linux-kernel - Re: [PATCH] leds: lm3532: Fix optional led-max-microamp prop error handling

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Message-ID: <20190829212247.GB32254@amd>
Date:   Thu, 29 Aug 2019 23:22:48 +0200
From:   Pavel Machek <pavel@....cz>
To:     Jacek Anaszewski <jacek.anaszewski@...il.com>
Cc:     Dan Murphy <dmurphy@...com>, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] leds: lm3532: Fix optional led-max-microamp prop error
 handling

On Thu 2019-08-29 22:04:18, Jacek Anaszewski wrote:
> Hi Dan,
> 
> Thanks for the update.
> 
> On 8/29/19 9:18 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@....cz>
> > Signed-off-by: Dan Murphy <dmurphy@...com>
> > ---
> >  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 c5cfd8e3f15f..13b4265fb85a 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");
> > +
> > +			if (led->full_scale_current > LM3532_FS_CURR_MAX)
> > +				led->full_scale_current = LM3532_FS_CURR_MAX;
> 
> One more nit: we have min() macro in kernel.h for such things.

Actually, I believe this one is okay. min() would be also good, but
improvement is not that big, as it still duplicates the argument.

led->full_scale_current = min(led->full_scale_current, LM3532_FS_CURR_MAX)

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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