can: m_can: use struct m_can_classdev as drvdata

The m_can driver's suspend and resume functions (m_can_class_suspend() and
m_can_class_resume()) make use of dev_get_drvdata() and assume that the drvdata
is a pointer to the struct net_device.

With upcoming conversion of the tcan4x5x driver to pm_runtime this assumption
is no longer valid. As the suspend and resume functions actually need a struct
m_can_classdev pointer, change the m_can_platform and the m_can_pci driver to
hold a pointer to struct m_can_classdev instead, as the tcan4x5x driver already
does.

Link: https://lore.kernel.org/r/20201212175518.139651-8-mkl@pengutronix.de
Reviewed-by: Sean Nyekjaer <sean@geanix.com>
Reviewed-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/m_can/m_can.c

@@ -1859,8 +1859,8 @@ EXPORT_SYMBOL_GPL(m_can_class_unregister);
 
 int m_can_class_suspend(struct device *dev)
 {
-	struct net_device *ndev = dev_get_drvdata(dev);
-	struct m_can_classdev *cdev = netdev_priv(ndev);
+	struct m_can_classdev *cdev = dev_get_drvdata(dev);
+	struct net_device *ndev = cdev->net;
 
 	if (netif_running(ndev)) {
 		netif_stop_queue(ndev);
@@ -1879,8 +1879,8 @@ EXPORT_SYMBOL_GPL(m_can_class_suspend);
 
 int m_can_class_resume(struct device *dev)
 {
-	struct net_device *ndev = dev_get_drvdata(dev);
-	struct m_can_classdev *cdev = netdev_priv(ndev);
+	struct m_can_classdev *cdev = dev_get_drvdata(dev);
+	struct net_device *ndev = cdev->net;
 
 	pinctrl_pm_select_default_state(dev);
 

drivers/net/can/m_can/m_can_pci.c

@@ -115,7 +115,7 @@ static int m_can_pci_probe(struct pci_dev *pci, const struct pci_device_id *id)
 	mcan_class->can.clock.freq = id->driver_data;
 	mcan_class->ops = &m_can_pci_ops;
 
-	pci_set_drvdata(pci, mcan_class->net);
+	pci_set_drvdata(pci, mcan_class);
 
 	ret = m_can_class_register(mcan_class);
 	if (ret)
@@ -138,8 +138,7 @@ err:
 
 static void m_can_pci_remove(struct pci_dev *pci)
 {
-	struct net_device *dev = pci_get_drvdata(pci);
-	struct m_can_classdev *mcan_class = netdev_priv(dev);
+	struct m_can_classdev *mcan_class = pci_get_drvdata(pci);
 	struct m_can_pci_priv *priv = cdev_to_priv(mcan_class);
 
 	pm_runtime_forbid(&pci->dev);

drivers/net/can/m_can/m_can_platform.c

@@ -113,7 +113,7 @@ static int m_can_plat_probe(struct platform_device *pdev)
 
 	mcan_class->is_peripheral = false;
 
-	platform_set_drvdata(pdev, mcan_class->net);
+	platform_set_drvdata(pdev, mcan_class);
 
 	m_can_init_ram(mcan_class);
 
@@ -143,8 +143,8 @@ static __maybe_unused int m_can_resume(struct device *dev)
 
 static int m_can_plat_remove(struct platform_device *pdev)
 {
-	struct net_device *dev = platform_get_drvdata(pdev);
-	struct m_can_classdev *mcan_class = netdev_priv(dev);
+	struct m_can_plat_priv *priv = platform_get_drvdata(pdev);
+	struct m_can_classdev *mcan_class = &priv->cdev;
 
 	m_can_class_unregister(mcan_class);
 
@@ -155,8 +155,8 @@ static int m_can_plat_remove(struct platform_device *pdev)
 
 static int __maybe_unused m_can_runtime_suspend(struct device *dev)
 {
-	struct net_device *ndev = dev_get_drvdata(dev);
-	struct m_can_classdev *mcan_class = netdev_priv(ndev);
+	struct m_can_plat_priv *priv = dev_get_drvdata(dev);
+	struct m_can_classdev *mcan_class = &priv->cdev;
 
 	clk_disable_unprepare(mcan_class->cclk);
 	clk_disable_unprepare(mcan_class->hclk);
@@ -166,8 +166,8 @@ static int __maybe_unused m_can_runtime_suspend(struct device *dev)
 
 static int __maybe_unused m_can_runtime_resume(struct device *dev)
 {
-	struct net_device *ndev = dev_get_drvdata(dev);
-	struct m_can_classdev *mcan_class = netdev_priv(ndev);
+	struct m_can_plat_priv *priv = dev_get_drvdata(dev);
+	struct m_can_classdev *mcan_class = &priv->cdev;
 	int err;
 
 	err = clk_prepare_enable(mcan_class->hclk);