linux-kernel - Re: [PATCH v2] i2c: designware: Fix corrupted memory seen in the ISR

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Message-ID: <ZQrR5RBBaJn4wZB+@arm.com>
Date:   Wed, 20 Sep 2023 12:05:09 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Jan Bottorff <janb@...amperecomputing.com>
Cc:     Yann Sionneau <ysionneau@...rayinc.com>,
        Wolfram Sang <wsa@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Yann Sionneau <yann@...nneau.net>,
        Will Deacon <will@...nel.org>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jan Dabros <jsd@...ihalf.com>,
        Andi Shyti <andi.shyti@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] i2c: designware: Fix corrupted memory seen in the ISR

On Wed, Sep 20, 2023 at 11:44:58AM +0100, Catalin Marinas wrote:
> On Tue, Sep 19, 2023 at 11:54:10AM -0700, Jan Bottorff wrote:
> > The ARM docs do have a specific example case where the device write triggers
> > an interrupt, and that example specifically says a DSB barrier is needed.
> 
> Yeah, the Arm ARM is not very precise here on what the mailbox is,
> whether it's a local or shared peripheral and they went for the
> stronger DMB. Will added a good explanation on why a DMB is sufficient
           ^^^
	   DSB

(fixing typo in my reply)

-- 
Catalin