Re: [Linux-kernel-mentees] [PATCH v1 1/2] realtek/8139too: Remove Legacy Power Management

[Bjorn Helgaas <helgaas@kernel.org>]

If you post more that one patch in a series, it's best if you include
a cover letter with the patches being responses to the cover letter.
In this case, it would be:

  [0/2] cover letter
  -> [1/2] realtek/8139too: Remove ...
  -> [2/2] realtek/8139cp: Remove ...

On Thu, Apr 23, 2020 at 06:57:59PM +0530, Vaibhav Gupta wrote:
> 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 .
> 
> 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..b7c98b165256 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 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 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);

The common pattern here seems to be:

  #ifdef CONFIG_PM_SLEEP
  static int *_suspend(struct device *device) { ... }
  static int *_resume(struct device *device) { ... }
  #endif
  static SIMPLE_DEV_PM_OPS(*_pm_ops, *_suspend, *_resume);

So your patch looks great except that I think you should keep the
#ifdef and convert it to CONFIG_PM_SLEEP.

>  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
> 
_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees