Add "shutdown" to "struct class".

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@google.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org
Fixes: 74d6b3ceaa17 ("tpm: fix suspend/resume paths for TPM 2.0")
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 8dde934f8d15a2906a99a0835a76e5fb0c2c92bc..755451f684bcac6c2e94e3dcccfa279ce90cb80a 100644 (file)
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -2664,7 +2664,11 @@ void device_shutdown(void)
                pm_runtime_get_noresume(dev);
                pm_runtime_barrier(dev);
 
-               if (dev->bus && dev->bus->shutdown) {
+               if (dev->class && dev->class->shutdown) {
+                       if (initcall_debug)
+                               dev_info(dev, "shutdown\n");
+                       dev->class->shutdown(dev);
+               } else if (dev->bus && dev->bus->shutdown) {
                        if (initcall_debug)
                                dev_info(dev, "shutdown\n");
                        dev->bus->shutdown(dev);

diff --git a/include/linux/device.h b/include/linux/device.h
index 6baa1238f1580aae38e50eded4ef354f8e0faada..723cd54b94da84f95cd18934d14198b6d21040dd 100644 (file)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -375,6 +375,7 @@ 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.
@@ -403,6 +404,7 @@ 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);