From: Kangjie Lu kjlu@umn.edu
[ Upstream commit 966e927bf8cc6a44f8b72582a1d6d3ffc73b12ad ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/regulator/palmas-regulator.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c index 8217613807d37..4a4766c43e616 100644 --- a/drivers/regulator/palmas-regulator.c +++ b/drivers/regulator/palmas-regulator.c @@ -435,13 +435,16 @@ 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, ®); + ret = palmas_smps_read(pmic->palmas, rinfo->ctrl_addr, ®); + if (ret) + return ret;
reg &= ~PALMAS_SMPS12_CTRL_MODE_ACTIVE_MASK;