sysdev: remove global sysdev drivers list

No one uses sysdev_drivers. Because no one calls sysdev_driver_register
with NULL class.

And it is difficult to imagine that someone want to implement a global
sysdev driver which is called with all sys_device on any kind of
sysdev_class.

So this patch removes global sysdev_drivers list and update comments
for this change.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Tejun Heo <htejun@gmail.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/sys.c b/drivers/base/sys.c
index 7ad8931..ac7ff6d 100644 (file)
--- a/drivers/base/sys.c
+++ b/drivers/base/sys.c
@@ -153,25 +153,22 @@ void sysdev_class_unregister(struct sysdev_class * cls)
 EXPORT_SYMBOL_GPL(sysdev_class_register);
 EXPORT_SYMBOL_GPL(sysdev_class_unregister);
 
-
-static LIST_HEAD(sysdev_drivers);
 static DEFINE_MUTEX(sysdev_drivers_lock);
 
 /**
  *     sysdev_driver_register - Register auxillary driver
- *     @cls:   Device class driver belongs to.
+ *     @cls:   Device class driver belongs to.
  *     @drv:   Driver.
  *
- *     If @cls is valid, then @drv is inserted into @cls->drivers to be
+ *     @drv is inserted into @cls->drivers to be
  *     called on each operation on devices of that class. The refcount
  *     of @cls is incremented.
- *     Otherwise, @drv is inserted into sysdev_drivers, and called for
- *     each device.
  */
 
-int sysdev_driver_register(struct sysdev_class * cls,
-                          struct sysdev_driver * drv)
+int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
 {
+       int err = 0;
+
        mutex_lock(&sysdev_drivers_lock);
        if (cls && kset_get(&cls->kset)) {
                list_add_tail(&drv->entry, &cls->drivers);
@@ -182,10 +179,13 @@ int sysdev_driver_register(struct sysdev_class * cls,
                        list_for_each_entry(dev, &cls->kset.list, kobj.entry)
                                drv->add(dev);
                }
-       } else
-               list_add_tail(&drv->entry, &sysdev_drivers);
+       } else {
+               err = -EINVAL;
+               printk(KERN_ERR "%s: invalid device class\n", __FUNCTION__);
+               WARN_ON(1);
+       }
        mutex_unlock(&sysdev_drivers_lock);
-       return 0;
+       return err;
 }
 
 
@@ -251,12 +251,6 @@ int sysdev_register(struct sys_device * sysdev)
                 * code that should have called us.
                 */
 
-               /* Notify global drivers */
-               list_for_each_entry(drv, &sysdev_drivers, entry) {
-                       if (drv->add)
-                               drv->add(sysdev);
-               }
-
                /* Notify class auxillary drivers */
                list_for_each_entry(drv, &cls->drivers, entry) {
                        if (drv->add)
@@ -272,11 +266,6 @@ void sysdev_unregister(struct sys_device * sysdev)
        struct sysdev_driver * drv;
 
        mutex_lock(&sysdev_drivers_lock);
-       list_for_each_entry(drv, &sysdev_drivers, entry) {
-               if (drv->remove)
-                       drv->remove(sysdev);
-       }
-
        list_for_each_entry(drv, &sysdev->cls->drivers, entry) {
                if (drv->remove)
                        drv->remove(sysdev);
@@ -293,7 +282,7 @@ void sysdev_unregister(struct sys_device * sysdev)
  *
  *     Loop over each class of system devices, and the devices in each
  *     of those classes. For each device, we call the shutdown method for
- *     each driver registered for the device - the globals, the auxillaries,
+ *     each driver registered for the device - the auxillaries,
  *     and the class driver.
  *
  *     Note: The list is iterated in reverse order, so that we shut down
@@ -320,13 +309,7 @@ void sysdev_shutdown(void)
                        struct sysdev_driver * drv;
                        pr_debug(" %s\n", kobject_name(&sysdev->kobj));
 
-                       /* Call global drivers first. */
-                       list_for_each_entry(drv, &sysdev_drivers, entry) {
-                               if (drv->shutdown)
-                                       drv->shutdown(sysdev);
-                       }
-
-                       /* Call auxillary drivers next. */
+                       /* Call auxillary drivers first */
                        list_for_each_entry(drv, &cls->drivers, entry) {
                                if (drv->shutdown)
                                        drv->shutdown(sysdev);
@@ -354,12 +337,6 @@ static void __sysdev_resume(struct sys_device *dev)
                if (drv->resume)
                        drv->resume(dev);
        }
-
-       /* Call global drivers. */
-       list_for_each_entry(drv, &sysdev_drivers, entry) {
-               if (drv->resume)
-                       drv->resume(dev);
-       }
 }
 
 /**
@@ -393,16 +370,7 @@ int sysdev_suspend(pm_message_t state)
                list_for_each_entry(sysdev, &cls->kset.list, kobj.entry) {
                        pr_debug(" %s\n", kobject_name(&sysdev->kobj));
 
-                       /* Call global drivers first. */
-                       list_for_each_entry(drv, &sysdev_drivers, entry) {
-                               if (drv->suspend) {
-                                       ret = drv->suspend(sysdev, state);
-                                       if (ret)
-                                               goto gbl_driver;
-                               }
-                       }
-
-                       /* Call auxillary drivers next. */
+                       /* Call auxillary drivers first */
                        list_for_each_entry(drv, &cls->drivers, entry) {
                                if (drv->suspend) {
                                        ret = drv->suspend(sysdev, state);
@@ -436,18 +404,7 @@ aux_driver:
                if (err_drv->resume)
                        err_drv->resume(sysdev);
        }
-       drv = NULL;
 
-gbl_driver:
-       if (drv)
-               printk(KERN_ERR "sysdev driver suspend failed for %s\n",
-                               kobject_name(&sysdev->kobj));
-       list_for_each_entry(err_drv, &sysdev_drivers, entry) {
-               if (err_drv == drv)
-                       break;
-               if (err_drv->resume)
-                       err_drv->resume(sysdev);
-       }
        /* resume other sysdevs in current class */
        list_for_each_entry(err_dev, &cls->kset.list, kobj.entry) {
                if (err_dev == sysdev)