linux-kernel - [PATCH 3.2 072/164] mmc: core: add missing pm event in mmc_pm

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Date:	Sun, 02 Aug 2015 01:02:37 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Grygorii Strashko" <Grygorii.Strashko@...aro.org>,
	"Ulf Hansson" <ulf.hansson@...aro.org>
Subject: [PATCH 3.2 072/164] mmc: core: add missing pm event in
 mmc_pm_notify to fix hib restore

3.2.70-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Grygorii Strashko <Grygorii.Strashko@...aro.org>

commit 184af16b09360d6273fd6160e6ff7f8e2482ef23 upstream.

The PM_RESTORE_PREPARE is not handled now in mmc_pm_notify(),
as result mmc_rescan() could be scheduled and executed at
late hibernation restore stages when MMC device is suspended
already - which, in turn, will lead to system crash on TI dra7-evm board:

WARNING: CPU: 0 PID: 3188 at drivers/bus/omap_l3_noc.c:148 l3_interrupt_handler+0x258/0x374()
44000000.ocp:L3 Custom Error: MASTER MPU TARGET L4_PER1_P3 (Idle): Data Access in User mode during Functional access

Hence, add missed PM_RESTORE_PREPARE PM event in mmc_pm_notify().

Fixes: 4c2ef25fe0b8 (mmc: fix all hangs related to mmc/sd card...)
Signed-off-by: Grygorii Strashko <Grygorii.Strashko@...aro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/mmc/core/core.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2424,6 +2424,7 @@ int mmc_pm_notify(struct notifier_block
 	switch (mode) {
 	case PM_HIBERNATION_PREPARE:
 	case PM_SUSPEND_PREPARE:
+	case PM_RESTORE_PREPARE:
 
 		spin_lock_irqsave(&host->lock, flags);
 		host->rescan_disable = 1;

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