From: Muli Ben-Yehuda <muli@il.ibm.com>
To: "Darrick J. Wong" <djwong@us.ibm.com>
Cc: Jeff Garzik <jeff@garzik.org>, linux-scsi@vger.kernel.org
Subject: Re: [PATCH] aic94xx: fix SMP request DMA direction
Date: Sun, 30 Sep 2007 09:26:52 +0200 [thread overview]
Message-ID: <20070930072652.GG4239@rhun.haifa.ibm.com> (raw)
In-Reply-To: <20070930071355.GC21125@tree.beaverton.ibm.com>
On Sun, Sep 30, 2007 at 12:13:55AM -0700, Darrick J. Wong wrote:
> Actually, SMP commands are used during device discovery to find
> things attached to expanders, so it seems likely that "it blows up
> almost immediately after loading the module" symptoms are a result
> of this bug.
>
> That said, the bug that Jeff fixed resulted in extra permissions
> (+w) being set for the SMP request buffer, so that's probably why
> I've never seen any problems manifesting on x260/x3800 systems.
>
> (Unless the CalIOC2 has a write only mode?)
It does (you can turn on each of the R and W bits in the TCE entry
seperately) but we don't make use of it - we set it to either none, RO
or RW.
Cheers,
Muli
prev parent reply other threads:[~2007-09-30 7:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-28 2:33 [PATCH] aic94xx: fix SMP request DMA direction Jeff Garzik
2007-09-28 23:55 ` Darrick J. Wong
2007-09-29 6:22 ` Muli Ben-Yehuda
2007-09-29 6:25 ` Jeff Garzik
2007-09-30 7:13 ` Darrick J. Wong
2007-09-30 7:26 ` Muli Ben-Yehuda [this message]
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