linux-kernel - [PATCH] misc: bmp085: Handle jiffies overflow correctly

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Message-Id: <1329672481-19583-1-git-send-email-bernhard@bwalle.de>
Date:	Sun, 19 Feb 2012 18:28:01 +0100
From:	Bernhard Walle <bernhard@...lle.de>
To:	christoph.mair@...il.com
Cc:	arnd@...db.de, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] misc: bmp085: Handle jiffies overflow correctly

By using the time_is_before_jiffies() macro instead of normal
arithmetic, the jiffies overflow is handled correctly.

Signed-off-by: Bernhard Walle <bernhard@...lle.de>
---
 drivers/misc/bmp085.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/misc/bmp085.c b/drivers/misc/bmp085.c
index b29a2be..7cfc598 100644
--- a/drivers/misc/bmp085.c
+++ b/drivers/misc/bmp085.c
@@ -234,7 +234,8 @@ static s32 bmp085_get_pressure(struct bmp085_data *data, int *pressure)
 	int status;
 
 	/* alt least every second force an update of the ambient temperature */
-	if (data->last_temp_measurement + 1*HZ < jiffies) {
+	if (data->last_temp_measurement == 0 ||
+			time_is_before_jiffies(data->last_temp_measurement + 1*HZ)) {
 		status = bmp085_get_temperature(data, NULL);
 		if (status != 0)
 			goto exit;
-- 
1.7.9.1

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