linux-kernel - Re: [PATCH v2.6.38-rc7] Revert "libata: ahci_start

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Date:	Fri, 20 May 2011 11:40:20 -0400
From:	Valdis.Kletnieks@...edu
To:	Jian Peng <jipeng2005@...il.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Tejun Heo <tj@...nel.org>,
	Jeff Garzik <jgarzik@...ox.com>,
	Michael Leun <lkml20100708@...ton.leun.net>,
	linux-ide@...r.kernel.org,
	Linux PM mailing list <linux-pm@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2.6.38-rc7] Revert "libata: ahci_start_engine compliant to AHCI spec"

On Wed, 18 May 2011 17:14:56 PDT, Jian Peng said:

> > @@ -1353,6 +1332,8 @@
> >
> >
> >   ahci_start_engine(ap);
> >
> > + msleep(5);
> > +
> >   if (online)
> >
> >    *class = ahci_dev_classify(ap);
> >

It may very well be that adding a magic msleep(5) here just Makes It Work, but
I have a gut feeling that it's in the wrong place (for starters, 'online' can't change
during the msleep() unless somebody *else* sets it - in which case the locking
is screwed up as we're not forcing a re-read of the value).  The msleep() probably
needs to be before something else further down in the code (but I have no idea
exactly what).

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