linux-kernel - Re: [PATCH] mmc: core: Further prevent card detect during shutdown

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Message-ID: <CAPDyKFqQaPs1oQ9zgvOSBGLnP=tNe0UdX4B=EPELdY2jFjGRuQ@mail.gmail.com>
Date: Mon, 2 Dec 2024 16:23:36 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: linux-mmc@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>, 
	Anthony Pighin <anthony.pighin@...ia.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>, linux-kernel@...r.kernel.org, 
	stable@...r.kernel.org
Subject: Re: [PATCH] mmc: core: Further prevent card detect during shutdown

On Mon, 25 Nov 2024 at 13:24, Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> Disabling card detect from the host's ->shutdown_pre() callback turned out
> to not be the complete solution. More precisely, beyond the point when the
> mmc_bus->shutdown() has been called, to gracefully power off the card, we
> need to prevent card detect. Otherwise the mmc_rescan work may poll for the
> card with a CMD13, to see if it's still alive, which then will fail and
> hang as the card has already been powered off.
>
> To fix this problem, let's disable mmc_rescan prior to power off the card
> during shutdown.
>
> Reported-by: Anthony Pighin <anthony.pighin@...ia.com>
> Fixes: 66c915d09b94 ("mmc: core: Disable card detect during shutdown")
> Cc: stable@...r.kernel.org
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>

Applied for fixes and by adding a Closes tag, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/core/bus.c  | 2 ++
>  drivers/mmc/core/core.c | 3 +++
>  2 files changed, 5 insertions(+)
>
> diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
> index 9283b28bc69f..1cf64e0952fb 100644
> --- a/drivers/mmc/core/bus.c
> +++ b/drivers/mmc/core/bus.c
> @@ -149,6 +149,8 @@ static void mmc_bus_shutdown(struct device *dev)
>         if (dev->driver && drv->shutdown)
>                 drv->shutdown(card);
>
> +       __mmc_stop_host(host);
> +
>         if (host->bus_ops->shutdown) {
>                 ret = host->bus_ops->shutdown(host);
>                 if (ret)
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index a499f3c59de5..d996d39c0d6f 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -2335,6 +2335,9 @@ void mmc_start_host(struct mmc_host *host)
>
>  void __mmc_stop_host(struct mmc_host *host)
>  {
> +       if (host->rescan_disable)
> +               return;
> +
>         if (host->slot.cd_irq >= 0) {
>                 mmc_gpio_set_cd_wake(host, false);
>                 disable_irq(host->slot.cd_irq);
> --
> 2.43.0
>