Grant, please take a quick look at this and check I didn't mess anything up.
Looks like a trivial context change was the issue, but best to be sure!
> V3 is a straightforward forward port to teh current tree of V2.
>
> Simple fix is to just not cache REG_TEST (offset 8).
> Cache doesn't help REG_TEST anyway since we write all 8 bits exactly once
> (at resume/init time).
>
> Also fix an "off-by-one" allocation of reg_cache[] array size that
> was in the original code before I touched it.
>
> Reported-by: Dan Carpenter <error27@xxxxxxxxx>
> Signed-off-by: Grant Grundler <grundler@xxxxxxxxxxxx>
> Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxx>
> ---
> drivers/staging/iio/light/isl29018.c | 23 ++++++++++++++---------
> 1 files changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/staging/iio/light/isl29018.c b/drivers/staging/iio/light/isl29018.c
> index f31e8c2..3e9a06c 100644
> --- a/drivers/staging/iio/light/isl29018.c
> +++ b/drivers/staging/iio/light/isl29018.c
> @@ -51,7 +51,7 @@
>
> #define ISL29018_REG_ADD_DATA_LSB 0x02
> #define ISL29018_REG_ADD_DATA_MSB 0x03
> -#define ISL29018_MAX_REGS ISL29018_REG_ADD_DATA_MSB
> +#define ISL29018_MAX_REGS (ISL29018_REG_ADD_DATA_MSB+1)
>
> #define ISL29018_REG_TEST 0x08
> #define ISL29018_TEST_SHIFT 0
> @@ -70,22 +70,27 @@ struct isl29018_chip {
> static int isl29018_write_data(struct i2c_client *client, u8 reg,
> u8 val, u8 mask, u8 shift)
> {
> - u8 regval;
> - int ret = 0;
> + u8 regval = val;
> + int ret;
> struct isl29018_chip *chip = iio_priv(i2c_get_clientdata(client));
>
> - regval = chip->reg_cache[reg];
> - regval &= ~mask;
> - regval |= val << shift;
> + /* don't cache or mask REG_TEST */
> + if (reg < ISL29018_MAX_REGS) {
> + regval = chip->reg_cache[reg];
> + regval &= ~mask;
> + regval |= val << shift;
> + }
>
> ret = i2c_smbus_write_byte_data(client, reg, regval);
> if (ret) {
> dev_err(&client->dev, "Write to device fails status %x\n", ret);
> - return ret;
> + } else {
> + /* don't update cache on err */
> + if (reg < ISL29018_MAX_REGS)
> + chip->reg_cache[reg] = regval;
> }
> - chip->reg_cache[reg] = regval;
>
> - return 0;
> + return ret;
> }
>
> static int isl29018_set_range(struct i2c_client *client, unsigned long range,
--
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