netdev - [PATCH] can: flexcan: avoid unbalanced pm_runtime

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Date:   Tue, 13 Dec 2022 17:43:51 +0800
From:   haibo.chen@....com
To:     wg@...ndegger.com, mkl@...gutronix.de
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-imx@....com, haibo.chen@....com
Subject: [PATCH] can: flexcan: avoid unbalanced pm_runtime_enable warning

From: Haibo Chen <haibo.chen@....com>

When do suspend/resume, meet the following warning message:
[   30.028336] flexcan 425b0000.can: Unbalanced pm_runtime_enable!

Balance the pm_runtime_force_suspend() and pm_runtime_force_resume().

Fixes: 8cb53b485f18 ("can: flexcan: add auto stop mode for IMX93 to support wakeup")
Signed-off-by: Haibo Chen <haibo.chen@....com>
---
 drivers/net/can/flexcan/flexcan-core.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/net/can/flexcan/flexcan-core.c b/drivers/net/can/flexcan/flexcan-core.c
index 0aeff34e5ae1..6d638c93977b 100644
--- a/drivers/net/can/flexcan/flexcan-core.c
+++ b/drivers/net/can/flexcan/flexcan-core.c
@@ -2349,9 +2349,15 @@ static int __maybe_unused flexcan_noirq_resume(struct device *device)
 	if (netif_running(dev)) {
 		int err;
 
-		err = pm_runtime_force_resume(device);
-		if (err)
-			return err;
+		/* For the wakeup in auto stop mode, no need to gate on the
+		 * clock here, hardware will do this automatically.
+		 */
+		if (!(device_may_wakeup(device) &&
+		      priv->devtype_data.quirks & FLEXCAN_QUIRK_AUTO_STOP_MODE)) {
+			err = pm_runtime_force_resume(device);
+			if (err)
+				return err;
+		}
 
 		if (device_may_wakeup(device))
 			flexcan_enable_wakeup_irq(priv, false);
-- 
2.34.1