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 02:55:11 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Daniel Mack <daniel@...aq.de>
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 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.

Rafael


> ---
>  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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