linux-kernel - [PATCH 3.16 084/254] dmaengine: jz4740: disable/unprepare clk if probe fails

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Message-ID: <lsq.1519831218.216568476@decadent.org.uk>
Date:   Wed, 28 Feb 2018 15:20:18 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Vinod Koul" <vinod.koul@...el.com>,
        "Tobias Jordan" <Tobias.Jordan@...ktrobit.com>
Subject: [PATCH 3.16 084/254] dmaengine: jz4740: disable/unprepare clk if
 probe fails

3.16.55-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Tobias Jordan <Tobias.Jordan@...ktrobit.com>

commit eb9436966fdc84cebdf222952a99898ab46d9bb0 upstream.

in error path of jz4740_dma_probe(), call clk_disable_unprepare() to clean
up.

Found by Linux Driver Verification project (linuxtesting.org).

Fixes: 25ce6c35fea0 MIPS: jz4740: Remove custom DMA API
Signed-off-by: Tobias Jordan <Tobias.Jordan@...ktrobit.com>
Signed-off-by: Vinod Koul <vinod.koul@...el.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/dma/dma-jz4740.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/dma/dma-jz4740.c
+++ b/drivers/dma/dma-jz4740.c
@@ -574,7 +574,7 @@ static int jz4740_dma_probe(struct platf
 
 	ret = dma_async_device_register(dd);
 	if (ret)
-		return ret;
+		goto err_clk;
 
 	irq = platform_get_irq(pdev, 0);
 	ret = request_irq(irq, jz4740_dma_irq, 0, dev_name(&pdev->dev), dmadev);
@@ -587,6 +587,8 @@ static int jz4740_dma_probe(struct platf
 
 err_unregister:
 	dma_async_device_unregister(dd);
+err_clk:
+	clk_disable_unprepare(dmadev->clk);
 	return ret;
 }