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dmaengine: stm32-mdma: fix PM reference leak in stm32_mdma_alloc_chan_resourc()

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[ Upstream commit 83eb4868d325b86e18509d0874e911497667cb54 ]

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@huawei.com>
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Link: https://lore.kernel.org/r/20210517081826.1564698-2-yukuai3@huawei.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yu Kuai
2021-05-17 16:18:24 +08:00
committed by Sasha Levin
parent 86f3e72dcb
commit 13b245a7bd
1 changed files with 2 additions and 2 deletions
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4
drivers/dma/stm32-mdma.c
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@@ -1448,7 +1448,7 @@ static int stm32_mdma_alloc_chan_resources(struct dma_chan *c)
return -ENOMEM; return -ENOMEM;
} }
ret = pm_runtime_get_sync(dmadev->ddev.dev); ret = pm_runtime_resume_and_get(dmadev->ddev.dev);
if (ret < 0) if (ret < 0)
return ret; return ret;
@@ -1714,7 +1714,7 @@ static int stm32_mdma_pm_suspend(struct device *dev)
u32 ccr, id; u32 ccr, id;
int ret; int ret;
ret = pm_runtime_get_sync(dev); ret = pm_runtime_resume_and_get(dev);
if (ret < 0) if (ret < 0)
return ret; return ret;