linux-kernel - [PATCH] mfd: t7l66xb: Handle return value of clk_prepare

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Date:   Tue,  8 Aug 2017 15:24:56 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     lee.jones@...aro.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] mfd: t7l66xb: Handle return value of clk_prepare_enable

clk_prepare_enable() can fail here and we must check its return value.
we must disable clock, if t7l66xb_probe is not successful.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
---
 drivers/mfd/t7l66xb.c | 17 ++++++++++++++---
 1 file changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/mfd/t7l66xb.c b/drivers/mfd/t7l66xb.c
index 22c8113..43d8683 100644
--- a/drivers/mfd/t7l66xb.c
+++ b/drivers/mfd/t7l66xb.c
@@ -86,8 +86,11 @@ static int t7l66xb_mmc_enable(struct platform_device *mmc)
 	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 	unsigned long flags;
 	u8 dev_ctl;
+	int ret;
 
-	clk_prepare_enable(t7l66xb->clk32k);
+	ret = clk_prepare_enable(t7l66xb->clk32k);
+	if (ret)
+		return ret;
 
 	raw_spin_lock_irqsave(&t7l66xb->lock, flags);
 
@@ -286,8 +289,12 @@ static int t7l66xb_resume(struct platform_device *dev)
 {
 	struct t7l66xb *t7l66xb = platform_get_drvdata(dev);
 	struct t7l66xb_platform_data *pdata = dev_get_platdata(&dev->dev);
+	int ret;
+
+	ret = clk_prepare_enable(t7l66xb->clk48m);
+	if (ret)
+		return ret;
 
-	clk_prepare_enable(t7l66xb->clk48m);
 	if (pdata && pdata->resume)
 		pdata->resume(dev);
 
@@ -361,7 +368,9 @@ static int t7l66xb_probe(struct platform_device *dev)
 		goto err_ioremap;
 	}
 
-	clk_prepare_enable(t7l66xb->clk48m);
+	ret = clk_prepare_enable(t7l66xb->clk48m);
+	if (ret)
+		goto err_clk_enable;
 
 	if (pdata->enable)
 		pdata->enable(dev);
@@ -386,6 +395,8 @@ static int t7l66xb_probe(struct platform_device *dev)
 		return 0;
 
 	t7l66xb_detach_irq(dev);
+	clk_disable_unprepare(t7l66xb->clk48m);
+err_clk_enable:
 	iounmap(t7l66xb->scr);
 err_ioremap:
 	release_resource(&t7l66xb->rscr);
-- 
1.9.1