| Message ID | 20241125122446.18684-1-ulf.hansson@linaro.org |
|---|---|
| State | New |
| Headers | show |
| Series | mmc: core: Further prevent card detect during shutdown | expand |
On Tue, 26 Nov 2024 at 12:57, Adrian Hunter <adrian.hunter@intel.com> wrote: > > On 25/11/24 14:24, Ulf Hansson 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@nokia.com> > > Could add a closes tag here Good point, I will add it when applying! > > > Fixes: 66c915d09b94 ("mmc: core: Disable card detect during shutdown") > > Cc: stable@vger.kernel.org > > Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> > > Reviewed-by: Adrian Hunter <adrian.hunter@intel.com> 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); >
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);
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@nokia.com> Fixes: 66c915d09b94 ("mmc: core: Disable card detect during shutdown") Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> --- drivers/mmc/core/bus.c | 2 ++ drivers/mmc/core/core.c | 3 +++ 2 files changed, 5 insertions(+)