linux-kernel - Re: [PATCH] preserve correct battery state through suspend/resume cycles

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Message-ID: <20061006214351.GB29572@elf.ucw.cz>
Date:	Fri, 6 Oct 2006 23:43:51 +0200
From:	Pavel Machek <pavel@....cz>
To:	Jiri Kosina <jikos@...os.cz>
Cc:	Len Brown <len.brown@...el.com>, linux-acpi@...el.com,
	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH] preserve correct battery state through suspend/resume cycles

Hi!

> There is a problem in th following scenario(s):
> 
> boot -> suspend -> (un)plug battery -> resume
> 
> The problem arises in both cases - i.e. suspend with battery plugged in, 
> and resume with battery unplugged, or vice versa.
> 
> After resume, when the battery status has changed (plugged in -> unplegged 
> or unplugged -> plugged in) during the time when the system was sleeping, 
> the /proc/acpi/battery/*/* is wrong (showing the state before suspend, not 
> the current state).
> 
> The following patch adds ->resume method to the ACPI battery handler, which
> has the only aim - to check whether the battery state has changed during sleep, 
> and if so, update the ACPI internal data structures, so that information 
> published through /proc/acpi/battery/*/* is correct even after suspend/resume
> cycle, during which the battery was removed/inserted.
> 
> The patch is against current ACPI git tree, but applies cleanly also 
> against -mm and probably other trees. Please apply.
> 
> Signed-off-by: Jiri Kosina <jikos@...os.cz>

Looks okay to me.
									Pavel

-- 
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