linux-kernel - Re: [PATCH] spi: spi-geni-qcom: Speculative fix of "nobody cared" about interrupt

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Message-ID: <20200317121018.GB3971@sirena.org.uk>
Date:   Tue, 17 Mar 2020 12:10:18 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Alok Chauhan <alokc@...eaurora.org>,
        Dilip Kota <dkota@...eaurora.org>, skakit@...eaurora.org,
        Girish Mahadevan <girishm@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-spi@...r.kernel.org
Subject: Re: [PATCH] spi: spi-geni-qcom: Speculative fix of "nobody cared"
 about interrupt

On Mon, Mar 16, 2020 at 03:20:01PM -0700, Douglas Anderson wrote:

> +	/*
> +	 * We don't expect to hit this, but if we do we should try our best
> +	 * to clear the interrupts and return so we don't just get called
> +	 * again.
> +	 */
> +	if (mas->cur_mcmd == CMD_NONE)
> +		goto exit;
> +

Does this mean that there was an actual concrete message of type
CMD_NONE or does it mean that there was no message waiting?  If there
was no message then isn't the interrupt spurious?

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