linux-kernel - Re: [PATCH] i2c: imx: Fix external abort on early interrupt

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Message-ID: <20200612095604.GA17763@ninjato>
Date:   Fri, 12 Jun 2020 11:56:04 +0200
From:   Wolfram Sang <wsa@...nel.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Oleksij Rempel <linux@...pel-privat.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Gao Pan <b54642@...escale.com>,
        Fugang Duan <B38611@...escale.com>, linux-i2c@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] i2c: imx: Fix external abort on early interrupt

On Fri, Jun 12, 2020 at 11:29:41AM +0200, Krzysztof Kozlowski wrote:
> On Fri, Jun 12, 2020 at 11:05:17AM +0200, Wolfram Sang wrote:
> > On Wed, Jun 10, 2020 at 03:46:42PM +0200, Krzysztof Kozlowski wrote:
> > > If interrupt comes early (could be triggered with CONFIG_DEBUG_SHIRQ),
> > 
> > That code is disabled since 2011 (6d83f94db95c ("genirq: Disable the
> > SHIRQ_DEBUG call in request_threaded_irq for now"))? So, you had this
> > without fake injection, I assume?
> 
> No, I observed it only after enabling DEBUG_SHIRQ (to a kernel with
> some debugging options already).

Interesting. Maybe probe was deferred and you got the extra irq when
deregistering?


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