linux-kernel - [PATCH v1] rtl818x_pci: use generic power management

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Message-Id: <20200623094454.12427-1-vaibhavgupta40@gmail.com>
Date:   Tue, 23 Jun 2020 15:14:55 +0530
From:   Vaibhav Gupta <vaibhavgupta40@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, bjorn@...gaas.com,
        Vaibhav Gupta <vaibhav.varodek@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Kalle Valo <kvalo@...eaurora.org>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Vaibhav Gupta <vaibhavgupta40@...il.com>,
        skhan@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        netdev@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: [PATCH v1] rtl818x_pci: use generic power management

Earlier, drivers had to manage the device's power states, and related
operations, themselves. With the generic approach, these are done by PCI
core.

The only driver-specific jobs, .suspend() and .resume() doing were invoking
PCI helper functions pci_save/restore_state() and
pci_set_power_state(). This is not recommeneded as PCI core takes care of
that. Hence they became empty-body functions, thus define them NULL.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>
---
 .../wireless/realtek/rtl818x/rtl8180/dev.c    | 23 ++++---------------
 1 file changed, 4 insertions(+), 19 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c b/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
index d5f65372356b..ba3286f732cc 100644
--- a/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
+++ b/drivers/net/wireless/realtek/rtl818x/rtl8180/dev.c
@@ -1966,32 +1966,17 @@ static void rtl8180_remove(struct pci_dev *pdev)
 	ieee80211_free_hw(dev);
 }
 
-#ifdef CONFIG_PM
-static int rtl8180_suspend(struct pci_dev *pdev, pm_message_t state)
-{
-	pci_save_state(pdev);
-	pci_set_power_state(pdev, pci_choose_state(pdev, state));
-	return 0;
-}
-
-static int rtl8180_resume(struct pci_dev *pdev)
-{
-	pci_set_power_state(pdev, PCI_D0);
-	pci_restore_state(pdev);
-	return 0;
-}
+#define rtl8180_suspend NULL
+#define rtl8180_resume NULL
 
-#endif /* CONFIG_PM */
+static SIMPLE_DEV_PM_OPS(rtl8180_pm_ops, rtl8180_suspend, rtl8180_resume);
 
 static struct pci_driver rtl8180_driver = {
 	.name		= KBUILD_MODNAME,
 	.id_table	= rtl8180_table,
 	.probe		= rtl8180_probe,
 	.remove		= rtl8180_remove,
-#ifdef CONFIG_PM
-	.suspend	= rtl8180_suspend,
-	.resume		= rtl8180_resume,
-#endif /* CONFIG_PM */
+	.driver.pm	= &rtl8180_pm_ops,
 };
 
 module_pci_driver(rtl8180_driver);
-- 
2.27.0