linux-kernel - Re: [PATCH v2 4/7] ghes_edac: avoid multiple calls to dmi

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Date:   Wed, 16 Aug 2017 17:28:50 +0000
From:   "Kani, Toshimitsu" <toshi.kani@....com>
To:     "bp@...en8.de" <bp@...en8.de>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "lenb@...nel.org" <lenb@...nel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>
Subject: Re: [PATCH v2 4/7] ghes_edac: avoid multiple calls to dmi_walk()

On Wed, 2017-08-16 at 18:42 +0200, Borislav Petkov wrote:
> On Wed, Aug 16, 2017 at 03:26:04PM +0000, Kani, Toshimitsu wrote:
> > I believe you now need to protect from a race condition that a
> > single mci and pvt can be initialized / consumed from multiple
> > threads.  This protection is missing in your patch.
> 
> Easy. Done.

Assuming this big spinlock works, yes, this addresses my concern that
it does not allow concurrent accesses to mci. :-)

I will test the patch with an SCI when I got a chance.  I won't be able
to test other notification types or race conditions, though.

Thanks,
-Toshi