[PATCH net 3/5] net: dsa: sja1105: Really fix panic on unregistering PTP clock

[Vladimir Oltean]

The IS_ERR_OR_NULL(priv->clock) check inside
sja1105_ptp_clock_unregister() is preventing cancel_delayed_work_sync
from actually being run.

Additionally, sja1105_ptp_clock_unregister() does not actually get run,
when placed in sja1105_remove(). The DSA switch gets torn down, but the
sja1105 module does not get unregistered. So sja1105_ptp_clock_unregister
needs to be moved to sja1105_teardown, to be symmetrical with
sja1105_ptp_clock_register which is called from the DSA sja1105_setup.

It is strange to fix a "fixes" patch, but the probe failure can only be
seen when the attached PHY does not respond to MDIO (issue which I can't
pinpoint the reason to) and it goes away after I power-cycle the board.
This time the patch was validated on a failing board, and the kernel
panic from the fixed commit's message can no longer be seen.

Fixes: 29dd908d355f ("net: dsa: sja1105: Cancel PTP delayed work on unregister")
Signed-off-by: Vladimir Oltean <olte...@gmail.com>
---
 drivers/net/dsa/sja1105/sja1105_main.c | 4 ++--
 drivers/net/dsa/sja1105/sja1105_ptp.c  | 7 +++----
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/net/dsa/sja1105/sja1105_main.c 
b/drivers/net/dsa/sja1105/sja1105_main.c
index fd036bf0a819..13c22f51d476 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -1725,6 +1725,8 @@ static void sja1105_teardown(struct dsa_switch *ds)
 
        cancel_work_sync(&priv->tagger_data.rxtstamp_work);
        skb_queue_purge(&priv->tagger_data.skb_rxtstamp_queue);
+       sja1105_ptp_clock_unregister(priv);
+       sja1105_static_config_free(&priv->static_config);
 }
 
 static int sja1105_mgmt_xmit(struct dsa_switch *ds, int port, int slot,
@@ -2182,9 +2184,7 @@ static int sja1105_remove(struct spi_device *spi)
 {
        struct sja1105_private *priv = spi_get_drvdata(spi);
 
-       sja1105_ptp_clock_unregister(priv);
        dsa_unregister_switch(priv->ds);
-       sja1105_static_config_free(&priv->static_config);
        return 0;
 }
 
diff --git a/drivers/net/dsa/sja1105/sja1105_ptp.c 
b/drivers/net/dsa/sja1105/sja1105_ptp.c
index d19cfdf681af..d8e8dd59f3d1 100644
--- a/drivers/net/dsa/sja1105/sja1105_ptp.c
+++ b/drivers/net/dsa/sja1105/sja1105_ptp.c
@@ -369,16 +369,15 @@ int sja1105_ptp_clock_register(struct sja1105_private 
*priv)
                .mult = SJA1105_CC_MULT,
        };
        mutex_init(&priv->ptp_lock);
-       INIT_DELAYED_WORK(&priv->refresh_work, sja1105_ptp_overflow_check);
-
-       schedule_delayed_work(&priv->refresh_work, SJA1105_REFRESH_INTERVAL);
-
        priv->ptp_caps = sja1105_ptp_caps;
 
        priv->clock = ptp_clock_register(&priv->ptp_caps, ds->dev);
        if (IS_ERR_OR_NULL(priv->clock))
                return PTR_ERR(priv->clock);
 
+       INIT_DELAYED_WORK(&priv->refresh_work, sja1105_ptp_overflow_check);
+       schedule_delayed_work(&priv->refresh_work, SJA1105_REFRESH_INTERVAL);
+
        return sja1105_ptp_reset(priv);
 }
 
-- 
2.17.1