linux-kernel - [PATCH AUTOSEL 5.4 10/13] dmaengine: shdma: Fix runtime PM imbalance on error

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Date:   Tue, 22 Feb 2022 21:31:14 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yongzhi Liu <lyz_cs@....edu.cn>, Vinod Koul <vkoul@...nel.org>,
        Sasha Levin <sashal@...nel.org>, christophe.jaillet@...adoo.fr,
        broonie@...nel.org, arnd@...db.de,
        laurent.pinchart@...asonboard.com, dmaengine@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 10/13] dmaengine: shdma: Fix runtime PM imbalance on error

From: Yongzhi Liu <lyz_cs@....edu.cn>

[ 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@....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@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 c51de498b5b4b..19eee3d0900b0 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);
 
-- 
2.34.1