linux-kernel - [PATCH AUTOSEL 5.4 4/7] dmaengine: ste_dma40: Fix PM disable depth imbalance in d40

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Message-Id: <20231018141525.1335533-4-sashal@kernel.org>
Date:   Wed, 18 Oct 2023 10:15:20 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Zhang Shurong <zhang_shurong@...mail.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, dmaengine@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 4/7] dmaengine: ste_dma40: Fix PM disable depth imbalance in d40_probe

From: Zhang Shurong <zhang_shurong@...mail.com>

[ Upstream commit 0618c077a8c20e8c81e367988f70f7e32bb5a717 ]

The pm_runtime_enable will increase power disable depth. Thus
a pairing decrement is needed on the error handling path to
keep it balanced according to context.
We fix it by calling pm_runtime_disable when error returns.

Signed-off-by: Zhang Shurong <zhang_shurong@...mail.com>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Link: https://lore.kernel.org/r/tencent_DD2D371DB5925B4B602B1E1D0A5FA88F1208@qq.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dma/ste_dma40.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 96a808b487cbe..fa0ad8581edcc 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -3700,6 +3700,7 @@ static int __init d40_probe(struct platform_device *pdev)
 		regulator_disable(base->lcpa_regulator);
 		regulator_put(base->lcpa_regulator);
 	}
+	pm_runtime_disable(base->dev);
 
 	kfree(base->lcla_pool.alloc_map);
 	kfree(base->lookup_log_chans);
-- 
2.40.1