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>

1 files changed, 14 insertions, 57 deletions

diff --git a/drivers/base/sys.c b/drivers/base/sys.c
index 7ad893167823..ac7ff6d0c6e5 100644
--- 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)