linux-kernel - [PATCH] uio: uio_dmem_genirq: Remove dummy PM handling

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Message-ID: <121921f66a2baa125ea62be9436e8b5b12a4ad4d.1756999182.git.geert+renesas@glider.be>
Date: Thu,  4 Sep 2025 17:20:44 +0200
From: Geert Uytterhoeven <geert+renesas@...der.be>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-pm@...r.kernel.org,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] uio: uio_dmem_genirq: Remove dummy PM handling

Since commit 63d00be69348fda4 ("PM: runtime: Allow unassigned
->runtime_suspend|resume callbacks"), unassigned
.runtime_{suspend,resume}() callbacks are treated the same as dummy
callbacks that just return zero.

As the Runtime PM callbacks were the only driver-specific PM handling,
all PM handling can be removed.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Compile-tested only.
---
 drivers/uio/uio_dmem_genirq.c | 23 -----------------------
 1 file changed, 23 deletions(-)

diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c
index 31aa75110ba5916a..41c18ec62a4530ac 100644
--- a/drivers/uio/uio_dmem_genirq.c
+++ b/drivers/uio/uio_dmem_genirq.c
@@ -297,28 +297,6 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev)
 	return devm_uio_register_device(&pdev->dev, priv->uioinfo);
 }
 
-static int uio_dmem_genirq_runtime_nop(struct device *dev)
-{
-	/* Runtime PM callback shared between ->runtime_suspend()
-	 * and ->runtime_resume(). Simply returns success.
-	 *
-	 * In this driver pm_runtime_get_sync() and pm_runtime_put_sync()
-	 * are used at open() and release() time. This allows the
-	 * Runtime PM code to turn off power to the device while the
-	 * device is unused, ie before open() and after release().
-	 *
-	 * This Runtime PM callback does not need to save or restore
-	 * any registers since user space is responsbile for hardware
-	 * register reinitialization after open().
-	 */
-	return 0;
-}
-
-static const struct dev_pm_ops uio_dmem_genirq_dev_pm_ops = {
-	.runtime_suspend = uio_dmem_genirq_runtime_nop,
-	.runtime_resume = uio_dmem_genirq_runtime_nop,
-};
-
 #ifdef CONFIG_OF
 static const struct of_device_id uio_of_genirq_match[] = {
 	{ /* empty for now */ },
@@ -330,7 +308,6 @@ static struct platform_driver uio_dmem_genirq = {
 	.probe = uio_dmem_genirq_probe,
 	.driver = {
 		.name = DRIVER_NAME,
-		.pm = &uio_dmem_genirq_dev_pm_ops,
 		.of_match_table = of_match_ptr(uio_of_genirq_match),
 	},
 };
-- 
2.43.0