linux-kernel - [PATCH] dma/ste_dma40: Fixup clock usage during probe

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Date:	Thu, 23 Aug 2012 13:41:58 +0200
From:	Ulf Hansson <ulf.hansson@...ricsson.com>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	<linux-kernel@...r.kernel.org>,
	Dan Williams <dan.j.williams@...el.com>,
	Lee Jones <lee.jones@...aro.org>,
	Srinidhi Kasagar <srinidhi.kasagar@...ricsson.com>,
	Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH] dma/ste_dma40: Fixup clock usage during probe

From: Ulf Hansson <ulf.hansson@...aro.org>

Fixup some errorhandling for clocks during probe and make sure
to use clk_prepare as well as clk_enable.

Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/dma/ste_dma40.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
index 000d309..826d0d5 100644
--- a/drivers/dma/ste_dma40.c
+++ b/drivers/dma/ste_dma40.c
@@ -2920,19 +2920,23 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
 	struct d40_base *base = NULL;
 	int num_log_chans = 0;
 	int num_phy_chans;
+	int clk_ret = -EINVAL;
 	int i;
 	u32 pid;
 	u32 cid;
 	u8 rev;
 
 	clk = clk_get(&pdev->dev, NULL);
-
 	if (IS_ERR(clk)) {
 		d40_err(&pdev->dev, "No matching clock found\n");
 		goto failure;
 	}
 
-	clk_enable(clk);
+	clk_ret = clk_prepare_enable(clk);
+	if (clk_ret) {
+		d40_err(&pdev->dev, "Failed to prepare/enable clock\n");
+		goto failure;
+	}
 
 	/* Get IO for DMAC base address */
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base");
@@ -3062,10 +3066,10 @@ static struct d40_base * __init d40_hw_detect_init(struct platform_device *pdev)
 	return base;
 
 failure:
-	if (!IS_ERR(clk)) {
-		clk_disable(clk);
+	if (!clk_ret)
+		clk_disable_unprepare(clk);
+	if (!IS_ERR(clk))
 		clk_put(clk);
-	}
 	if (virtbase)
 		iounmap(virtbase);
 	if (res)
-- 
1.7.10

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