linux-kernel - Re: [Regression] Commit "power_supply: Use attribute groups" breaks KDE battery monitor on openSUSE 11.3 M6

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Date:	Tue, 25 May 2010 09:08:44 +0200
From:	Daniel Mack <daniel@...aq.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Anton Vorontsov <cbouatmailru@...il.com>, Greg KH <gregkh@...e.de>,
	Kay Sievers <kay.sievers@...y.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Maciej Rutecki <maciej.rutecki@...il.com>
Subject: Re: [Regression] Commit "power_supply: Use attribute groups"
 breaks KDE battery monitor on openSUSE 11.3 M6

On Tue, May 25, 2010 at 02:55:11AM +0200, Rafael J. Wysocki wrote:
> On Tuesday 25 May 2010, Daniel Mack wrote:
> > On Tue, May 25, 2010 at 02:20:45AM +0200, Rafael J. Wysocki wrote:
> > > On Tuesday 25 May 2010, Rafael J. Wysocki wrote:
> > > > On Tuesday 25 May 2010, Daniel Mack wrote:
> > > > > On Tue, May 25, 2010 at 12:28:24AM +0200, Rafael J. Wysocki wrote:
> > > > > > Your commit 5f487cd34f4337f9bc27ca19da72a39d1b0a0ab4 (power_supply: Use
> > > > > > attribute groups) unfortunately breaks KDE 4.4's battery monitor from openSUSE
> > > > > > 11.3 Milestone 6 on my Acer Ferrari One.  Apparently, the battery monitor can't
> > > > > > access the sysfs battery attributes with this commit applied.
> > > > > 
> > > > > Can you still see the attributes in sysfs?
> > > > 
> > > > Yes, I can.
> > > 
> > > Ah, sorry.  The 'type' property is not present (I didn't notice that before).
> > 
> > Ah. That I didn't see. Does the (untested) patch below help?
> > 
> > Daniel
> > 
> > From ea5c518fb287d5e80e9a46ba1f9a17c45141187c Mon Sep 17 00:00:00 2001
> > From: Daniel Mack <daniel@...aq.de>
> > Date: Tue, 25 May 2010 02:39:45 +0200
> > Subject: [PATCH] power_supply: fix regression for 'type' property
> > 
> > Commit 5f487cd34f4337f9bc27ca19da72a39d1b0a0ab4 (power_supply: Use
> > attribute groups) causes a regression the power supply core does not
> > export the 'type' attribute anymore.
> > 
> > POWER_SUPPLY_PROP_TYPE is handled by the power supply core without the
> > low-level driver, so power_supply_attr_is_visible() must always return
> > the entry as readable.
> > 
> > Signed-off-by: Daniel Mack <daniel@...aq.de>
> > Reported-by: Rafael J. Wysocki <rjw@...k.pl>
> 
> Yes, that's it, thanks.

Good, thanks for testing.

I think Anton will pick this for battery-2.6.git.


Daniel


> >  drivers/power/power_supply_sysfs.c |    6 ++++--
> >  1 files changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/power/power_supply_sysfs.c b/drivers/power/power_supply_sysfs.c
> > index 6a86cdf..9d30eeb 100644
> > --- a/drivers/power/power_supply_sysfs.c
> > +++ b/drivers/power/power_supply_sysfs.c
> > @@ -179,14 +179,16 @@ static mode_t power_supply_attr_is_visible(struct kobject *kobj,
> >  {
> >  	struct device *dev = container_of(kobj, struct device, kobj);
> >  	struct power_supply *psy = dev_get_drvdata(dev);
> > +	mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
> >  	int i;
> >  
> > +	if (attrno == POWER_SUPPLY_PROP_TYPE)
> > +		return mode;
> > +
> >  	for (i = 0; i < psy->num_properties; i++) {
> >  		int property = psy->properties[i];
> >  
> >  		if (property == attrno) {
> > -			mode_t mode = S_IRUSR | S_IRGRP | S_IROTH;
> > -
> >  			if (psy->property_is_writeable &&
> >  			    psy->property_is_writeable(psy, property) > 0)
> >  				mode |= S_IWUSR;
> > 
> 
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