linux-kernel - [PATCH v2 2/3] rsxx: use generic power management

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Date:   Mon, 20 Jul 2020 19:00:01 +0530
From:   Vaibhav Gupta <vaibhavgupta40@...il.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Bjorn Helgaas <bjorn@...gaas.com>,
        Vaibhav Gupta <vaibhav.varodek@...il.com>,
        Jens Axboe <axboe@...nel.dk>,
        Joshua Morris <josh.h.morris@...ibm.com>,
        Philip Kelleher <pjk1939@...ux.ibm.com>,
        Damien Le Moal <Damien.LeMoal@....com>
Cc:     Vaibhav Gupta <vaibhavgupta40@...il.com>,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: [PATCH v2 2/3] rsxx: use generic power management

Drivers using legacy PM have to manage PCI states and device's PM states
themselves. They also need to take care of configuration registers.

With improved and powerful support of generic PM, PCI Core takes care of
above mentioned, device-independent, jobs.

This driver has not defined .resume(), hence define it as NULL.

Change function parameter in both .suspend() to "struct device*" type and
mark the parameter as "__attribute__((unused)) " as the function body is
empty.

Compile-tested only.

Signed-off-by: Vaibhav Gupta <vaibhavgupta40@...il.com>
---
 drivers/block/rsxx/core.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/block/rsxx/core.c b/drivers/block/rsxx/core.c
index 10f6368117d8..866153fd380a 100644
--- a/drivers/block/rsxx/core.c
+++ b/drivers/block/rsxx/core.c
@@ -1030,12 +1030,15 @@ static void rsxx_pci_remove(struct pci_dev *dev)
 	kfree(card);
 }
 
-static int rsxx_pci_suspend(struct pci_dev *dev, pm_message_t state)
+static int __maybe_unused rsxx_pci_suspend(
+	__attribute__((unused)) struct device *dev)
 {
 	/* We don't support suspend at this time. */
 	return -ENOSYS;
 }
 
+#define rsxx_pci_resume NULL
+
 static void rsxx_pci_shutdown(struct pci_dev *dev)
 {
 	struct rsxx_cardinfo *card = pci_get_drvdata(dev);
@@ -1071,12 +1074,14 @@ static const struct pci_device_id rsxx_pci_ids[] = {
 
 MODULE_DEVICE_TABLE(pci, rsxx_pci_ids);
 
+static SIMPLE_DEV_PM_OPS(rsxx_pci_pm_ops, rsxx_pci_suspend, rsxx_pci_resume);
+
 static struct pci_driver rsxx_pci_driver = {
 	.name		= DRIVER_NAME,
 	.id_table	= rsxx_pci_ids,
 	.probe		= rsxx_pci_probe,
 	.remove		= rsxx_pci_remove,
-	.suspend	= rsxx_pci_suspend,
+	.driver.pm	= &rsxx_pci_pm_ops,
 	.shutdown	= rsxx_pci_shutdown,
 	.err_handler    = &rsxx_err_handler,
 };
-- 
2.27.0