust maxlen on NPI port, not CPU

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Message-Id: <20200313134651.5771-1-olteanv@gmail.com>
Date:   Fri, 13 Mar 2020 15:46:51 +0200
From:   Vladimir Oltean <olteanv@...il.com>
To:     davem@...emloft.net
Cc:     horatiu.vultur@...rochip.com, alexandre.belloni@...tlin.com,
        andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
        joergen.andreasen@...rochip.com, allan.nielsen@...rochip.com,
        claudiu.manoil@....com, netdev@...r.kernel.org,
        UNGLinuxDriver@...rochip.com, alexandru.marginean@....com,
        xiaoliang.yang_1@....com, yangbo.lu@....com, po.liu@....com
Subject: [PATCH net-next] net: mscc: ocelot: adjust maxlen on NPI port, not CPU

From: Vladimir Oltean <vladimir.oltean@....com>

Being a non-physical port, the CPU port does not have an ocelot_port
structure, so the ocelot_port_writel call inside the
ocelot_port_set_maxlen() function would access data behind a NULL
pointer.

This is a patch for net-next only, the net tree boots fine, the bug was
introduced during the net -> net-next merge.

Fixes: 1d3435793123 ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net")
Fixes: a8015ded89ad ("net: mscc: ocelot: properly account for VLAN header length when setting MRU")
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
 drivers/net/ethernet/mscc/ocelot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 460dba862d24..38e9210f6099 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -2359,7 +2359,7 @@ void ocelot_configure_cpu(struct ocelot *ocelot, int npi,
 		else if (injection == OCELOT_TAG_PREFIX_LONG)
 			sdu += OCELOT_LONG_PREFIX_LEN;
 
-		ocelot_port_set_maxlen(ocelot, cpu, sdu);
+		ocelot_port_set_maxlen(ocelot, npi, sdu);
 
 		/* Enable NPI port */
 		ocelot_write_rix(ocelot,
-- 
2.17.1