netdev - [PATCH] can: m_can: Fix runtime resume call

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Message-ID: <20180529132426.31216-1-faiz_abbas@ti.com>
Date:   Tue, 29 May 2018 18:54:26 +0530
From:   Faiz Abbas <faiz_abbas@...com>
To:     <linux-can@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
CC:     <mkl@...gutronix.de>, <wg@...ndegger.com>, <faiz_abbas@...com>
Subject: [PATCH] can: m_can: Fix runtime resume call

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

diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c
index a9fbf81ac3d4..04c48371ab2a 100644
--- 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_priv *priv)
 	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 @@ static int m_can_plat_probe(struct platform_device *pdev)
 	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);
-- 
2.17.0