From mboxrd@z Thu Jan 1 00:00:00 1970 From: scameron@beardog.cce.hp.com Subject: Re: [PATCH] hpsa: do not attempt to read from a write-only register Date: Mon, 11 Jul 2011 16:08:41 -0500 Message-ID: <20110711210841.GC25366@beardog.cce.hp.com> References: <20110708195926.3623.30375.stgit@beardog.cce.hp.com> <20110711131911.31789ee0.akpm@linux-foundation.org> <20110711205124.GB25366@beardog.cce.hp.com> <20110711140450.a6f3e8be.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from g5t0009.atlanta.hp.com ([15.192.0.46]:20155 "EHLO g5t0009.atlanta.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750870Ab1GKVPX (ORCPT ); Mon, 11 Jul 2011 17:15:23 -0400 Content-Disposition: inline In-Reply-To: <20110711140450.a6f3e8be.akpm@linux-foundation.org> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Andrew Morton Cc: james.bottomley@hansenpartnership.com, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, stephenmcameron@gmail.com, thenzl@redhat.com, mikem@beardog.cce.hp.com On Mon, Jul 11, 2011 at 02:04:50PM -0700, Andrew Morton wrote: > On Mon, 11 Jul 2011 15:51:24 -0500 > scameron@beardog.cce.hp.com wrote: > > > On Mon, Jul 11, 2011 at 01:19:11PM -0700, Andrew Morton wrote: > > > On Fri, 08 Jul 2011 14:59:26 -0500 > > > "Stephen M. Cameron" wrote: > > > > > > > From: Stephen M. Cameron > > > > > > > > Most smartarrays tolerate it, but a few new ones don't. > > > > > > > > Signed-off-by: Stephen M. Cameron > > > > --- > > > > drivers/scsi/hpsa.h | 2 +- > > > > 1 files changed, 1 insertions(+), 1 deletions(-) > > > > > > > > diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h > > > > index 6d8dcd4..7f53cea 100644 > > > > --- a/drivers/scsi/hpsa.h > > > > +++ b/drivers/scsi/hpsa.h > > > > @@ -214,7 +214,7 @@ static void SA5_submit_command(struct ctlr_info *h, > > > > dev_dbg(&h->pdev->dev, "Sending %x, tag = %x\n", c->busaddr, > > > > c->Header.Tag.lower); > > > > writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET); > > > > - (void) readl(h->vaddr + SA5_REQUEST_PORT_OFFSET); > > > > + (void) readl(h->vaddr + SA5_SCRATCHPAD_OFFSET); > > > > h->commands_outstanding++; > > > > if (h->commands_outstanding > h->max_outstanding) > > > > h->max_outstanding = h->commands_outstanding; > > > > > > The changelog forgot to tell us the user-visible effects of the bug. > > > That was really really bad of it. Bad changelog. No bone for you. > > > > Oh, sorry. When the controller doesn't tolerate the bug, the firmware > > on it locks up. No interrupts are received, no commands complete. I/o > > on that controller grinds to a halt. > > OK, that was important. > > Presumably you'd like those newer controllers to work with older > kernels? In which case we should mark the patch for -stable > backporting? Yes. > > I've done that to my copy and have updated the changelog. > > > I can resubmit if you like. > > I have two other needed-in-3.0 scsi patches. I'll send all three > Jameswards now.