netdev - [PATCH v2 net 5/8] net: mscc: ocelot: error checking when calling ocelot

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Date:   Fri, 18 Sep 2020 04:07:27 +0300
From:   Vladimir Oltean <olteanv@...il.com>
To:     davem@...emloft.net, netdev@...r.kernel.org
Cc:     yangbo.lu@....com, xiaoliang.yang_1@....com,
        UNGLinuxDriver@...rochip.com, claudiu.manoil@....com,
        alexandre.belloni@...tlin.com, andrew@...n.ch,
        vivien.didelot@...il.com, f.fainelli@...il.com, kuba@...nel.org
Subject: [PATCH v2 net 5/8] net: mscc: ocelot: error checking when calling ocelot_init()

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

ocelot_init() allocates memory, resets the switch and polls for a status
register, things which can fail. Stop probing the driver in that case,
and propagate the error result.

Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
Reviewed-by: Horatiu Vultur <horatiu.vultur@...rochip.com>
---
Changes in v2:
Stopped leaking the 'ports' OF node in the VSC7514 driver.

 drivers/net/dsa/ocelot/felix.c             | 5 ++++-
 drivers/net/ethernet/mscc/ocelot_vsc7514.c | 5 ++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/ocelot/felix.c b/drivers/net/dsa/ocelot/felix.c
index a1e1d3824110..f7b43f8d56ed 100644
--- a/drivers/net/dsa/ocelot/felix.c
+++ b/drivers/net/dsa/ocelot/felix.c
@@ -571,7 +571,10 @@ static int felix_setup(struct dsa_switch *ds)
 	if (err)
 		return err;
 
-	ocelot_init(ocelot);
+	err = ocelot_init(ocelot);
+	if (err)
+		return err;
+
 	if (ocelot->ptp) {
 		err = ocelot_init_timestamp(ocelot, &ocelot_ptp_clock_info);
 		if (err) {
diff --git a/drivers/net/ethernet/mscc/ocelot_vsc7514.c b/drivers/net/ethernet/mscc/ocelot_vsc7514.c
index 904ea299a5e8..a1cbb20a7757 100644
--- a/drivers/net/ethernet/mscc/ocelot_vsc7514.c
+++ b/drivers/net/ethernet/mscc/ocelot_vsc7514.c
@@ -1002,7 +1002,10 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 	ocelot->vcap_is2_actions = vsc7514_vcap_is2_actions;
 	ocelot->vcap = vsc7514_vcap_props;
 
-	ocelot_init(ocelot);
+	err = ocelot_init(ocelot);
+	if (err)
+		goto out_put_ports;
+
 	if (ocelot->ptp) {
 		err = ocelot_init_timestamp(ocelot, &ocelot_ptp_clock_info);
 		if (err) {
-- 
2.25.1