linux-kernel - Re: [PATCH 9/9] omap mmc host: Use disable_irq

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Message-ID: <20090514172226.GK5593@atomide.com>
Date:	Thu, 14 May 2009 10:22:26 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Pierre Ossman <pierre@...man.eu>
Cc:	Carlos Aguiar <carlos.aguiar@...t.org.br>,
	Anderson Briglia <briglia.anderson@...il.com>,
	"Syed Mohammed, Khasim" <x0khasim@...com>,
	Ben Nizette <bn@...sdigital.com>, linux-omap@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 9/9] omap mmc host: Use disable_irq_nosync() from
	within irq handlers.

* Pierre Ossman <pierre@...man.eu> [090426 12:22]:
> Should I queue this up or do you want to do something differently for
> this?

Looks like a valid fix to me.

Acked-by: Tony Lindgren <tony@...mide.com>
 
> On Thu, 16 Apr 2009 15:55:21 +1000
> Ben Nizette <bn@...sdigital.com> wrote:
> 
> > 
> > disable_irq() should wait for all running handlers to complete
> > before returning.  As such, if it's used to disable an interrupt
> > from that interrupt's handler it will deadlock.  This replaces
> > the dangerous instances with the _nosync() variant which doesn't
> > have this problem.
> > 
> > Signed-off-by: Ben Nizette <bn@...sdigital.com>
> > ---
> > diff --git a/drivers/mmc/host/omap.c b/drivers/mmc/host/omap.c
> > index 5570849..d5ea652 100644
> > --- a/drivers/mmc/host/omap.c
> > +++ b/drivers/mmc/host/omap.c
> > @@ -824,7 +824,7 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
> >  		del_timer(&host->cmd_abort_timer);
> >  		host->abort = 1;
> >  		OMAP_MMC_WRITE(host, IE, 0);
> > -		disable_irq(host->irq);
> > +		disable_irq_nosync(host->irq);
> >  		schedule_work(&host->cmd_abort_work);
> >  		return IRQ_HANDLED;
> >  	}
> 
> 
> -- 
>      -- Pierre Ossman
> 
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