linux-kernel - Re: [PATCH] mmc: brcmstb: Fix sdhci_pltfm

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Date:   Mon, 25 Jan 2021 09:40:16 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>, Al Cooper <alcooperx@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        bcm-kernel-feedback-list@...adcom.com,
        Nicolas Schichan <nschichan@...ebox.fr>
Cc:     Arnd Bergmann <arnd@...db.de>, stable@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: brcmstb: Fix sdhci_pltfm_suspend link error

+Nicolas,

On 1/25/2021 4:50 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> sdhci_pltfm_suspend() is only available when CONFIG_PM_SLEEP
> support is built into the kernel, which caused a regression
> in a recent bugfix:
> 
> ld.lld: error: undefined symbol: sdhci_pltfm_suspend
>>>> referenced by sdhci-brcmstb.c
>>>>               mmc/host/sdhci-brcmstb.o:(sdhci_brcmstb_shutdown) in archive drivers/built-in.a
> 
> Making the call conditional on the symbol fixes the link
> error.
> 
> Fixes: 5b191dcba719 ("mmc: sdhci-brcmstb: Fix mmc timeout errors on S5 suspend")
> Fixes: e7b5d63a82fe ("mmc: sdhci-brcmstb: Add shutdown callback")
> Cc: stable@...r.kernel.org
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> It would be helpful if someone could test this to ensure that the
> driver works correctly even when CONFIG_PM_SLEEP is disabled

Why not create stubs for sdhci_pltfm_suspend() when CONFIG_PM_SLEEP=n? I
don't think this is going to be a functional issue given that the
purpose of having the .shutdown() function is to save power if we cannot
that is fine, too.
-- 
Florian