The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 1675bee3e732c2449e792feed9caff804f3bd42c Mon Sep 17 00:00:00 2001
From: Faiz Abbas faiz_abbas@ti.com Date: Tue, 3 Jul 2018 16:41:02 +0530 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@ti.com Cc: <stable@vger.kernel.org Signed-off-by: Marc Kleine-Budde mkl@pengutronix.de
diff --git a/drivers/net/can/m_can/m_can.c b/drivers/net/can/m_can/m_can.c index 8e2b7f873c4d..e2f965c2e3aa 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) @@ -1688,8 +1690,6 @@ 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);