linux-kernel - [PATCH 2/8] usb: phy: omap-usb2: fix devm_ioremap

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Date:	Mon, 7 Jul 2014 12:18:19 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<gregkh@...uxfoundation.org>
CC:	<kishon@...com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/8] usb: phy: omap-usb2: fix devm_ioremap_resource error detection code

From: Himangi Saraogi <himangi774@...il.com>

devm_ioremap_resource returns an ERR_PTR value, not NULL, on failure.

A simplified version of the semantic match that finds this problem is as
follows:

// <smpl>
@@
expression e,e1;
statement S;
@@

*e = devm_ioremap_resource(...);
if (!e1) S

// </smpl>

Signed-off-by: Himangi Saraogi <himangi774@...il.com>
Acked-by: Julia Lawall <julia.lawall@...6.fr>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/phy/phy-omap-usb2.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/phy-omap-usb2.c b/drivers/phy/phy-omap-usb2.c
index 7007c11..2063d54 100644
--- a/drivers/phy/phy-omap-usb2.c
+++ b/drivers/phy/phy-omap-usb2.c
@@ -233,8 +233,8 @@ static int omap_usb2_probe(struct platform_device *pdev)
 	if (phy_data->flags & OMAP_USB2_CALIBRATE_FALSE_DISCONNECT) {
 		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 		phy->phy_base = devm_ioremap_resource(&pdev->dev, res);
-		if (!phy->phy_base)
-			return -ENOMEM;
+		if (IS_ERR(phy->phy_base))
+			return PTR_ERR(phy->phy_base);
 		phy->flags |= OMAP_USB2_CALIBRATE_FALSE_DISCONNECT;
 	}
 
-- 
1.7.9.5

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