Re: [PATCH] regulator: core: Lookup based on supply name alone as last option

From: Charles Keepax
Date: Tue Jun 27 2017 - 12:28:51 EST


On Mon, Jun 26, 2017 at 10:57:12PM -0700, Gaurav Gupta wrote:
> If there are two regulators with the same supply name, the current
> lookup just based on the supply name would always return the first one.
> Further in the function, there is code to check both dev name and supply
> name and return the matching regulator. This should be done before the
> lookup based on supply name alone, which should be a last resort.
>
> Signed-off-by: Gaurav Gupta <gauragup@xxxxxxxxx>
> ---

A patch has already been merged to do this:

https://lkml.org/lkml/2017/6/13/852

Thanks,
Charles

> drivers/regulator/core.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
> index c0d9ae8..80460df 100644
> --- a/drivers/regulator/core.c
> +++ b/drivers/regulator/core.c
> @@ -1489,10 +1489,6 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
> if (dev)
> devname = dev_name(dev);
>
> - r = regulator_lookup_by_name(supply);
> - if (r)
> - return r;
> -
> mutex_lock(&regulator_list_mutex);
> list_for_each_entry(map, &regulator_map_list, list) {
> /* If the mapping has a device set up it must match */
> @@ -1508,6 +1504,7 @@ static struct regulator_dev *regulator_dev_lookup(struct device *dev,
> }
> mutex_unlock(&regulator_list_mutex);
>
> + r = regulator_lookup_by_name(supply);

Also the loop above doesn't return it simply sets r so this would
overwrite the discovered regulator with the lookup based on
supply name alone.

> if (r)
> return r;
>
> --
> 2.10.2.dirty