linux-kernel - Re: [PATCH 02/12] handle multiple network paths to AoE device

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Message-ID: <20070711144610.GE32346@coraid.com>
Date:	Wed, 11 Jul 2007 10:46:10 -0400
From:	"Ed L. Cashin" <ecashin@...aid.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Greg K-H <greg@...ah.com>
Subject: Re: [PATCH 02/12] handle multiple network paths to AoE device

On Mon, Jul 02, 2007 at 09:29:49PM -0700, Andrew Morton wrote:
> On Tue, 26 Jun 2007 14:50:10 -0400 "Ed L. Cashin" <ecashin@...aid.com> wrote:
...
> > +loop:
> > +	skb = aoecmd_ata_id(d);
> >  	spin_unlock_irqrestore(&d->lock, flags);
> > +	if (!skb && !msleep_interruptible(200)) {
> > +		spin_lock_irqsave(&d->lock, flags);
> > +		goto loop;
> > +	}
> > +	aoenet_xmit(skb);
> >  	aoecmd_cfg(major, minor);
> > -
> >  	return 0;
> >  }
> 
> interruptible sleep?  Does this code work as intended when there's a signal
> pending?  (Maybe that's what the interruptible sleep is for: don't know,
> and am not inclined to work it out given the (low) level of comments in
> here and the (lower) level of changelogging).

Yes, if a signal is pending, then msleep_interruptible will not return
0.  That means we will not loop but will call aoenet_xmit with a NULL
skb, which is a noop.  So if the system is too low on memory or the
aoe driver is too low on frames, then the user can hit control-C to
interrupt the attempt to do a revalidate.

I will add a comment to that effect in the resubmitted patch.

-- 
  Ed L Cashin <ecashin@...aid.com>
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