linux-kernel - Re: [PATCH 4.19 21/38] spi: fsl-espi: Only process interrupts for expected events

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Date:   Mon, 12 Oct 2020 00:03:37 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc:     Pavel Machek <pavel@...x.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 21/38] spi: fsl-espi: Only process interrupts for
 expected events

Hi!

> >> [ Upstream commit b867eef4cf548cd9541225aadcdcee644669b9e1 ]
> >>
> >> The SPIE register contains counts for the TX FIFO so any time the irq
> >> handler was invoked we would attempt to process the RX/TX fifos. Use the
> >> SPIM value to mask the events so that we only process interrupts that
> >> were expected.
> >>
> >> This was a latent issue exposed by commit 3282a3da25bd ("powerpc/64:
> >> Implement soft interrupt replay in C").
> > We don't seem to have commit 3282... in 4.19, so we don't need this
> > one in 4.19-stable according to the changelog.
> Technically 3282... exposed the issue by making it more likely to happen 
> so 4.19 might just have a really low probability of seeing the issue (I 
> think I did try reproducing it on kernels of that vintage). Personally 
> I'm not too fussed the kernel versions I care about have the fix. Maybe 
> someone from NXP cares enough to pursue it.

Okay, I guess low-probability bugs are still fair game for
-stable. The commit was not dropped from 4.19, so nothing needs to be
done here.

Sorry for the noise,
								Pavel
-- 
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

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