linux-kernel - Re: MMC: s3cmci: ensure host stopped on machine shutdown

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Message-ID: <20080717155037.GI24620@fluff.org.uk>
Date:	Thu, 17 Jul 2008 16:50:37 +0100
From:	Ben Dooks <ben-linux@...ff.org>
To:	Pierre Ossman <drzeus-mmc@...eus.cx>
Cc:	Ben Dooks <ben-linux@...ff.org>, linux-kernel@...r.kernel.org
Subject: Re: MMC: s3cmci: ensure host stopped on machine shutdown

On Thu, Jul 17, 2008 at 05:29:45PM +0200, Pierre Ossman wrote:
> On Thu, 17 Jul 2008 15:32:54 +0100
> Ben Dooks <ben-linux@...ff.org> wrote:
> 
> > Ensure that the s3cmci host controller is turned off
> > when the machine is shutdown, otherwise we end up
> > leaving the card powered and processing insertion and
> > removal events after the system prints "System halted."
> > 
> > Signed-off-by: Ben Dooks <ben-linux@...ff.org>
> > 
> > Index: linux-2.6.26-quilt3/drivers/mmc/host/s3cmci.c
> > ===================================================================
> > --- linux-2.6.26-quilt3.orig/drivers/mmc/host/s3cmci.c	2008-07-17 15:15:35.000000000 +0100
> > +++ linux-2.6.26-quilt3/drivers/mmc/host/s3cmci.c	2008-07-17 15:29:23.000000000 +0100
> > @@ -1331,21 +1331,30 @@ static int __devinit s3cmci_probe(struct
> >  	return ret;
> >  }
> >  
> > +static void s3cmci_shutdown(struct platform_device *pdev)
> > +{
> > +	struct mmc_host	*mmc = platform_get_drvdata(pdev);
> > +	struct s3cmci_host *host = mmc_priv(mmc);
> > +
> > +	if (host->irq_cd >= 0)
> > +		free_irq(host->irq_cd, host);
> > +
> > +	mmc_remove_host(mmc);
> > +	clk_disable(host->clk);
> > +}
> > +
> 
> The core can send requests your way until mmc_remove_host() returns so
> you can't remove the interrupt before then.

I'm only removing the card-detect interrupt, the main host one
is not being disabled here.

-- 
Ben (ben@...ff.org, http://www.fluff.org/)

  'a smiley only costs 4 bytes'
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