linux-kernel - [PATCH 2/5] clocksource: timer-stm32-lp: Mark driver as non-removable

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Date:   Mon, 13 Mar 2023 08:54:27 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
Cc:     linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 2/5] clocksource: timer-stm32-lp: Mark driver as non-removable

The comment in the remove callback suggests that the driver is not
supposed to be unbound. However returning an error code in the remove
callback doesn't accomplish that. Instead set the suppress_bind_attrs
property (which makes it impossible to unbind the driver via sysfs).
The only remaining way to unbind an stm32-lp device would be module
unloading, but that doesn't apply here, as the driver cannot be built as
a module.

Also drop the useless remove callback.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/clocksource/timer-stm32-lp.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/drivers/clocksource/timer-stm32-lp.c b/drivers/clocksource/timer-stm32-lp.c
index db2841d0beb8..616ea4fe4234 100644
--- a/drivers/clocksource/timer-stm32-lp.c
+++ b/drivers/clocksource/timer-stm32-lp.c
@@ -195,11 +195,6 @@ static int stm32_clkevent_lp_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static int stm32_clkevent_lp_remove(struct platform_device *pdev)
-{
-	return -EBUSY; /* cannot unregister clockevent */
-}
-
 static const struct of_device_id stm32_clkevent_lp_of_match[] = {
 	{ .compatible = "st,stm32-lptimer-timer", },
 	{},
@@ -207,11 +202,11 @@ static const struct of_device_id stm32_clkevent_lp_of_match[] = {
 MODULE_DEVICE_TABLE(of, stm32_clkevent_lp_of_match);
 
 static struct platform_driver stm32_clkevent_lp_driver = {
-	.probe	= stm32_clkevent_lp_probe,
 	.remove = stm32_clkevent_lp_remove,
 	.driver	= {
 		.name = "stm32-lptimer-timer",
 		.of_match_table = of_match_ptr(stm32_clkevent_lp_of_match),
+		.suppress_bind_attrs = true,
 	},
 };
 module_platform_driver(stm32_clkevent_lp_driver);
-- 
2.39.1