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authorKangjie Lu <kjlu@umn.edu>2018-12-19 08:04:13 +0300
committerMark Brown <broonie@kernel.org>2018-12-19 15:37:52 +0300
commit966e927bf8cc6a44f8b72582a1d6d3ffc73b12ad (patch)
treeca43c6c5bf5f25abc61cbd98f59ce734a3401ad2 /drivers/regulator/palmas-regulator.c
parent22a5a4a44c43e2993e96183039aef71566e1a514 (diff)
downloadlinux-966e927bf8cc6a44f8b72582a1d6d3ffc73b12ad.tar.xz
drivers/regulator: fix a missing check of return value
If palmas_smps_read() fails, we should not use the read data in "reg" which may contain random value. The fix inserts a check for the return value of palmas_smps_read(): If it fails, we return the error code upstream and stop using "reg". Signed-off-by: Kangjie Lu <kjlu@umn.edu> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator/palmas-regulator.c')
-rw-r--r--drivers/regulator/palmas-regulator.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c
index bb5ab7d78895..c2cc392a27d4 100644
--- a/drivers/regulator/palmas-regulator.c
+++ b/drivers/regulator/palmas-regulator.c
@@ -443,13 +443,16 @@ static int palmas_ldo_write(struct palmas *palmas, unsigned int reg,
static int palmas_set_mode_smps(struct regulator_dev *dev, unsigned int mode)
{
int id = rdev_get_id(dev);
+ int ret;
struct palmas_pmic *pmic = rdev_get_drvdata(dev);
struct palmas_pmic_driver_data *ddata = pmic->palmas->pmic_ddata;
struct palmas_regs_info *rinfo = &ddata->palmas_regs_info[id];
unsigned int reg;
bool rail_enable = true;
- palmas_smps_read(pmic->palmas, rinfo->ctrl_addr, &reg);
+ ret = palmas_smps_read(pmic->palmas, rinfo->ctrl_addr, &reg);
+ if (ret)
+ return ret;
reg &= ~PALMAS_SMPS12_CTRL_MODE_ACTIVE_MASK;