linux-kernel - [PATCH 4.9 131/167] video: fbdev: pxa3xx-gcu: release the resources correctly in pxa3xx_gcu

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Message-Id: <20220613094911.620869381@linuxfoundation.org>
Date:   Mon, 13 Jun 2022 12:10:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yang Yingliang <yangyingliang@...wei.com>,
        Helge Deller <deller@....de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 131/167] video: fbdev: pxa3xx-gcu: release the resources correctly in pxa3xx_gcu_probe/remove()

From: Yang Yingliang <yangyingliang@...wei.com>

[ Upstream commit d87ad457f7e1b8d2492ca5b1531eb35030a1cc8f ]

In pxa3xx_gcu_probe(), the sequence of error lable is wrong, it will
leads some resource leaked, so adjust the sequence to handle the error
correctly, and if pxa3xx_gcu_add_buffer() fails, pxa3xx_gcu_free_buffers()
need be called.
In pxa3xx_gcu_remove(), add missing clk_disable_unpreprare().

Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
Signed-off-by: Helge Deller <deller@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/video/fbdev/pxa3xx-gcu.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/video/fbdev/pxa3xx-gcu.c b/drivers/video/fbdev/pxa3xx-gcu.c
index 50bce45e7f3d..184773b6b9e4 100644
--- a/drivers/video/fbdev/pxa3xx-gcu.c
+++ b/drivers/video/fbdev/pxa3xx-gcu.c
@@ -662,6 +662,7 @@ static int pxa3xx_gcu_probe(struct platform_device *pdev)
 	for (i = 0; i < 8; i++) {
 		ret = pxa3xx_gcu_add_buffer(dev, priv);
 		if (ret) {
+			pxa3xx_gcu_free_buffers(dev, priv);
 			dev_err(dev, "failed to allocate DMA memory\n");
 			goto err_disable_clk;
 		}
@@ -677,15 +678,15 @@ static int pxa3xx_gcu_probe(struct platform_device *pdev)
 			SHARED_SIZE, irq);
 	return 0;
 
-err_free_dma:
-	dma_free_coherent(dev, SHARED_SIZE,
-			priv->shared, priv->shared_phys);
+err_disable_clk:
+	clk_disable_unprepare(priv->clk);
 
 err_misc_deregister:
 	misc_deregister(&priv->misc_dev);
 
-err_disable_clk:
-	clk_disable_unprepare(priv->clk);
+err_free_dma:
+	dma_free_coherent(dev, SHARED_SIZE,
+			  priv->shared, priv->shared_phys);
 
 	return ret;
 }
@@ -698,6 +699,7 @@ static int pxa3xx_gcu_remove(struct platform_device *pdev)
 	pxa3xx_gcu_wait_idle(priv);
 	misc_deregister(&priv->misc_dev);
 	dma_free_coherent(dev, SHARED_SIZE, priv->shared, priv->shared_phys);
+	clk_disable_unprepare(priv->clk);
 	pxa3xx_gcu_free_buffers(dev, priv);
 
 	return 0;
-- 
2.35.1