linux-kernel - [PATCH] power: max17042: divide by 0 Crash because r

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Date:	Fri, 12 Aug 2011 21:18:18 -0700
From:	Philip Rakity <prakity@...vell.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	Anton Vorontsov <cbouatmailru@...il.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	"myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>
Subject: [PATCH] power: max17042: divide by 0 Crash because r_sns init too
 late

On MMP2 brownstone divide by 0 error since probe sets r_sns
after calling power_supply_register.

Move the code up a few lines.  r_sns comes from the platform
data.

PROP_CURRENT_AVG and PROP_CURRENT divide the result by r_sns.

Signed-off-by: Philip Rakity <prakity@...vell.com>
---
 drivers/power/max17042_battery.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/power/max17042_battery.c b/drivers/power/max17042_battery.c
index 9f0183c..4245806 100644
--- a/drivers/power/max17042_battery.c
+++ b/drivers/power/max17042_battery.c
@@ -210,6 +210,9 @@ static int __devinit max17042_probe(struct i2c_client *client,
 	if (!chip->pdata->enable_current_sense)
 		chip->battery.num_properties -= 2;
 
+	if (chip->pdata->r_sns == 0)
+		chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
+
 	ret = power_supply_register(&client->dev, &chip->battery);
 	if (ret) {
 		dev_err(&client->dev, "failed: power supply register\n");
@@ -226,9 +229,6 @@ static int __devinit max17042_probe(struct i2c_client *client,
 		max17042_write_reg(client, MAX17042_CGAIN, 0x0000);
 		max17042_write_reg(client, MAX17042_MiscCFG, 0x0003);
 		max17042_write_reg(client, MAX17042_LearnCFG, 0x0007);
-	} else {
-		if (chip->pdata->r_sns == 0)
-			chip->pdata->r_sns = MAX17042_DEFAULT_SNS_RESISTOR;
 	}
 
 	return 0;
-- 
1.7.0.4


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