linux-kernel - [PATCH] gpio: ep93xx: fix test for end of loop

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Message-ID: <20180906133348.brzvqt53nzukn7n2@kili.mountain>
Date:   Thu, 6 Sep 2018 16:33:48 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Colin King <colin.king@...onical.com>
Subject: [PATCH] gpio: ep93xx: fix test for end of loop

The problem is that if port == ARRAY_SIZE() and "gc == &epg->gc[port]"
then that should be treated as invalid.

Fixes: fd935fc421e7 ("gpio: ep93xx: Do not pingpong irq numbers")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/gpio/gpio-ep93xx.c b/drivers/gpio/gpio-ep93xx.c
index 68a416fc3141..b0699f57ddf5 100644
--- a/drivers/gpio/gpio-ep93xx.c
+++ b/drivers/gpio/gpio-ep93xx.c
@@ -80,7 +80,7 @@ static int ep93xx_gpio_port(struct gpio_chip *gc)
 		port++;
 
 	/* This should not happen but is there as a last safeguard */
-	if (gc != &epg->gc[port]) {
+	if (port == ARRAY_SIZE(epg->gc)) {
 		pr_crit("can't find the GPIO port\n");
 		return 0;
 	}