linux-kernel - [PATCH 3/3] dmaengine: zynqmp_dma: Fix PM reference leak in zynqmp_dma_alloc_chan

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Date:   Mon, 17 May 2021 16:18:26 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <vkoul@...nel.org>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...s.st.com>, <michal.simek@...inx.com>
CC:     <dmaengine@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <yukuai3@...wei.com>,
        <yi.zhang@...wei.com>
Subject: [PATCH 3/3] dmaengine: zynqmp_dma: Fix PM reference leak in zynqmp_dma_alloc_chan_resourc()

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.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/dma/xilinx/zynqmp_dma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/xilinx/zynqmp_dma.c b/drivers/dma/xilinx/zynqmp_dma.c
index d8419565b92c..5fecf5aa6e85 100644
--- a/drivers/dma/xilinx/zynqmp_dma.c
+++ b/drivers/dma/xilinx/zynqmp_dma.c
@@ -468,7 +468,7 @@ static int zynqmp_dma_alloc_chan_resources(struct dma_chan *dchan)
 	struct zynqmp_dma_desc_sw *desc;
 	int i, ret;
 
-	ret = pm_runtime_get_sync(chan->dev);
+	ret = pm_runtime_resume_and_get(chan->dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.25.4