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[02/10] watchdog: rzg2l_wdt: Use pm_runtime_resume_and_get()

Message ID 20240122111115.2861835-3-claudiu.beznea.uj@bp.renesas.com (mailing list archive)
State Superseded
Delegated to: Geert Uytterhoeven
Headers show
Series watchdog: rzg2l_wdt: Add support for RZ/G3S | expand

Commit Message

Claudiu Jan. 22, 2024, 11:11 a.m. UTC 
From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

pm_runtime_get_sync() may return with error. In case it returns with error
dev->power.usage_count needs to be decremented. pm_runtime_resume_and_get()
takes care of this. Thus use it.

Fixes: 2cbc5cd0b55f ("watchdog: Add Watchdog Timer driver for RZ/G2L")
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
---
 drivers/watchdog/rzg2l_wdt.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Comments

Geert Uytterhoeven Jan. 30, 2024, 4:43 p.m. UTC | #1 
Hi Claudiu,

On Mon, Jan 22, 2024 at 12:11 PM Claudiu <claudiu.beznea@tuxon.dev> wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
>
> pm_runtime_get_sync() may return with error. In case it returns with error
> dev->power.usage_count needs to be decremented. pm_runtime_resume_and_get()
> takes care of this. Thus use it.
>
> Fixes: 2cbc5cd0b55f ("watchdog: Add Watchdog Timer driver for RZ/G2L")
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>

Thanks for your patch!

> --- a/drivers/watchdog/rzg2l_wdt.c
> +++ b/drivers/watchdog/rzg2l_wdt.c
> @@ -123,8 +123,11 @@ static void rzg2l_wdt_init_timeout(struct watchdog_device *wdev)
>  static int rzg2l_wdt_start(struct watchdog_device *wdev)
>  {
>         struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
> +       int ret;
>
> -       pm_runtime_get_sync(wdev->parent);
> +       ret = pm_runtime_resume_and_get(wdev->parent);
> +       if (ret)
> +               return ret;
>
>         /* Initialize time out */
>         rzg2l_wdt_init_timeout(wdev);

To actually handle this error condition, rzg2l_wdt_set_timeout() should
be updated to propagate the error to its caller, too.

Anyway, most of this is moot, as pm_runtime_get_sync() won't ever
fail on Renesas arm/risc-v systems...

Gr{oetje,eeting}s,

                        Geert
diff mbox series

Patch

diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c
index 1741f98ca67c..4ab9e7c5e771 100644
--- a/drivers/watchdog/rzg2l_wdt.c
+++ b/drivers/watchdog/rzg2l_wdt.c
@@ -123,8 +123,11 @@  static void rzg2l_wdt_init_timeout(struct watchdog_device *wdev)
 static int rzg2l_wdt_start(struct watchdog_device *wdev)
 {
 	struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
+	int ret;
 
-	pm_runtime_get_sync(wdev->parent);
+	ret = pm_runtime_resume_and_get(wdev->parent);
+	if (ret)
+		return ret;
 
 	/* Initialize time out */
 	rzg2l_wdt_init_timeout(wdev);