net: dsa: xrs700x: be compatible with masters which unregister on shutdown

Since commit 2f1e8ea726 ("net: dsa: link interfaces with the DSA
master to get rid of lockdep warnings"), DSA gained a requirement which
it did not fulfill, which is to unlink itself from the DSA master at
shutdown time.

Since the Arrow SpeedChips XRS700x driver was introduced after the bad
commit, it has never worked with DSA masters which decide to unregister
their net_device on shutdown, effectively hanging the reboot process.
To fix that, we need to call dsa_switch_shutdown.

These devices can be connected by I2C or by MDIO, and if I search for
I2C or MDIO bus drivers that implement their ->shutdown by redirecting
it to ->remove I don't see any, however this does not mean it would not
be possible. To be compatible with that pattern, it is necessary to
implement an "if this then not that" scheme, to avoid ->remove and
->shutdown from being called both for the same struct device.

Fixes: ee00b24f32 ("net: dsa: add Arrow SpeedChips XRS700x driver")
Link: https://lore.kernel.org/netdev/20210909095324.12978-1-LinoSanfilippo@gmx.de/
Reported-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: George McCollister <george.mccollister@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/xrs700x/xrs700x.c

@@ -822,6 +822,12 @@ void xrs700x_switch_remove(struct xrs700x *priv)
 }
 EXPORT_SYMBOL(xrs700x_switch_remove);
 
+void xrs700x_switch_shutdown(struct xrs700x *priv)
+{
+	dsa_switch_shutdown(priv->ds);
+}
+EXPORT_SYMBOL(xrs700x_switch_shutdown);
+
 MODULE_AUTHOR("George McCollister <george.mccollister@gmail.com>");
 MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA driver");
 MODULE_LICENSE("GPL v2");

drivers/net/dsa/xrs700x/xrs700x.h

@@ -40,3 +40,4 @@ struct xrs700x {
 struct xrs700x *xrs700x_switch_alloc(struct device *base, void *devpriv);
 int xrs700x_switch_register(struct xrs700x *priv);
 void xrs700x_switch_remove(struct xrs700x *priv);
+void xrs700x_switch_shutdown(struct xrs700x *priv);

drivers/net/dsa/xrs700x/xrs700x_i2c.c

@@ -109,11 +109,28 @@ static int xrs700x_i2c_remove(struct i2c_client *i2c)
 {
 	struct xrs700x *priv = i2c_get_clientdata(i2c);
 
+	if (!priv)
+		return 0;
+
 	xrs700x_switch_remove(priv);
 
+	i2c_set_clientdata(i2c, NULL);
+
 	return 0;
 }
 
+static void xrs700x_i2c_shutdown(struct i2c_client *i2c)
+{
+	struct xrs700x *priv = i2c_get_clientdata(i2c);
+
+	if (!priv)
+		return;
+
+	xrs700x_switch_shutdown(priv);
+
+	i2c_set_clientdata(i2c, NULL);
+}
+
 static const struct i2c_device_id xrs700x_i2c_id[] = {
 	{ "xrs700x-switch", 0 },
 	{},
@@ -137,6 +154,7 @@ static struct i2c_driver xrs700x_i2c_driver = {
 	},
 	.probe	= xrs700x_i2c_probe,
 	.remove	= xrs700x_i2c_remove,
+	.shutdown = xrs700x_i2c_shutdown,
 	.id_table = xrs700x_i2c_id,
 };
 

drivers/net/dsa/xrs700x/xrs700x_mdio.c

@@ -136,7 +136,24 @@ static void xrs700x_mdio_remove(struct mdio_device *mdiodev)
 {
 	struct xrs700x *priv = dev_get_drvdata(&mdiodev->dev);
 
+	if (!priv)
+		return;
+
 	xrs700x_switch_remove(priv);
+
+	dev_set_drvdata(&mdiodev->dev, NULL);
+}
+
+static void xrs700x_mdio_shutdown(struct mdio_device *mdiodev)
+{
+	struct xrs700x *priv = dev_get_drvdata(&mdiodev->dev);
+
+	if (!priv)
+		return;
+
+	xrs700x_switch_shutdown(priv);
+
+	dev_set_drvdata(&mdiodev->dev, NULL);
 }
 
 static const struct of_device_id __maybe_unused xrs700x_mdio_dt_ids[] = {
@@ -155,6 +172,7 @@ static struct mdio_driver xrs700x_mdio_driver = {
 	},
 	.probe	= xrs700x_mdio_probe,
 	.remove	= xrs700x_mdio_remove,
+	.shutdown = xrs700x_mdio_shutdown,
 };
 
 mdio_module_driver(xrs700x_mdio_driver);