linux-kernel - Re: [S390] cio: fix stsch

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Message-ID: <OF1F9F8563.7DAF2D31-ON4125725D.0035EA2F-4125725D.003662B6@de.ibm.com>
Date:	Mon, 8 Jan 2007 10:54:02 +0100
From:	Michael Holzheu <HOLZHEU@...ibm.com>
To:	heicars2@...ux.vnet.ibm.com
Cc:	Chuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel@...r.kernel.org, mschwid2@...ux.vnet.ibm.com
Subject: Re: [S390] cio: fix stsch_reset.

heicars2@...ux.vnet.ibm.com wrote on 12/31/2006 01:22:03 PM:

> On Sun, Dec 31, 2006 at 01:31:43AM -0500, Chuck Ebbert wrote:
> > In-Reply-To: <20061228103925.GB6270@...base>
> >
> > On Thu, 28 Dec 2006 11:39:25 +0100, Martin Schwidefsky wrote:
> >
> > > @@ -881,10 +880,18 @@ static void cio_reset_pgm_check_handler(
> > >  static int stsch_reset(struct subchannel_id schid, volatile
> struct schib *addr)
> > >  {
> > >       int rc;
> > > +     register struct subchannel_id reg1 asm ("1") = schid;
> > >
> > >       pgm_check_occured = 0;
> > >       s390_reset_pgm_handler = cio_reset_pgm_check_handler;
> > > -     rc = stsch(schid, addr);
> > > +
> > > +     asm volatile(
> > > +             "       stsch   0(%2)\n"
> > > +             "       ipm     %0\n"
> > > +             "       srl     %0,28"
> > > +             : "=d" (rc)
> > > +             : "d" (reg1), "a" (addr), "m" (*addr) : "memory",
"cc");
> > > +
> > >       s390_reset_pgm_handler = NULL;
> > >       if (pgm_check_occured)
> > >               return -EIO;
> >
> >
> > Can't you just put a barrier() before the stsch() call?
>
> Yes, that would work too and would look much nicer.
>
> I think we should change the reset program check handler, so that it
searches
> the exception tables.

I think that this is really overkill, since having program checks in the
reset case will be VERY rare and stsch will probably the only case.
I would do that only, if we have a component, which needs that.

And I assume, that this will never happen!

Michael


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