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

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Message-ID: <20201006193634.GB8771@duo.ucw.cz>
Date:   Tue, 6 Oct 2020 21:36:34 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Chris Packham <chris.packham@...iedtelesis.co.nz>,
        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.

Best regards,
								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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