linux-kernel - [PATCH] pinctrl: imx: fix unsigned check if nfuncs with less than or equal zero

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Date:   Mon, 26 Feb 2018 12:04:18 +0000
From:   Colin King <colin.king@...onical.com>
To:     Dong Aisheng <aisheng.dong@....com>,
        Fabio Estevam <festevam@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Stefan Agner <stefan@...er.ch>,
        inus Walleij <linus.walleij@...aro.org>,
        linux-gpio@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] pinctrl: imx: fix unsigned check if nfuncs with less than or equal zero

From: Colin Ian King <colin.king@...onical.com>

The unsigned integer nfuncs is being error checked with a value less
or equal to zero; this is always false if of_get_child_count returns
a -ve for an error condition since nfuncs is not signed. Fix this by
making variables nfuncs and i signed integers.

Detected with Coccinelle:
drivers/pinctrl/freescale/pinctrl-imx.c:620:6-12: WARNING: Unsigned
expression compared with zero: nfuncs <= 0

Fixes: ae75ff814538 ("pinctrl: pinctrl-imx: add imx pinctrl core driver")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/pinctrl/freescale/pinctrl-imx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
index 24aaddd760a0..1e8ca83352d0 100644
--- a/drivers/pinctrl/freescale/pinctrl-imx.c
+++ b/drivers/pinctrl/freescale/pinctrl-imx.c
@@ -605,8 +605,8 @@ static int imx_pinctrl_probe_dt(struct platform_device *pdev,
 	struct device_node *np = pdev->dev.of_node;
 	struct device_node *child;
 	struct pinctrl_dev *pctl = ipctl->pctl;
-	u32 nfuncs = 0;
-	u32 i = 0;
+	int nfuncs = 0;
+	int i = 0;
 	bool flat_funcs;
 
 	if (!np)
-- 
2.15.1