dmaengine: stm32-mdma: fix PM reference leak in stm32_mdma_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@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>

diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
index 36ba8b4..18cbd1e 100644 (file)
--- a/drivers/dma/stm32-mdma.c
+++ b/drivers/dma/stm32-mdma.c
@@ -1452,7 +1452,7 @@ static int stm32_mdma_alloc_chan_resources(struct dma_chan *c)
                return -ENOMEM;
        }
 
-       ret = pm_runtime_get_sync(dmadev->ddev.dev);
+       ret = pm_runtime_resume_and_get(dmadev->ddev.dev);
        if (ret < 0)
                return ret;
 
@@ -1718,7 +1718,7 @@ static int stm32_mdma_pm_suspend(struct device *dev)
        u32 ccr, id;
        int ret;
 
-       ret = pm_runtime_get_sync(dev);
+       ret = pm_runtime_resume_and_get(dev);
        if (ret < 0)
                return ret;