linux-kernel - Re: [PATCH] mmc: sdhci-msm: When dev_pm_opp_of_add

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Message-ID: <CA+G9fYtWpBQb8Ew_G=bjcR7wBHMgKm=EXV7vuk6FE9m0-4Ef3A@mail.gmail.com>
Date:   Fri, 28 Aug 2020 01:57:25 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, vbadigan@...eaurora.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH] mmc: sdhci-msm: When dev_pm_opp_of_add_table() returns 0
 it's not an error

On Thu, 27 Aug 2020 at 21:03, Douglas Anderson <dianders@...omium.org> wrote:
>
> The commit d05a7238fe1c ("mmc: sdhci-msm: Unconditionally call
> dev_pm_opp_of_remove_table()") works fine in the case where there is
> no OPP table.  However, if there is an OPP table then
> dev_pm_opp_of_add_table() will return 0.  Since 0 != -ENODEV then the
> "if (ret != -ENODEV)" will evaluate to true and we'll fall into the
> error case.  Oops.
>
> Let's fix this.
>
> Fixes: d05a7238fe1c ("mmc: sdhci-msm: Unconditionally call dev_pm_opp_of_remove_table()")
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>

I will test this patch and report again on this email thread.

> ---
>
>  drivers/mmc/host/sdhci-msm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index b7e47107a31a..55101dba42bd 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -2284,7 +2284,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
>
>         /* OPP table is optional */
>         ret = dev_pm_opp_of_add_table(&pdev->dev);
> -       if (ret != -ENODEV) {
> +       if (ret && ret != -ENODEV) {
>                 dev_err(&pdev->dev, "Invalid OPP table in Device tree\n");
>                 goto opp_cleanup;
>         }
> --
> 2.28.0.297.g1956fa8f8d-goog
>

- Naresh