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

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Message-ID: <20241125122446.18684-1-ulf.hansson@linaro.org>
Date: Mon, 25 Nov 2024 13:24:46 +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: [PATCH] mmc: core: Further prevent card detect during shutdown

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>
---
 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