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SubjectRe: [PATCH v2] leds: lm3532: Fix optional led-max-microamp prop error handling
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Jacek

On 9/12/19 2:12 PM, Jacek Anaszewski wrote:
> On 9/12/19 8:32 PM, Jacek Anaszewski wrote:> Hi Dan,
>> Thank you for the update.
>>
>> On 9/11/19 8:27 PM, Dan Murphy wrote:
>>> Fix the error handling for the led-max-microamp property.
>>> Need to check if the property is present and then if it is
>>> retrieve the setting and its max boundary
>>>
>>> Reported-by: Pavel Machek <pavel@ucw.cz>
>>> Signed-off-by: Dan Murphy <dmurphy@ti.com>
>>> ---
>>>
>>> v2 - Changed full scale current check to use min function
>>>
>>> drivers/leds/leds-lm3532.c | 14 +++++++++-----
>>> 1 file changed, 9 insertions(+), 5 deletions(-)
>>>
>>> diff --git a/drivers/leds/leds-lm3532.c b/drivers/leds/leds-lm3532.c
>>> index 62ace6698d25..a1742dc1f6fa 100644
>>> --- a/drivers/leds/leds-lm3532.c
>>> +++ b/drivers/leds/leds-lm3532.c
>>> @@ -601,11 +601,15 @@ static int lm3532_parse_node(struct lm3532_data *priv)
>>> goto child_out;
>>> }
>>>
>>> - ret = fwnode_property_read_u32(child, "led-max-microamp",
>>> - &led->full_scale_current);
>>> -
>>> - if (led->full_scale_current > LM3532_FS_CURR_MAX)
>>> - led->full_scale_current = LM3532_FS_CURR_MAX;
>>> + if (fwnode_property_present(child, "led-max-microamp")) {
>>> + if (fwnode_property_read_u32(child, "led-max-microamp",
>>> + &led->full_scale_current))
>>> + dev_err(&priv->client->dev,
>>> + "Failed getting led-max-microamp\n");
>>> + else
>>> + min(led->full_scale_current,
>>> + LM3532_FS_CURR_MAX);
> I didn't previously notice lack of assignment of min() return value.
>
> I've amended that and while at it improved a bit this construction to
> avoid some indentations and line breaks:
>
> diff --git a/drivers/leds/leds-lm3532.c b/drivers/leds/leds-lm3532.c
> index 62ace6698d25..0507c6575c08 100644
> --- a/drivers/leds/leds-lm3532.c
> +++ b/drivers/leds/leds-lm3532.c
> @@ -601,11 +601,14 @@ static int lm3532_parse_node(struct lm3532_data *priv)
> goto child_out;
> }
>
> - ret = fwnode_property_read_u32(child, "led-max-microamp",
> - &led->full_scale_current);
> -
> - if (led->full_scale_current > LM3532_FS_CURR_MAX)
> - led->full_scale_current = LM3532_FS_CURR_MAX;
> + if (fwnode_property_present(child, "led-max-microamp") &&
> + fwnode_property_read_u32(child, "led-max-microamp",
> + &led->full_scale_current))
> + dev_err(&priv->client->dev,
> + "Failed getting led-max-microamp\n");
> + else
> + led->full_scale_current = min(led->full_scale_current,
> + LM3532_FS_CURR_MAX);
>
> if (led->mode == LM3532_BL_MODE_ALS) {
> led->mode = LM3532_ALS_CTRL;
>
>
> Please let me know in case of any doubts.

This looks fine.  It always passed for me because I never set the FSC
above max

Dan

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