This is a note to let you know that I've just added the patch titled
mmc: core: Disable card detect during shutdown
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-core-disable-card-detect-during-shutdown.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 66c915d09b942fb3b2b0cb2f56562180901fba17 Mon Sep 17 00:00:00 2001
From: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Date: Fri, 3 Dec 2021 15:15:54 +0100
Subject: mmc: core: Disable card detect during shutdown
From: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
commit 66c915d09b942fb3b2b0cb2f56562180901fba17 upstream.
It's seems prone to problems by allowing card detect and its corresponding
mmc_rescan() work to run, during platform shutdown. For example, we may end
up turning off the power while initializing a card, which potentially could
damage it.
To avoid this scenario, let's add ->shutdown_pre() callback for the mmc host
class device and then turn of the card detect from there.
Reported-by: Al Cooper <alcooperx@xxxxxxxxx>
Suggested-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20211203141555.105351-1-ulf.hansson@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/core.c | 7 ++++++-
drivers/mmc/core/core.h | 1 +
drivers/mmc/core/host.c | 9 +++++++++
3 files changed, 16 insertions(+), 1 deletion(-)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2264,7 +2264,7 @@ void mmc_start_host(struct mmc_host *hos
_mmc_detect_change(host, 0, false);
}
-void mmc_stop_host(struct mmc_host *host)
+void __mmc_stop_host(struct mmc_host *host)
{
if (host->slot.cd_irq >= 0) {
mmc_gpio_set_cd_wake(host, false);
@@ -2273,6 +2273,11 @@ void mmc_stop_host(struct mmc_host *host
host->rescan_disable = 1;
cancel_delayed_work_sync(&host->detect);
+}
+
+void mmc_stop_host(struct mmc_host *host)
+{
+ __mmc_stop_host(host);
/* clear pm flags now and let card drivers set them as needed */
host->pm_flags = 0;
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -70,6 +70,7 @@ static inline void mmc_delay(unsigned in
void mmc_rescan(struct work_struct *work);
void mmc_start_host(struct mmc_host *host);
+void __mmc_stop_host(struct mmc_host *host);
void mmc_stop_host(struct mmc_host *host);
void _mmc_detect_change(struct mmc_host *host, unsigned long delay,
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -80,9 +80,18 @@ static void mmc_host_classdev_release(st
kfree(host);
}
+static int mmc_host_classdev_shutdown(struct device *dev)
+{
+ struct mmc_host *host = cls_dev_to_mmc_host(dev);
+
+ __mmc_stop_host(host);
+ return 0;
+}
+
static struct class mmc_host_class = {
.name = "mmc_host",
.dev_release = mmc_host_classdev_release,
+ .shutdown_pre = mmc_host_classdev_shutdown,
.pm = MMC_HOST_CLASS_DEV_PM_OPS,
};
Patches currently in stable-queue which might be from ulf.hansson@xxxxxxxxxx are
queue-5.15/mmc-mmci-stm32-clear-dlyb_cr-after-sending-tuning-command.patch
queue-5.15/mmc-meson-mx-sdhc-set-manual_stop-for-multi-block-sdio-commands.patch
queue-5.15/pm-sleep-fix-error-handling-in-dpm_prepare.patch
queue-5.15/mmc-core-disable-card-detect-during-shutdown.patch
queue-5.15/mmc-sdhci-tegra-fix-switch-to-hs400es-mode.patch
