[Linux-kernel-mentees] [PATCH v2 0/2] smsc: use generic power management

[Linux-kernel-mentees] [PATCH v2 0/2] smsc: use generic power management

[Vaibhav Gupta]

Linux Kernel Mentee: Remove Legacy Power Management.

The purpose of this patch series is to remove legacy power management callbacks
from smsc ethernet drivers.

The callbacks performing suspend() and resume() operations are still calling
pci_save_state(), pci_set_power_state(), etc. and handling the power management
themselves, which is not recommended.

The conversion requires the removal of the those function calls and change the
callback definition accordingly and make use of dev_pm_ops structure.

All patches are compile-tested only.

V2: Kbuild in V1, warning: variable 'err' is used uninitialized whenever 'if'
conditio is false in funcution .resume() .

Vaibhav Gupta (2):
  epic100: use generic power management
  smsc9420: use generic power management

 drivers/net/ethernet/smsc/epic100.c  | 19 +++++--------
 drivers/net/ethernet/smsc/smsc9420.c | 40 ++++++++--------------------
 2 files changed, 17 insertions(+), 42 deletions(-)

-- 
2.27.0

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[Linux-kernel-mentees] [PATCH v2 1/2] epic100: use generic power management

[Vaibhav Gupta]

Drivers should not use legacy power management as they have to manage power
states and related operations, for the device, themselves.

With generic PM, all essentials will be handled by the PCI core. Driver
needs to do only device-specific operations.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/ethernet/smsc/epic100.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/drivers/net/ethernet/smsc/epic100.c b/drivers/net/ethernet/smsc/epic100.c
index 61ddee0c2a2e..d950b312c418 100644
--- a/drivers/net/ethernet/smsc/epic100.c
+++ b/drivers/net/ethernet/smsc/epic100.c
@@ -1512,12 +1512,9 @@ static void epic_remove_one(struct pci_dev *pdev)
 	/* pci_power_off(pdev, -1); */
 }
 
-
-#ifdef CONFIG_PM
-
-static int epic_suspend (struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused epic_suspend(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata(pdev);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 	struct epic_private *ep = netdev_priv(dev);
 	void __iomem *ioaddr = ep->ioaddr;
 
@@ -1531,9 +1528,9 @@ static int epic_suspend (struct pci_dev *pdev, pm_message_t state)
 }
 
 
-static int epic_resume (struct pci_dev *pdev)
+static int __maybe_unused epic_resume(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata(pdev);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 
 	if (!netif_running(dev))
 		return 0;
@@ -1542,18 +1539,14 @@ static int epic_resume (struct pci_dev *pdev)
 	return 0;
 }
 
-#endif /* CONFIG_PM */
-
+static SIMPLE_DEV_PM_OPS(epic_pm_ops, epic_suspend, epic_resume);
 
 static struct pci_driver epic_driver = {
 	.name		= DRV_NAME,
 	.id_table	= epic_pci_tbl,
 	.probe		= epic_init_one,
 	.remove		= epic_remove_one,
-#ifdef CONFIG_PM
-	.suspend	= epic_suspend,
-	.resume		= epic_resume,
-#endif /* CONFIG_PM */
+	.driver.pm	= &epic_pm_ops,
 };
 
 
-- 
2.27.0

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[Linux-kernel-mentees] [PATCH v2 2/2] smsc9420: use generic power management

[Vaibhav Gupta]

Drivers should not use legacy power management as they have to manage power
states and related operations, for the device, themselves. This driver was
handling them with the help of PCI helper functions.

With generic PM, all essentials will be handled by the PCI core. Driver
needs to do only device-specific operations.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/ethernet/smsc/smsc9420.c | 40 ++++++++--------------------
 1 file changed, 11 insertions(+), 29 deletions(-)

diff --git a/drivers/net/ethernet/smsc/smsc9420.c b/drivers/net/ethernet/smsc/smsc9420.c
index 7312e522c022..42bef04d65ba 100644
--- a/drivers/net/ethernet/smsc/smsc9420.c
+++ b/drivers/net/ethernet/smsc/smsc9420.c
@@ -1422,11 +1422,9 @@ static int smsc9420_open(struct net_device *dev)
 	return result;
 }
 
-#ifdef CONFIG_PM
-
-static int smsc9420_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused smsc9420_suspend(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata(pdev);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 	struct smsc9420_pdata *pd = netdev_priv(dev);
 	u32 int_cfg;
 	ulong flags;
@@ -1451,34 +1449,21 @@ static int smsc9420_suspend(struct pci_dev *pdev, pm_message_t state)
 		netif_device_detach(dev);
 	}
 
-	pci_save_state(pdev);
-	pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
-	pci_disable_device(pdev);
-	pci_set_power_state(pdev, pci_choose_state(pdev, state));
+	device_wakeup_disable(dev_d);
 
 	return 0;
 }
 
-static int smsc9420_resume(struct pci_dev *pdev)
+static int __maybe_unused smsc9420_resume(struct device *dev_d)
 {
-	struct net_device *dev = pci_get_drvdata(pdev);
-	struct smsc9420_pdata *pd = netdev_priv(dev);
+	struct net_device *dev = dev_get_drvdata(dev_d);
 	int err;
 
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
-
-	err = pci_enable_device(pdev);
-	if (err)
-		return err;
+	pci_set_master(to_pci_dev(dev_d));
 
-	pci_set_master(pdev);
-
-	err = pci_enable_wake(pdev, PCI_D0, 0);
-	if (err)
-		netif_warn(pd, ifup, pd->dev, "pci_enable_wake failed: %d\n",
-			   err);
+	device_wakeup_disable(dev_d);
 
+	err = 0;
 	if (netif_running(dev)) {
 		/* FIXME: gross. It looks like ancient PM relic.*/
 		err = smsc9420_open(dev);
@@ -1487,8 +1472,6 @@ static int smsc9420_resume(struct pci_dev *pdev)
 	return err;
 }
 
-#endif /* CONFIG_PM */
-
 static const struct net_device_ops smsc9420_netdev_ops = {
 	.ndo_open		= smsc9420_open,
 	.ndo_stop		= smsc9420_stop,
@@ -1658,15 +1641,14 @@ static void smsc9420_remove(struct pci_dev *pdev)
 	pci_disable_device(pdev);
 }
 
+static SIMPLE_DEV_PM_OPS(smsc9420_pm_ops, smsc9420_suspend, smsc9420_resume);
+
 static struct pci_driver smsc9420_driver = {
 	.name = DRV_NAME,
 	.id_table = smsc9420_id_table,
 	.probe = smsc9420_probe,
 	.remove = smsc9420_remove,
-#ifdef CONFIG_PM
-	.suspend = smsc9420_suspend,
-	.resume = smsc9420_resume,
-#endif /* CONFIG_PM */
+	.driver.pm = &smsc9420_pm_ops,
 };
 
 static int __init smsc9420_init_module(void)
-- 
2.27.0

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Re: [Linux-kernel-mentees] [PATCH v2 0/2] smsc: use generic power management

[David Miller]

From: Vaibhav Gupta <vaibhavgupta40@gmail.com>
Date: Fri,  3 Jul 2020 08:31:36 +0530

> Linux Kernel Mentee: Remove Legacy Power Management.
> 
> The purpose of this patch series is to remove legacy power management callbacks
> from smsc ethernet drivers.
> 
> The callbacks performing suspend() and resume() operations are still calling
> pci_save_state(), pci_set_power_state(), etc. and handling the power management
> themselves, which is not recommended.
> 
> The conversion requires the removal of the those function calls and change the
> callback definition accordingly and make use of dev_pm_ops structure.
> 
> All patches are compile-tested only.
> 
> V2: Kbuild in V1, warning: variable 'err' is used uninitialized whenever 'if'
> conditio is false in funcution .resume() .

Series applied to net-next, thanks.
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