linux-kernel - [PATCH 4.17 65/66] can: m_can: Fix runtime resume call

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Message-Id: <20180727093816.339942023@linuxfoundation.org>
Date:   Fri, 27 Jul 2018 11:45:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Faiz Abbas <faiz_abbas@...com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Subject: [PATCH 4.17 65/66] can: m_can: Fix runtime resume call

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Faiz Abbas <faiz_abbas@...com>

commit 1675bee3e732c2449e792feed9caff804f3bd42c upstream.

pm_runtime_get_sync() returns a 1 if the state of the device is already
'active'. This is not a failure case and should return a success.

Therefore fix error handling for pm_runtime_get_sync() call such that
it returns success when the value is 1.

Also cleanup the TODO for using runtime PM for sleep mode as that is
implemented.

Signed-off-by: Faiz Abbas <faiz_abbas@...com>
Cc: <stable@...r.kernel.org
Signed-off-by: Marc Kleine-Budde <mkl@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/can/m_can/m_can.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/net/can/m_can/m_can.c
+++ b/drivers/net/can/m_can/m_can.c
@@ -634,10 +634,12 @@ static int m_can_clk_start(struct m_can_
 	int err;
 
 	err = pm_runtime_get_sync(priv->device);
-	if (err)
+	if (err < 0) {
 		pm_runtime_put_noidle(priv->device);
+		return err;
+	}
 
-	return err;
+	return 0;
 }
 
 static void m_can_clk_stop(struct m_can_priv *priv)
@@ -1687,8 +1689,6 @@ failed_ret:
 	return ret;
 }
 
-/* TODO: runtime PM with power down or sleep mode  */
-
 static __maybe_unused int m_can_suspend(struct device *dev)
 {
 	struct net_device *ndev = dev_get_drvdata(dev);