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SubjectRe: [PATCH 3/7] power: supply: core: fix HWMON temperature labels
On Thu, Apr 02, 2020 at 11:29:32AM -0700, Guenter Roeck wrote:
> On 4/2/20 8:00 AM, Michał Mirosław wrote:
> > On Thu, Apr 02, 2020 at 07:52:19AM -0700, Guenter Roeck wrote:
> >> On 4/2/20 7:46 AM, Michał Mirosław wrote:
> >>> tempX_label files are swapped compared to what
> >>> power_supply_hwmon_temp_to_property() uses. Make them match.
> >>> While at it, make room for labeling other channels.
> >>>
> >>> Fixes: e67d4dfc9ff1 ("power: supply: Add HWMON compatibility layer")
> >>> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> >>> ---
> >>> drivers/power/supply/power_supply_hwmon.c | 14 +++++++++++++-
> >>> 1 file changed, 13 insertions(+), 1 deletion(-)
> >>>
> >>> diff --git a/drivers/power/supply/power_supply_hwmon.c b/drivers/power/supply/power_supply_hwmon.c
> >>> index 75cf861ba492..83318a21fb52 100644
> >>> --- a/drivers/power/supply/power_supply_hwmon.c
> >>> +++ b/drivers/power/supply/power_supply_hwmon.c
> >>> @@ -43,6 +43,11 @@ static int power_supply_hwmon_curr_to_property(u32 attr)
> >>> }
> >>> }
> >>>
> >>> +static const char *const ps_temp_label[] = {
> >>> + "temp",
> >>> + "ambient temp",
> >>> +};
> >>> +
> >>> static int power_supply_hwmon_temp_to_property(u32 attr, int channel)
> >>> {
> >>> if (channel) {
> >>> @@ -144,7 +149,14 @@ static int power_supply_hwmon_read_string(struct device *dev,
> >>> u32 attr, int channel,
> >>> const char **str)
> >>> {
> >>> - *str = channel ? "temp" : "temp ambient";
> >>> + switch (type) {
> >>> + case hwmon_temp:
> >>> + *str = ps_temp_label[channel];
> >>> + break;
> >>> + default:
> >>> + break;
> >>
> >> That returns "no error" without setting *str, which is really asking for trouble.
> >
> > This is carried over from earlier version. No bug though, but I'll add a
> > patch while I'm at it.
> >
>
> This is incorrect. The previous version does not check the type and always sets *str.
>
> - *str = channel ? "temp" : "temp ambient";

The function is called only for channels that have HWMON_T_LABEL set.
This is extended in later patches, though, so the type is going to be
required then. I'll split the addition so its more clear.

Best Regards,
Michał Mirosław

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