linux-kernel - Re: [PATCH v2] spi: spi-geni-qcom: Speculative fix of "nobody cared" about interrupt

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Date:   Mon, 23 Mar 2020 09:32:39 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     kbuild@...ts.01.org, kbuild-all@...ts.01.org,
        Mark Brown <broonie@...nel.org>,
        Alok Chauhan <alokc@...eaurora.org>, skakit@...eaurora.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Girish Mahadevan <girishm@...eaurora.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>
Subject: Re: [PATCH v2] spi: spi-geni-qcom: Speculative fix of "nobody cared"
 about interrupt

Hi,

On Mon, Mar 23, 2020 at 4:08 AM Dan Carpenter <dan.carpenter@...cle.com> wrote:
>
> 561de45f72bd5f Girish Mahadevan 2018-10-03  327                 ret = get_spi_clk_cfg(xfer->speed_hz, mas, &idx, &div);
> 561de45f72bd5f Girish Mahadevan 2018-10-03  328                 if (ret) {
> 561de45f72bd5f Girish Mahadevan 2018-10-03  329                         dev_err(mas->dev, "Err setting clks:%d\n", ret);
> 561de45f72bd5f Girish Mahadevan 2018-10-03  330                         return;
>
> Needs to drop the lock before returning.

Oops, thanks for catching.  I will wait before spinning a v3 until
there is some clarity about whether folks want to do something more
like Stephen suggested or whether I should continue with my strategy.
At the moment I'm still in favor of keeping w/ my strategy and seeing
if I can reduce the amount of time with interrupts disabled in
setup_fifo_xfer(), maybe just grabbing the lock around the start of
the transfer to keep the state machine in sync with the kickoff...

-Doug