linux-kernel - RE: [PATCH] pinctrl: amd: fix compilation warning

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Date:   Tue, 3 Jan 2017 08:37:38 +0000
From:   "Shah, Nehal-bakulchandra" <Nehal-bakulchandra.Shah@....com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
CC:     "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "S-k, Shyam-sundar" <Shyam-sundar.S-k@....com>
Subject: RE: [PATCH] pinctrl: amd: fix compilation warning

Thanks Linus for fixing this.

Nehal

-----Original Message-----
From: Linus Walleij [mailto:linus.walleij@...aro.org] 
Sent: Tuesday, January 3, 2017 1:51 PM
To: linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
Cc: linux-gpio@...r.kernel.org; Linus Walleij <linus.walleij@...aro.org>; S-k, Shyam-sundar <Shyam-sundar.S-k@....com>; Shah, Nehal-bakulchandra <Nehal-bakulchandra.Shah@....com>
Subject: [PATCH] pinctrl: amd: fix compilation warning

3bfd44306c65 ("pinctrl: amd: Add support for additional GPIO") created the following warning:

drivers/pinctrl/pinctrl-amd.c: In function 'amd_gpio_dbg_show':
drivers/pinctrl/pinctrl-amd.c:210:3: warning: 'pin_num' may be used uninitialized in this function [-Wmaybe-uninitialized]
   for (; i < pin_num; i++) {
   ^
drivers/pinctrl/pinctrl-amd.c:172:21: warning: 'i' may be used uninitialized in this function [-Wmaybe-uninitialized]
  unsigned int bank, i, pin_num;
                     ^
Fix this by adding a guarding default case for illegal bank numbers.

Cc: S-k Shyam-sundar <Shyam-sundar.S-k@....com>
Cc: Nehal Shah <Nehal-bakulchandra.Shah@....com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/pinctrl/pinctrl-amd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-amd.c b/drivers/pinctrl/pinctrl-amd.c index 47b17100410e..c2203699f1ab 100644
--- a/drivers/pinctrl/pinctrl-amd.c
+++ b/drivers/pinctrl/pinctrl-amd.c
@@ -206,6 +206,9 @@ static void amd_gpio_dbg_show(struct seq_file *s, struct gpio_chip *gc)
 			i = 192;
 			pin_num = AMD_GPIO_PINS_BANK3 + i;
 			break;
+		default:
+			/* Illegal bank number, ignore */
+			continue;
 		}
 		for (; i < pin_num; i++) {
 			seq_printf(s, "pin%d\t", i);
--
2.9.3