[PATCH] dmaengine: shdma: Fix runtime PM imbalance on error

[刘永志]

pm_runtime_get_() increments the runtime PM usage counter even
when it returns an error code, thus a matching decrement is needed on
the error handling path to keep the counter balanced.

Signed-off-by: Yongzhi Liu <lyz_cs@xxxxxxxxxx>
---
 drivers/dma/sh/shdma-base.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c
index 158e5e7..b26ed69 100644
--- a/drivers/dma/sh/shdma-base.c
+++ b/drivers/dma/sh/shdma-base.c
@@ -115,8 +115,10 @@ static dma_cookie_t shdma_tx_submit(struct dma_async_tx_descriptor *tx)
 		ret = pm_runtime_get(schan->dev);
 
 		spin_unlock_irq(&schan->chan_lock);
-		if (ret < 0)
+		if (ret < 0) {
 			dev_err(schan->dev, "%s(): GET = %d\n", __func__, ret);
+			pm_runtime_put(schan->dev);
+		}
 
 		pm_runtime_barrier(schan->dev);
 
-- 
2.7.4