3 files changed, 48 insertions, 6 deletions

diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index d6471bb6852f..19f93e114225 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -76,8 +76,9 @@ enum ec_command {
 enum {
         EC_FLAGS_QUERY_PENDING,         /* Query is pending */
         EC_FLAGS_GPE_STORM,             /* GPE storm detected */
-        EC_FLAGS_HANDLERS_INSTALLED     /* Handlers for GPE and
+        EC_FLAGS_HANDLERS_INSTALLED,    /* Handlers for GPE and
                                          * OpReg are installed */
+        EC_FLAGS_FROZEN,                /* Transactions are suspended */
 };
 
 /* If we find an EC via the ECDT, we need to keep a ptr to its context */
@@ -291,6 +292,10 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t)
         if (t->rdata)
                 memset(t->rdata, 0, t->rlen);
         mutex_lock(&ec->lock);
+        if (test_bit(EC_FLAGS_FROZEN, &ec->flags)) {
+                status = -EINVAL;
+                goto unlock;
+        }
         if (ec->global_lock) {
                 status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk);
                 if (ACPI_FAILURE(status)) {
@@ -445,6 +450,32 @@ int ec_transaction(u8 command,
 
 EXPORT_SYMBOL(ec_transaction);
 
+void acpi_ec_suspend_transactions(void)
+{
+        struct acpi_ec *ec = first_ec;
+
+        if (!ec)
+                return;
+
+        mutex_lock(&ec->lock);
+        /* Prevent transactions from being carried out */
+        set_bit(EC_FLAGS_FROZEN, &ec->flags);
+        mutex_unlock(&ec->lock);
+}
+
+void acpi_ec_resume_transactions(void)
+{
+        struct acpi_ec *ec = first_ec;
+
+        if (!ec)
+                return;
+
+        mutex_lock(&ec->lock);
+        /* Allow transactions to be carried out again */
+        clear_bit(EC_FLAGS_FROZEN, &ec->flags);
+        mutex_unlock(&ec->lock);
+}
+
 static int acpi_ec_query_unlocked(struct acpi_ec *ec, u8 * data)
 {
         int result;
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
index cb28e0502acc..78742460f1fc 100644
--- a/drivers/acpi/internal.h
+++ b/drivers/acpi/internal.h
@@ -51,6 +51,8 @@ void acpi_early_processor_set_pdc(void);
 int acpi_ec_init(void);
 int acpi_ec_ecdt_probe(void);
 int acpi_boot_ec_enable(void);
+void acpi_ec_suspend_transactions(void);
+void acpi_ec_resume_transactions(void);
 
 /*--------------------------------------------------------------------------
                                   Suspend/Resume
diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 79d33d908b5a..f01f8e84fd3d 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -552,8 +552,17 @@ static void acpi_hibernation_leave(void)
         hibernate_nvs_restore();
 }
 
-static void acpi_pm_enable_gpes(void)
+static int acpi_pm_pre_restore(void)
 {
+        acpi_disable_all_gpes();
+        acpi_os_wait_events_complete(NULL);
+        acpi_ec_suspend_transactions();
+        return 0;
+}
+
+static void acpi_pm_restore_cleanup(void)
+{
+        acpi_ec_resume_transactions();
         acpi_enable_all_runtime_gpes();
 }
 
@@ -565,8 +574,8 @@ static struct platform_hibernation_ops acpi_hibernation_ops = {
         .prepare = acpi_pm_prepare,
         .enter = acpi_hibernation_enter,
         .leave = acpi_hibernation_leave,
-        .pre_restore = acpi_pm_disable_gpes,
-        .restore_cleanup = acpi_pm_enable_gpes,
+        .pre_restore = acpi_pm_pre_restore,
+        .restore_cleanup = acpi_pm_restore_cleanup,
 };
 
 /**
@@ -618,8 +627,8 @@ static struct platform_hibernation_ops acpi_hibernation_ops_old = {
         .prepare = acpi_pm_disable_gpes,
         .enter = acpi_hibernation_enter,
         .leave = acpi_hibernation_leave,
-        .pre_restore = acpi_pm_disable_gpes,
-        .restore_cleanup = acpi_pm_enable_gpes,
+        .pre_restore = acpi_pm_pre_restore,
+        .restore_cleanup = acpi_pm_restore_cleanup,
         .recover = acpi_pm_finish,
 };
 #endif /* CONFIG_HIBERNATION */