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.
Signed-off-by: Al Cooper <alcooperx@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
---
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(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 240c5af793dc..368f10405e13 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2264,7 +2264,7 @@ void mmc_start_host(struct mmc_host *host)
_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;
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index 7931a4f0137d..f5f3f623ea49 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -70,6 +70,7 @@ static inline void mmc_delay(unsigned int ms)
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,
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index d4683b1d263f..cf140f4ec864 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -80,9 +80,18 @@ static void mmc_host_classdev_release(struct device *dev)
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,
};
--
2.25.1
