dmaengine: shdma: Fix runtime PM imbalance on error

[ Upstream commit 455896c53d5b803733ddd84e1bf8a430644439b6 ]

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@pku.edu.cn>
Link: https://lore.kernel.org/r/1642311296-87020-1-git-send-email-lyz_cs@pku.edu.cn
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c
index 7f72b3f..19ac95c 100644 (file)
--- 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);