Dan
On 08/17/2015 09:38 AM, Dan Carpenter wrote:
> tsl4531_check_id() returns 1 on "found", 0 on "not found" and negative
> if there is an error. The bug here is that the error handling, treats
> errors as "found".
>
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> ---
> v2: slightly different fix
>
> diff --git a/drivers/iio/light/tsl4531.c b/drivers/iio/light/tsl4531.c
> index 2697918..fca0cb0 100644
> --- a/drivers/iio/light/tsl4531.c
> +++ b/drivers/iio/light/tsl4531.c
> @@ -180,7 +180,10 @@ static int tsl4531_probe(struct i2c_client *client,
> data->client = client;
> mutex_init(&data->lock);
>
> - if (!tsl4531_check_id(client)) {
> + ret = tsl4531_check_id(client);
> + if (ret < 0)
> + return ret;
> + if (ret == 0) {
> dev_err(&client->dev, "no TSL4531 sensor\n");
> return -ENODEV;
> }
Almost but not quite. The suggestion from Jon and myself was to return 0 on device found and
non-zero on an error or not found.
In the check_id call I would probably do something like
switch (ret >> TSL4531_ID_SHIFT) {
case TSL45311_ID:
case TSL45313_ID:
case TSL45315_ID:
case TSL45317_ID:
return 0;
default:
return -ENODEV;
}
You could probably just drop the default case all together and just have the call return -ENODEV
Then in probe you just need to do
if (tsl4531_check_id(client)) {
return ret;
This way you will return the exact error.
Dan
--
------------------
Dan Murphy
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