linux-kernel - [patch] ds2782_battery: signedness bug in ds278x_read

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Message-ID: <20121024071229.GB2536@elgon.mountain>
Date:	Wed, 24 Oct 2012 10:12:29 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Anton Vorontsov <cbou@...l.ru>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] ds2782_battery: signedness bug in ds278x_read_reg16()

We need to check for negative values before doing the swab16() for the
error handling to work.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/power/ds2782_battery.c b/drivers/power/ds2782_battery.c
index 6bb6e2f..2fa9b6b 100644
--- a/drivers/power/ds2782_battery.c
+++ b/drivers/power/ds2782_battery.c
@@ -80,13 +80,13 @@ static inline int ds278x_read_reg16(struct ds278x_info *info, int reg_msb,
 {
 	int ret;
 
-	ret = swab16(i2c_smbus_read_word_data(info->client, reg_msb));
+	ret = i2c_smbus_read_word_data(info->client, reg_msb);
 	if (ret < 0) {
 		dev_err(&info->client->dev, "register read failed\n");
 		return ret;
 	}
 
-	*val = ret;
+	*val = swab16(ret);
 	return 0;
 }
 
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