net: dsa: legacy: simplify getting .driver_data

We should get 'driver_data' from 'struct device' directly. Going via
platform_device is an unneeded step back and forth.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/dsa/legacy.c

@@ -686,8 +686,7 @@ static void dsa_shutdown(struct platform_device *pdev)
 #ifdef CONFIG_PM_SLEEP
 static int dsa_suspend(struct device *d)
 {
-	struct platform_device *pdev = to_platform_device(d);
-	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
+	struct dsa_switch_tree *dst = dev_get_drvdata(d);
 	int i, ret = 0;
 
 	for (i = 0; i < dst->pd->nr_chips; i++) {
@@ -702,8 +701,7 @@ static int dsa_suspend(struct device *d)
 
 static int dsa_resume(struct device *d)
 {
-	struct platform_device *pdev = to_platform_device(d);
-	struct dsa_switch_tree *dst = platform_get_drvdata(pdev);
+	struct dsa_switch_tree *dst = dev_get_drvdata(d);
 	int i, ret = 0;
 
 	for (i = 0; i < dst->pd->nr_chips; i++) {