[PATCH] dmaengine: stm32-mdma: call pm_runtime_put if pm_runtime_get_sync fails

[Navid Emamdoost]

Calling pm_runtime_get_sync increments the counter even in case of
failure, causing incorrect ref count. Call pm_runtime_put if
pm_runtime_get_sync fails.

Signed-off-by: Navid Emamdoost <navid.emamdo...@gmail.com>
---
 drivers/dma/stm32-mdma.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
index 5469563703d1..79bee1bb73f6 100644
--- a/drivers/dma/stm32-mdma.c
+++ b/drivers/dma/stm32-mdma.c
@@ -1449,8 +1449,10 @@ static int stm32_mdma_alloc_chan_resources(struct 
dma_chan *c)
        }
 
        ret = pm_runtime_get_sync(dmadev->ddev.dev);
-       if (ret < 0)
+       if (ret < 0) {
+               pm_runtime_put(dmadev->ddev.dev);
                return ret;
+       }
 
        ret = stm32_mdma_disable_chan(chan);
        if (ret < 0)
@@ -1718,8 +1720,10 @@ static int stm32_mdma_pm_suspend(struct device *dev)
        int ret;
 
        ret = pm_runtime_get_sync(dev);
-       if (ret < 0)
+       if (ret < 0) {
+               pm_runtime_put_sync(dev);
                return ret;
+       }
 
        for (id = 0; id < dmadev->nr_channels; id++) {
                ccr = stm32_mdma_read(dmadev, STM32_MDMA_CCR(id));
-- 
2.17.1