From: Axel Lin <axel.lin@ingics.com>
Date: Thu, 18 Jul 2013 14:21:57 +0000 (+0800)
Subject: regulator: core: Allow fixed voltage range in multiple linear ranges
X-Git-Tag: accepted/tizen/common/20141203.182822~1628^2~10^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a56d66a2f01b172bc00d73b0b0392423c8aaae19;p=platform%2Fkernel%2Flinux-arm64.git

regulator: core: Allow fixed voltage range in multiple linear ranges

Current code does not allow fixed voltage range in multiple linear ranges.
If someone does set range->uV_step == 0 in one of the linear ranges, we hit
divided by zero bug. This patch fixes this issue.
For fixed voltage range, return any selector means the same voltage.
Thus just return 0.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
---

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e8604be..fd3f6e0 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2436,9 +2436,15 @@ int regulator_map_voltage_linear_range(struct regulator_dev *rdev,
 		if (min_uV <= range->min_uV)
 			min_uV = range->min_uV;
 
-		ret = DIV_ROUND_UP(min_uV - range->min_uV, range->uV_step);
-		if (ret < 0)
-			return ret;
+		/* range->uV_step == 0 means fixed voltage range */
+		if (range->uV_step == 0) {
+			ret = 0;
+		} else {
+			ret = DIV_ROUND_UP(min_uV - range->min_uV,
+					   range->uV_step);
+			if (ret < 0)
+				return ret;
+		}
 
 		break;
 	}