[PATCH 4.4 25/33] can: c_can: move runtime PM enable/disable to c_can_platform

Greg Kroah-Hartman
2021-03-29T08:01:55Z

From: Tong Zhang <ztong0001@gmail.com>

[ Upstream commit 6e2fe01dd6f98da6cae8b07cd5cfa67abc70d97d ]

Currently doing modprobe c_can_pci will make the kernel complain:

Unbalanced pm_runtime_enable!

this is caused by pm_runtime_enable() called before pm is initialized.

This fix is similar to 227619c3ff7c, move those pm_enable/disable code
to c_can_platform.

Fixes: 4cdd34b26826 ("can: c_can: Add runtime PM support to Bosch C_CAN/D_CAN controller")
Link: http://lore.kernel.org/r/20210302025542.987600-1-ztong0001@gmail.com
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Tested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/can/c_can/c_can.c | 24 +-----------------------
drivers/net/can/c_can/c_can_platform.c | 6 +++++-
2 files changed, 6 insertions(+), 24 deletions(-)

diff --git a/drivers/net/can/c_can/c_can.c b/drivers/net/can/c_can/c_can.c
index 4ead5a18b794..c41ab2cb272e 100644
--- a/drivers/net/can/c_can/c_can.c
+++ b/drivers/net/can/c_can/c_can.c
@@ -212,18 +212,6 @@ static const struct can_bittiming_const c_can_bittiming_const = {
.brp_inc = 1,
};

-static inline void c_can_pm_runtime_enable(const struct c_can_priv *priv)
-{
- if (priv->device)
- pm_runtime_enable(priv->device);
-}
-
-static inline void c_can_pm_runtime_disable(const struct c_can_priv *priv)
-{
- if (priv->device)
- pm_runtime_disable(priv->device);
-}
-
static inline void c_can_pm_runtime_get_sync(const struct c_can_priv *priv)
{
if (priv->device)
@@ -1318,7 +1306,6 @@ static const struct net_device_ops c_can_netdev_ops = {

int register_c_can_dev(struct net_device *dev)
{
- struct c_can_priv *priv = netdev_priv(dev);
int err;

/* Deactivate pins to prevent DRA7 DCAN IP from being
@@ -1328,28 +1315,19 @@ int register_c_can_dev(struct net_device *dev)
*/
pinctrl_pm_select_sleep_state(dev->dev.parent);

- c_can_pm_runtime_enable(priv);
-
dev->flags |= IFF_ECHO; /* we support local echo */
dev->netdev_ops = &c_can_netdev_ops;

err = register_candev(dev);
- if (err)
- c_can_pm_runtime_disable(priv);
- else
+ if (!err)
devm_can_led_init(dev);
-
return err;
}
EXPORT_SYMBOL_GPL(register_c_can_dev);

void unregister_c_can_dev(struct net_device *dev)
{
- struct c_can_priv *priv = netdev_priv(dev);
-
unregister_candev(dev);
-
- c_can_pm_runtime_disable(priv);
}
EXPORT_SYMBOL_GPL(unregister_c_can_dev);

diff --git a/drivers/net/can/c_can/c_can_platform.c b/drivers/net/can/c_can/c_can_platform.c
index 717530eac70c..c6a03f565e3f 100644
--- a/drivers/net/can/c_can/c_can_platform.c
+++ b/drivers/net/can/c_can/c_can_platform.c
@@ -29,6 +29,7 @@
#include <linux/list.h>
#include <linux/io.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_device.h>
@@ -385,6 +386,7 @@ static int c_can_plat_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, &pdev->dev);

+ pm_runtime_enable(priv->device);
ret = register_c_can_dev(dev);
if (ret) {
dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
@@ -397,6 +399,7 @@ static int c_can_plat_probe(struct platform_device *pdev)
return 0;

exit_free_device:
+ pm_runtime_disable(priv->device);
free_c_can_dev(dev);
exit:
dev_err(&pdev->dev, "probe failed\n");
@@ -407,9 +410,10 @@ exit:
static int c_can_plat_remove(struct platform_device *pdev)
{
struct net_device *dev = platform_get_drvdata(pdev);
+ struct c_can_priv *priv = netdev_priv(dev);

unregister_c_can_dev(dev);
-
+ pm_runtime_disable(priv->device);
free_c_can_dev(dev);

return 0;
--
2.30.1