linux-kernel - [PATCH] regulator: MAX8997: Fix for divide by zero error

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Message-Id: <1308627539-8980-1-git-send-email-tushar.behera@linaro.org>
Date:	Tue, 21 Jun 2011 09:08:59 +0530
From:	Tushar Behera <tushar.behera@...aro.org>
To:	linux-kernel@...r.kernel.org, linaro-dev@...ts.linaro.org
Cc:	patches@...aro.org, lrg@...com,
	broonie@...nsource.wolfsonmicro.com,
	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: [PATCH] regulator: MAX8997: Fix for divide by zero error

Currently, ramp_delay variable is used uninitialzed in
max8997_set_voltage_ldobuck which gets called through
regulator_register calls.

To fix the problem, in max8997_pmic_probe, ramp_delay initialization
code is moved before calls to regulator_register.

Cc: Liam Girdwood <lrg@...com>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: MyungJoo Ham <myungjoo.ham@...sung.com>
Cc: Kyungmin Park <kyungmin.park@...sung.com>
Cc: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Tushar Behera <tushar.behera@...aro.org>
---
 drivers/regulator/max8997.c |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c
index 10d5a1d..0fc7b8c 100644
--- a/drivers/regulator/max8997.c
+++ b/drivers/regulator/max8997.c
@@ -1124,6 +1124,10 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 				0x3f);
 	}
 
+	/* Misc Settings */
+	max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
+	max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
+
 	for (i = 0; i < pdata->num_regulators; i++) {
 		const struct voltage_map_desc *desc;
 		int id = pdata->regulators[i].id;
@@ -1148,10 +1152,6 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
 		}
 	}
 
-	/* Misc Settings */
-	max8997->ramp_delay = 10; /* set 10mV/us, which is the default */
-	max8997_write_reg(i2c, MAX8997_REG_BUCKRAMP, (0xf << 4) | 0x9);
-
 	return 0;
 err:
 	for (i = 0; i < max8997->num_regulators; i++)
-- 
1.7.4.1

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