linux-kernel - [PATCH 1/5] spi: lpspi: fix the imbalance of runtime pm function call

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Date:   Tue, 14 Jul 2020 15:52:47 +0800
From:   Clark Wang <xiaoning.wang@....com>
To:     broonie@...nel.org
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] spi: lpspi: fix the imbalance of runtime pm function call

Call the put function after probe successfully. Otherwise, the lpspi
module will keep active status until the first spi transfer called.

Disable runtime pm when probe fails. There is no need to active runtime
pm after probe failed.

Signed-off-by: Clark Wang <xiaoning.wang@....com>
---
 drivers/spi/spi-fsl-lpspi.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index 1552b28b9515..a1555bbc5e5a 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -954,10 +954,15 @@ static int fsl_lpspi_probe(struct platform_device *pdev)
 	if (ret < 0)
 		dev_err(&pdev->dev, "dma setup error %d, use pio\n", ret);
 
+	pm_runtime_mark_last_busy(fsl_lpspi->dev);
+	pm_runtime_put_autosuspend(fsl_lpspi->dev);
+
 	return 0;
 
 out_pm_get:
-	pm_runtime_put_noidle(fsl_lpspi->dev);
+	pm_runtime_dont_use_autosuspend(fsl_lpspi->dev);
+	pm_runtime_put_sync(fsl_lpspi->dev);
+	pm_runtime_disable(fsl_lpspi->dev);
 out_controller_put:
 	spi_controller_put(controller);
 
-- 
2.17.1