linux-kernel - [PATCH] dma/mediatek-hs/probe: Fixed a memory leak when devm_request

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Message-Id: <20191024044320.1097-1-sst2005@gmail.com>
Date:   Thu, 24 Oct 2019 10:13:19 +0530
From:   Satendra Singh Thakur <sst2005@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Satendra Singh Thakur <sst2005@...il.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Vinod Koul <vkoul@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] dma/mediatek-hs/probe: Fixed a memory leak when devm_request_irq fails

When devm_request_irq fails, currently, the function
dma_async_device_unregister gets called. This doesn't free
the resources allocated by of_dma_controller_register.
Therefore, we have called of_dma_controller_free for this purpose.

Signed-off-by: Satendra Singh Thakur <sst2005@...il.com>
---
 drivers/dma/mediatek/mtk-hsdma.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/mediatek/mtk-hsdma.c b/drivers/dma/mediatek/mtk-hsdma.c
index 1a2028e1c29e..4c58da742143 100644
--- a/drivers/dma/mediatek/mtk-hsdma.c
+++ b/drivers/dma/mediatek/mtk-hsdma.c
@@ -997,7 +997,7 @@ static int mtk_hsdma_probe(struct platform_device *pdev)
 	if (err) {
 		dev_err(&pdev->dev,
 			"request_irq failed with err %d\n", err);
-		goto err_unregister;
+		goto err_free;
 	}
 
 	platform_set_drvdata(pdev, hsdma);
@@ -1006,6 +1006,8 @@ static int mtk_hsdma_probe(struct platform_device *pdev)
 
 	return 0;
 
+err_free:
+	of_dma_controller_free(pdev->dev.of_node);
 err_unregister:
 	dma_async_device_unregister(dd);
 
-- 
2.17.1