linux-kernel - [PATCH] thermal: Fix test of unsigned in thermal_cooling_device_cur_state

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Date:	Tue, 15 Dec 2009 22:46:50 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Zhang Rui <rui.zhang@...el.com>,
	Matthew Garrett <mjg@...hat.com>
Subject: [PATCH] thermal: Fix test of unsigned in thermal_cooling_device_cur_state_store()

state is unsigned long so the test did not work.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
Found using coccinelle: http://coccinelle.lip6.fr/

Is this the best way to fix this?

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 6f8d8f9..800e0c5 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -374,7 +374,7 @@ thermal_cooling_device_cur_state_store(struct device *dev,
 	if (!sscanf(buf, "%ld\n", &state))
 		return -EINVAL;
 
-	if (state < 0)
+	if ((long)state < 0)
 		return -EINVAL;
 
 	result = cdev->ops->set_cur_state(cdev, state);
--
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