[PATCH v4 2/2] Add "shutdown" to "struct class".

[Josh Zimmerman <joshz-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>]

The TPM class has some common shutdown code that must be executed for
all drivers. This adds some needed functionality for that.

Signed-off-by: Josh Zimmerman <joshz-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Acked-by: Greg Kroah-Hartman <gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org>
Cc: stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org

-----
v2: Add Signed-off-by.
v3: Remove logically separate change.
v4: Add "acked-by" and "cc".
---
 drivers/base/core.c    | 5 +++++
 include/linux/device.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 6bb60fb6a30b..687668d9afbe 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2667,6 +2667,11 @@ void device_shutdown(void)
                pm_runtime_get_noresume(dev);
                pm_runtime_barrier(dev);

+               if (dev->class && dev->class->shutdown) {
+                       if (initcall_debug)
+                               dev_info(dev, "shutdown\n");
+                       dev->class->shutdown(dev);
+               }
                if (dev->bus && dev->bus->shutdown) {
                        if (initcall_debug)
                                dev_info(dev, "shutdown\n");
diff --git a/include/linux/device.h b/include/linux/device.h
index 9ef518af5515..f240baac2001 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -378,6 +378,7 @@ int subsys_virtual_register(struct bus_type *subsys,
  * @suspend:   Used to put the device to sleep mode, usually to a low power
  *             state.
  * @resume:    Used to bring the device from the sleep mode.
+ * @shutdown:  Called at shut-down time to quiesce the device.
  * @ns_type:   Callbacks so sysfs can detemine namespaces.
  * @namespace: Namespace of the device belongs to this class.
  * @pm:                The default device power management operations
of this class.
@@ -407,6 +408,7 @@ struct class {

        int (*suspend)(struct device *dev, pm_message_t state);
        int (*resume)(struct device *dev);
+       int (*shutdown)(struct device *dev);

        const struct kobj_ns_type_operations *ns_type;
        const void *(*namespace)(struct device *dev);
-- 
2.13.0.219.gdb65acc882-goog

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