linux-kernel - [PATCH -next] spi: fsl-lpspi: Fix PM reference leak in lpspi_prepare_xfer

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Date:   Fri, 9 Apr 2021 09:54:30 +0000
From:   Wang Li <wangli74@...wei.com>
To:     <broonie@...nel.org>, <han.xu@....com>, <xiaoning.wang@....com>,
        <frank.li@....com>
CC:     <linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Wang Li <wangli74@...wei.com>
Subject: [PATCH -next] spi: fsl-lpspi: Fix PM reference leak in lpspi_prepare_xfer_hardware()

pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in reference leak here.
Fix it by replacing it with pm_runtime_resume_and_get to keep usage
counter balanced.

Fixes: 944c01a889d9 ("spi: lpspi: enable runtime pm for lpspi")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Wang Li <wangli74@...wei.com>
---
 drivers/spi/spi-fsl-lpspi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-lpspi.c b/drivers/spi/spi-fsl-lpspi.c
index a2886ee44e4c..5d98611dd999 100644
--- a/drivers/spi/spi-fsl-lpspi.c
+++ b/drivers/spi/spi-fsl-lpspi.c
@@ -200,7 +200,7 @@ static int lpspi_prepare_xfer_hardware(struct spi_controller *controller)
 				spi_controller_get_devdata(controller);
 	int ret;
 
-	ret = pm_runtime_get_sync(fsl_lpspi->dev);
+	ret = pm_runtime_resume_and_get(fsl_lpspi->dev);
 	if (ret < 0) {
 		dev_err(fsl_lpspi->dev, "failed to enable clock\n");
 		return ret;
-- 
2.17.1