[Linux-kernel-mentees] [PATCH v2 0/2] realtek ethernet : remove legacy power management callbacks.

[Linux-kernel-mentees] [PATCH v2 0/2] realtek ethernet : remove legacy power management callbacks.

[Vaibhav Gupta]

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

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

The conversion requires the removal of the those function calls and change the
callback definition accordingly.

Vaibhav Gupta (2):
  realtek/8139too: Remove Legacy Power Management
  realtek/8139cp: Remove Legacy Power Management

 drivers/net/ethernet/realtek/8139cp.c  | 25 +++++++------------------
 drivers/net/ethernet/realtek/8139too.c | 26 +++++++-------------------
 2 files changed, 14 insertions(+), 37 deletions(-)

-- 
2.26.2

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[Linux-kernel-mentees] [PATCH v2 1/2] realtek/8139too: Remove Legacy Power Management

[Vaibhav Gupta]

Upgrade power management from legacy to generic using dev_pm_ops.

Remove "struct pci_driver.suspend" and "struct pci_driver.resume"
bindings, and add "struct pci_driver.driver.pm" .

Add "__maybe_unused" attribute to resume() and susend() callbacks
definition to suppress compiler warnings.

Generic callback requires an argument of type "struct device*". Hence,
convert it to "struct net_device*" using "dev_get_drvdata()" to use
it in the callback.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/ethernet/realtek/8139too.c | 26 +++++++-------------------
 1 file changed, 7 insertions(+), 19 deletions(-)

diff --git a/drivers/net/ethernet/realtek/8139too.c b/drivers/net/ethernet/realtek/8139too.c
index 5caeb8368eab..227139d42227 100644
--- a/drivers/net/ethernet/realtek/8139too.c
+++ b/drivers/net/ethernet/realtek/8139too.c
@@ -2603,17 +2603,13 @@ static void rtl8139_set_rx_mode (struct net_device *dev)
 	spin_unlock_irqrestore (&tp->lock, flags);
 }
 
-#ifdef CONFIG_PM
-
-static int rtl8139_suspend (struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused rtl8139_suspend(struct device *device)
 {
-	struct net_device *dev = pci_get_drvdata (pdev);
+	struct net_device *dev = dev_get_drvdata(device);
 	struct rtl8139_private *tp = netdev_priv(dev);
 	void __iomem *ioaddr = tp->mmio_addr;
 	unsigned long flags;
 
-	pci_save_state (pdev);
-
 	if (!netif_running (dev))
 		return 0;
 
@@ -2631,38 +2627,30 @@ static int rtl8139_suspend (struct pci_dev *pdev, pm_message_t state)
 
 	spin_unlock_irqrestore (&tp->lock, flags);
 
-	pci_set_power_state (pdev, PCI_D3hot);
-
 	return 0;
 }
 
-
-static int rtl8139_resume (struct pci_dev *pdev)
+static int __maybe_unused rtl8139_resume(struct device *device)
 {
-	struct net_device *dev = pci_get_drvdata (pdev);
+	struct net_device *dev = dev_get_drvdata(device);
 
-	pci_restore_state (pdev);
 	if (!netif_running (dev))
 		return 0;
-	pci_set_power_state (pdev, PCI_D0);
+
 	rtl8139_init_ring (dev);
 	rtl8139_hw_start (dev);
 	netif_device_attach (dev);
 	return 0;
 }
 
-#endif /* CONFIG_PM */
-
+static SIMPLE_DEV_PM_OPS(rtl8139_pm_ops, rtl8139_suspend, rtl8139_resume);
 
 static struct pci_driver rtl8139_pci_driver = {
 	.name		= DRV_NAME,
 	.id_table	= rtl8139_pci_tbl,
 	.probe		= rtl8139_init_one,
 	.remove		= rtl8139_remove_one,
-#ifdef CONFIG_PM
-	.suspend	= rtl8139_suspend,
-	.resume		= rtl8139_resume,
-#endif /* CONFIG_PM */
+	.driver.pm	= &rtl8139_pm_ops,
 };
 
 
-- 
2.26.2

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[Linux-kernel-mentees] [PATCH v2 2/2] realtek/8139cp: Remove Legacy Power Management

[Vaibhav Gupta]

Upgrade power management from legacy to generic using dev_pm_ops.

Add "__maybe_unused" attribute to resume() and susend() callbacks
definition to suppress compiler warnings.

Generic callback requires an argument of type "struct device*". Hence,
convert it to "struct net_device*" using "dev_get_drv_data()" to use
it in the callback.

Most of the cleaning part is to remove pci_save_state(),
pci_set_power_state(), etc power management function calls.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@gmail.com>
---
 drivers/net/ethernet/realtek/8139cp.c | 25 +++++++------------------
 1 file changed, 7 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ethernet/realtek/8139cp.c b/drivers/net/ethernet/realtek/8139cp.c
index 60d342f82fb3..4f2fb1393966 100644
--- a/drivers/net/ethernet/realtek/8139cp.c
+++ b/drivers/net/ethernet/realtek/8139cp.c
@@ -2054,10 +2054,9 @@ static void cp_remove_one (struct pci_dev *pdev)
 	free_netdev(dev);
 }
 
-#ifdef CONFIG_PM
-static int cp_suspend (struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused cp_suspend(struct device *device)
 {
-	struct net_device *dev = pci_get_drvdata(pdev);
+	struct net_device *dev = dev_get_drvdata(device);
 	struct cp_private *cp = netdev_priv(dev);
 	unsigned long flags;
 
@@ -2075,16 +2074,12 @@ static int cp_suspend (struct pci_dev *pdev, pm_message_t state)
 
 	spin_unlock_irqrestore (&cp->lock, flags);
 
-	pci_save_state(pdev);
-	pci_enable_wake(pdev, pci_choose_state(pdev, state), cp->wol_enabled);
-	pci_set_power_state(pdev, pci_choose_state(pdev, state));
-
 	return 0;
 }
 
-static int cp_resume (struct pci_dev *pdev)
+static int __maybe_unused cp_resume(struct device *device)
 {
-	struct net_device *dev = pci_get_drvdata (pdev);
+	struct net_device *dev = dev_get_drvdata(device);
 	struct cp_private *cp = netdev_priv(dev);
 	unsigned long flags;
 
@@ -2093,10 +2088,6 @@ static int cp_resume (struct pci_dev *pdev)
 
 	netif_device_attach (dev);
 
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
-	pci_enable_wake(pdev, PCI_D0, 0);
-
 	/* FIXME: sh*t may happen if the Rx ring buffer is depleted */
 	cp_init_rings_index (cp);
 	cp_init_hw (cp);
@@ -2111,7 +2102,6 @@ static int cp_resume (struct pci_dev *pdev)
 
 	return 0;
 }
-#endif /* CONFIG_PM */
 
 static const struct pci_device_id cp_pci_tbl[] = {
         { PCI_DEVICE(PCI_VENDOR_ID_REALTEK,     PCI_DEVICE_ID_REALTEK_8139), },
@@ -2120,15 +2110,14 @@ static const struct pci_device_id cp_pci_tbl[] = {
 };
 MODULE_DEVICE_TABLE(pci, cp_pci_tbl);
 
+static SIMPLE_DEV_PM_OPS(cp_pm_ops, cp_suspend, cp_resume);
+
 static struct pci_driver cp_driver = {
 	.name         = DRV_NAME,
 	.id_table     = cp_pci_tbl,
 	.probe        =	cp_init_one,
 	.remove       = cp_remove_one,
-#ifdef CONFIG_PM
-	.resume       = cp_resume,
-	.suspend      = cp_suspend,
-#endif
+	.driver.pm    = &cp_pm_ops,
 };
 
 module_pci_driver(cp_driver);
-- 
2.26.2

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Re: [Linux-kernel-mentees] [PATCH v2 0/2] realtek ethernet : remove legacy power management callbacks.

[Vaibhav Gupta]

On Tue, 28 Apr 2020 at 23:24, Heiner Kallweit <hkallweit1@gmail.com> wrote:
>
> On 28.04.2020 16:43, Vaibhav Gupta wrote:
> > The purpose of this patch series is to remove legacy power management callbacks
> > from realtek ethernet drivers.
> >
> > The callbacks performing suspend() and resume() operations are still calling
> > pci_save_state(), pci_set_power_state(), etc. and handling the powermanagement
> > themselves, which is not recommended.
> >
> Did you test any of the changes? If not, then mention this at least.
> A typical comment in the commit message would be "compile-tested only".
Yeah its compile-tested only. I should have mention that. Thanks for
pointing it out.
>
> In addition the following should be changed.
> [Linux-kernel-mentees] [PATCH v2 0/2]
> Use
> [PATCH net-next v2 0/2]
> instead.
Sure!

--Vaibhav Gupta
>
> > The conversion requires the removal of the those function calls and change the
> > callback definition accordingly.
> >
> > Vaibhav Gupta (2):
> >   realtek/8139too: Remove Legacy Power Management
> >   realtek/8139cp: Remove Legacy Power Management
> >
> >  drivers/net/ethernet/realtek/8139cp.c  | 25 +++++++------------------
> >  drivers/net/ethernet/realtek/8139too.c | 26 +++++++-------------------
> >  2 files changed, 14 insertions(+), 37 deletions(-)
> >
>

Re: [Linux-kernel-mentees] [PATCH v2 0/2] realtek ethernet : remove legacy power management callbacks.

[Vaibhav Gupta]

On Tue, 28 Apr 2020 at 23:24, Heiner Kallweit <hkallweit1@gmail.com> wrote:
>
> On 28.04.2020 16:43, Vaibhav Gupta wrote:
> > The purpose of this patch series is to remove legacy power management callbacks
> > from realtek ethernet drivers.
> >
> > The callbacks performing suspend() and resume() operations are still calling
> > pci_save_state(), pci_set_power_state(), etc. and handling the powermanagement
> > themselves, which is not recommended.
> >
> Did you test any of the changes? If not, then mention this at least.
> A typical comment in the commit message would be "compile-tested only".
Yeah its compile-tested only. I should have mention that. Thanks for
pointing it out.
>
> In addition the following should be changed.
> [Linux-kernel-mentees] [PATCH v2 0/2]
> Use
> [PATCH net-next v2 0/2]
> instead.
Sure!

--Vaibhav Gupta
>
> > The conversion requires the removal of the those function calls and change the
> > callback definition accordingly.
> >
> > Vaibhav Gupta (2):
> >   realtek/8139too: Remove Legacy Power Management
> >   realtek/8139cp: Remove Legacy Power Management
> >
> >  drivers/net/ethernet/realtek/8139cp.c  | 25 +++++++------------------
> >  drivers/net/ethernet/realtek/8139too.c | 26 +++++++-------------------
> >  2 files changed, 14 insertions(+), 37 deletions(-)
> >
>
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Re: [Linux-kernel-mentees] [PATCH v2 0/2] realtek ethernet : remove legacy power management callbacks.

[Heiner Kallweit]

On 28.04.2020 16:43, Vaibhav Gupta wrote:
> The purpose of this patch series is to remove legacy power management callbacks
> from realtek ethernet drivers.
> 
> The callbacks performing suspend() and resume() operations are still calling
> pci_save_state(), pci_set_power_state(), etc. and handling the powermanagement
> themselves, which is not recommended.
> 
Did you test any of the changes? If not, then mention this at least.
A typical comment in the commit message would be "compile-tested only".

In addition the following should be changed.
[Linux-kernel-mentees] [PATCH v2 0/2]
Use
[PATCH net-next v2 0/2]
instead.

> The conversion requires the removal of the those function calls and change the
> callback definition accordingly.
> 
> Vaibhav Gupta (2):
>   realtek/8139too: Remove Legacy Power Management
>   realtek/8139cp: Remove Legacy Power Management
> 
>  drivers/net/ethernet/realtek/8139cp.c  | 25 +++++++------------------
>  drivers/net/ethernet/realtek/8139too.c | 26 +++++++-------------------
>  2 files changed, 14 insertions(+), 37 deletions(-)
> 

Re: [Linux-kernel-mentees] [PATCH v2 0/2] realtek ethernet : remove legacy power management callbacks.

[Heiner Kallweit]

On 28.04.2020 16:43, Vaibhav Gupta wrote:
> The purpose of this patch series is to remove legacy power management callbacks
> from realtek ethernet drivers.
> 
> The callbacks performing suspend() and resume() operations are still calling
> pci_save_state(), pci_set_power_state(), etc. and handling the powermanagement
> themselves, which is not recommended.
> 
Did you test any of the changes? If not, then mention this at least.
A typical comment in the commit message would be "compile-tested only".

In addition the following should be changed.
[Linux-kernel-mentees] [PATCH v2 0/2]
Use
[PATCH net-next v2 0/2]
instead.

> The conversion requires the removal of the those function calls and change the
> callback definition accordingly.
> 
> Vaibhav Gupta (2):
>   realtek/8139too: Remove Legacy Power Management
>   realtek/8139cp: Remove Legacy Power Management
> 
>  drivers/net/ethernet/realtek/8139cp.c  | 25 +++++++------------------
>  drivers/net/ethernet/realtek/8139too.c | 26 +++++++-------------------
>  2 files changed, 14 insertions(+), 37 deletions(-)
> 

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[Linux-kernel-mentees] [PATCH v2 0/2] realtek ethernet : remove legacy power management callbacks.

[Vaibhav Gupta]

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

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

The conversion requires the removal of the those function calls and change the
callback definition accordingly.

Vaibhav Gupta (2):
  realtek/8139too: Remove Legacy Power Management
  realtek/8139cp: Remove Legacy Power Management

 drivers/net/ethernet/realtek/8139cp.c  | 25 +++++++------------------
 drivers/net/ethernet/realtek/8139too.c | 26 +++++++-------------------
 2 files changed, 14 insertions(+), 37 deletions(-)

-- 
2.26.2

[Linux-kernel-mentees] [PATCH v2 0/2] realtek ethernet : remove legacy power management callbacks.

[Vaibhav Gupta]

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

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

The conversion requires the removal of the those function calls and change the
callback definition accordingly.

Vaibhav Gupta (2):
  realtek/8139too: Remove Legacy Power Management
  realtek/8139cp: Remove Legacy Power Management

 drivers/net/ethernet/realtek/8139cp.c  | 25 +++++++------------------
 drivers/net/ethernet/realtek/8139too.c | 26 +++++++-------------------
 2 files changed, 14 insertions(+), 37 deletions(-)

-- 
2.26.2

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