linux-kernel - Re: [PATCH] ARM: remove redundant irq disable at halt and restart

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Message-ID: <20141024192111.GC11455@saruman>
Date:	Fri, 24 Oct 2014 14:21:11 -0500
From:	Felipe Balbi <balbi@...com>
To:	Felipe Balbi <balbi@...com>
CC:	Johan Hovold <johan@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: remove redundant irq disable at halt and restart

On Fri, Oct 24, 2014 at 02:16:27PM -0500, Felipe Balbi wrote:
> On Fri, Oct 24, 2014 at 09:06:32PM +0200, Johan Hovold wrote:
> > Remove redundant local_irq_disable() at machine halt and restart.
> > 
> > Since commit 44424c34049f ("ARM: 7803/1: Fix deadlock scenario with
> > smp_send_stop()") interrupts are disabled before stopping secondary
> > CPUs.
> 
> Assuming this is correct, you should have:
> 
> Fixes: 44424c3 (ARM: 7803/1: Fix deadlock scenario with smp_send_stop())
> Cc: <stable@...r.kernel.org> # v3.12+
> 
> > Signed-off-by: Johan Hovold <johan@...nel.org>
> > ---
> >  arch/arm/kernel/process.c | 2 --
> >  1 file changed, 2 deletions(-)
> > 
> > diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
> > index a35f6ebbd2c2..5663ab57cf07 100644
> > --- a/arch/arm/kernel/process.c
> > +++ b/arch/arm/kernel/process.c
> > @@ -195,7 +195,6 @@ void machine_halt(void)
> >  	local_irq_disable();
> >  	smp_send_stop();
> >  
> > -	local_irq_disable();
> >  	while (1);
> >  }
> >  
> > @@ -237,7 +236,6 @@ void machine_restart(char *cmd)
> >  
> >  	/* Whoops - the platform was unable to reboot. Tell the user! */
> >  	printk("Reboot failed -- System halted\n");
> > -	local_irq_disable();
> 
> ... but wouldn't this reintroduce the the buck which that commit fixed ?

s/buck/bug :-) my fingers have a mind of their own, aparently.

-- 
balbi

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