linux-kernel - [PATCH] BUG: pinmux: forbid mux_usecount to be set at UINT

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Date:	Wed, 20 Mar 2013 12:31:52 +0100
From:	Richard Genoud <richard.genoud@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Axel Lin <axel.lin@...ics.com>,
	Stephen Warren <swarren@...dia.com>,
	linux-kernel@...r.kernel.org,
	Richard Genoud <richard.genoud@...il.com>
Subject: [PATCH] BUG: pinmux: forbid mux_usecount to be set at UINT_MAX

If pin_free is called on a pin already freed, mux_usecount is set to
UINT_MAX which is really a bad idea.
This will silently ignore a double call to pin_free

Signed-off-by: Richard Genoud <richard.genoud@...il.com>
---
 drivers/pinctrl/pinmux.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 917e830..9fd55f9 100644
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -194,8 +194,9 @@ static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
 	}
 
 	if (!gpio_range) {
-		desc->mux_usecount--;
-		if (desc->mux_usecount)
+		if (1 == desc->mux_usecount)
+			desc->mux_usecount = 0;
+		else
 			return NULL;
 	}
 
-- 
1.7.2.5

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