linux-kernel - [PATCH V2] dmaengine: usb-dmac: Fix PM reference leak in usb_dmac

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Date:   Tue, 6 Jul 2021 20:45:21 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <vkoul@...nel.org>, <yukuai3@...wei.com>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yi.zhang@...wei.com>
Subject: [PATCH V2] dmaengine: usb-dmac: Fix PM reference leak in usb_dmac_probe()

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 moving the error_pm label above the pm_runtime_put() in
the error path.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
changes in V2:
 - As suggested by Johan, instead of using pm_runtime_resume_and_get,
moving the 'error_pm' label above the pm_runtime_put() in the error path.

 drivers/dma/sh/usb-dmac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/sh/usb-dmac.c b/drivers/dma/sh/usb-dmac.c
index 8f7ceb698226..1cc06900153e 100644
--- a/drivers/dma/sh/usb-dmac.c
+++ b/drivers/dma/sh/usb-dmac.c
@@ -855,8 +855,8 @@ static int usb_dmac_probe(struct platform_device *pdev)
 
 error:
 	of_dma_controller_free(pdev->dev.of_node);
-	pm_runtime_put(&pdev->dev);
 error_pm:
+	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	return ret;
 }
-- 
2.31.1