netdev - [PATCH v2 3/4] rts5208/rtsx.c: use generic power management

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200629173459.262075-4-vaibhavgupta40@gmail.com>
Date:   Mon, 29 Jun 2020 23:04:58 +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>,
        Manish Chopra <manishc@...vell.com>,
        GR-Linux-NIC-Dev@...vell.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Vaibhav Gupta <vaibhavgupta40@...il.com>, netdev@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        skhan@...uxfoundation.org
Subject: [PATCH v2 3/4] rts5208/rtsx.c: use generic power management

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 like
pci_save/restore_state(), pci_enable/disable_device(), etc.

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

The driver was also using pci_enable_wake(...,..., 0) to disable wake. Use
device_wakeup_disable() instead.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>
---
 drivers/staging/rts5208/rtsx.c | 30 ++++++++----------------------
 1 file changed, 8 insertions(+), 22 deletions(-)

diff --git a/drivers/staging/rts5208/rtsx.c b/drivers/staging/rts5208/rtsx.c
index be0053c795b7..6ca90694db8b 100644
--- a/drivers/staging/rts5208/rtsx.c
+++ b/drivers/staging/rts5208/rtsx.c
@@ -258,12 +258,12 @@ static int rtsx_acquire_irq(struct rtsx_dev *dev)
 	return 0;
 }
 
-#ifdef CONFIG_PM
 /*
  * power management
  */
-static int rtsx_suspend(struct pci_dev *pci, pm_message_t state)
+static int __maybe_unused rtsx_suspend(struct device *dev_d)
 {
+	struct pci_dev *pci = to_pci_dev(dev_d);
 	struct rtsx_dev *dev = pci_get_drvdata(pci);
 	struct rtsx_chip *chip;
 
@@ -285,10 +285,7 @@ static int rtsx_suspend(struct pci_dev *pci, pm_message_t state)
 	if (chip->msi_en)
 		pci_disable_msi(pci);
 
-	pci_save_state(pci);
-	pci_enable_wake(pci, pci_choose_state(pci, state), 1);
-	pci_disable_device(pci);
-	pci_set_power_state(pci, pci_choose_state(pci, state));
+	device_wakeup_enable(dev_d);
 
 	/* unlock the device pointers */
 	mutex_unlock(&dev->dev_mutex);
@@ -296,8 +293,9 @@ static int rtsx_suspend(struct pci_dev *pci, pm_message_t state)
 	return 0;
 }
 
-static int rtsx_resume(struct pci_dev *pci)
+static int __maybe_unused rtsx_resume(struct device *dev_d)
 {
+	struct pci_dev *pci = to_pci_dev(dev_d);
 	struct rtsx_dev *dev = pci_get_drvdata(pci);
 	struct rtsx_chip *chip;
 
@@ -309,16 +307,6 @@ static int rtsx_resume(struct pci_dev *pci)
 	/* lock the device pointers */
 	mutex_lock(&dev->dev_mutex);
 
-	pci_set_power_state(pci, PCI_D0);
-	pci_restore_state(pci);
-	if (pci_enable_device(pci) < 0) {
-		dev_err(&dev->pci->dev,
-			"%s: pci_enable_device failed, disabling device\n",
-			CR_DRIVER_NAME);
-		/* unlock the device pointers */
-		mutex_unlock(&dev->dev_mutex);
-		return -EIO;
-	}
 	pci_set_master(pci);
 
 	if (chip->msi_en) {
@@ -340,7 +328,6 @@ static int rtsx_resume(struct pci_dev *pci)
 
 	return 0;
 }
-#endif /* CONFIG_PM */
 
 static void rtsx_shutdown(struct pci_dev *pci)
 {
@@ -999,16 +986,15 @@ static const struct pci_device_id rtsx_ids[] = {
 
 MODULE_DEVICE_TABLE(pci, rtsx_ids);
 
+static SIMPLE_DEV_PM_OPS(rtsx_pm_ops, rtsx_suspend, rtsx_resume);
+
 /* pci_driver definition */
 static struct pci_driver rtsx_driver = {
 	.name = CR_DRIVER_NAME,
 	.id_table = rtsx_ids,
 	.probe = rtsx_probe,
 	.remove = rtsx_remove,
-#ifdef CONFIG_PM
-	.suspend = rtsx_suspend,
-	.resume = rtsx_resume,
-#endif
+	.driver.pm = &rtsx_pm_ops,
 	.shutdown = rtsx_shutdown,
 };
 
-- 
2.27.0