linux-kernel - [PATCH] arm: omap-iommu: fix return value check in _get

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Date:   Mon, 13 Jul 2020 02:45:27 +0000
From:   Xu Wang <vulab@...as.ac.cn>
To:     tony@...mide.com, linux@...linux.org.uk,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Xu Wang <vulab@...as.ac.cn>
Subject: [PATCH] arm: omap-iommu: fix return value check in _get_pwrdm()

In case of error, function of_clk_get() returns ERR_PTR()
and never returns NULL. The NULL test in the return value
check should be replaced with IS_ERR().

Signed-off-by: Xu Wang <vulab@...as.ac.cn>
---
 arch/arm/mach-omap2/omap-iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mach-omap2/omap-iommu.c b/arch/arm/mach-omap2/omap-iommu.c
index 54aff33e55e6..bfa5e1b8dba7 100644
--- a/arch/arm/mach-omap2/omap-iommu.c
+++ b/arch/arm/mach-omap2/omap-iommu.c
@@ -74,7 +74,7 @@ static struct powerdomain *_get_pwrdm(struct device *dev)
 		return pwrdm;
 
 	clk = of_clk_get(dev->of_node->parent, 0);
-	if (!clk) {
+	if (IS_ERR(clk)) {
 		dev_err(dev, "no fck found\n");
 		return NULL;
 	}
-- 
2.17.1