Re: [FIX] apm.c: ignore_normal_resume is set to 1 a bit too late

[Jesper Juhl]

On 6/13/05, Thomas Hood <jdthood@xxxxxxxxxxxxx> wrote:
> This message contains a fix for a bug in the apm driver.
> 
> A bug report was submitted to the Debian BTS saying that on the
> submitter's system the apmd proxy script was being run twice on resume.
> 
> Having seen exactly the same problem some years ago and knowing that the
> solution then was to ensure that the ignore_normal_resume flag got set
> before there was any chance of an APM RESUME event being processed, I
> checked the current apm.c and I found that ignore_normal_resume was once
> again being set too late.  I asked the submitter to move the line where
> the flag was set and he reported that this change solved the problem.  I
> append the message in question.  The line numbers I mention there are
> for Linux 2.6.11.
> 
> Please make the indicated change to the apm driver.
> 
> -------- Forwarded Message --------
> jdthood@xxxxxxxxxxxxx wrote to the submitter of Debian bug #310865:
> > In arch/i386/kernel/apm.c there is at approximately line 1229:
> >
> >         ignore_normal_resume = 1;
> >
> > Move this up so that it occurs right after line 1222:
> >
> >         err = set_system_power_state(APM_STATE_SUSPEND);
> >
> > Let us know if that helps.
> 
> 
> It does. Very nice.
> I don't understand what I did and how it works. Will you try to
> push that into kernel sources or is this no permanent fix?
> --
> Thomas Hood <jdthood@xxxxxxxxxxxxx>
> 

Here it is in the form of a patch against 2.6.12-rc6-mm1 for easier
merging - Stephen, Andrew, is this a valid fix? I don't know the apm
code well enough to properly judge.
(also attached since gmail tends to mangle inline patches)


Prevent double resume in apm.

Signed-off-by: Jesper juhl <jesper.juhl@xxxxxxxxx>
---

 arch/i386/kernel/apm.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.12-rc6-mm1-orig/arch/i386/kernel/apm.c	2005-06-12
15:58:34.000000000 +0200
+++ linux-2.6.12-rc6-mm1/arch/i386/kernel/apm.c	2005-06-13
23:39:57.000000000 +0200
@@ -1222,6 +1222,7 @@ static int suspend(int vetoable)
 
 	save_processor_state();
 	err = set_system_power_state(APM_STATE_SUSPEND);
+	ignore_normal_resume = 1;
 	restore_processor_state();
 
 	local_irq_disable();
@@ -1229,7 +1230,6 @@ static int suspend(int vetoable)
 	spin_lock(&i8253_lock);
 	reinit_timer();
 	set_time();
-	ignore_normal_resume = 1;
 
 	spin_unlock(&i8253_lock);
 	write_sequnlock(&xtime_lock);



-- 
Jesper Juhl <jesper.juhl@xxxxxxxxx>
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--- linux-2.6.12-rc6-mm1-orig/arch/i386/kernel/apm.c	2005-06-12 15:58:34.000000000 +0200
+++ linux-2.6.12-rc6-mm1/arch/i386/kernel/apm.c	2005-06-13 23:39:57.000000000 +0200
@@ -1222,6 +1222,7 @@ static int suspend(int vetoable)
 
 	save_processor_state();
 	err = set_system_power_state(APM_STATE_SUSPEND);
+	ignore_normal_resume = 1;
 	restore_processor_state();
 
 	local_irq_disable();
@@ -1229,7 +1230,6 @@ static int suspend(int vetoable)
 	spin_lock(&i8253_lock);
 	reinit_timer();
 	set_time();
-	ignore_normal_resume = 1;
 
 	spin_unlock(&i8253_lock);
 	write_sequnlock(&xtime_lock);