[S390] ccwgroup: cleanup

Fix coding style, remove forward declerations, simplify code.
Also remove a superfluous get_device/put_device pair in
ccwgroup_create_from_string.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 119 insertions, 180 deletions

diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index cda9bd6e48e8..4f1989d27b1f 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -29,31 +29,20 @@
 
 /* a device matches a driver if all its slave devices match the same
  * entry of the driver */
-static int
-ccwgroup_bus_match (struct device * dev, struct device_driver * drv)
+static int ccwgroup_bus_match(struct device *dev, struct device_driver * drv)
 {
-        struct ccwgroup_device *gdev;
-        struct ccwgroup_driver *gdrv;
-
-        gdev = to_ccwgroupdev(dev);
-        gdrv = to_ccwgroupdrv(drv);
+        struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
+        struct ccwgroup_driver *gdrv = to_ccwgroupdrv(drv);
 
         if (gdev->creator_id == gdrv->driver_id)
                 return 1;
 
         return 0;
 }
-static int
-ccwgroup_uevent (struct device *dev, struct kobj_uevent_env *env)
-{
-        /* TODO */
-        return 0;
-}
 
 static struct bus_type ccwgroup_bus_type;
 
-static void
-__ccwgroup_remove_symlinks(struct ccwgroup_device *gdev)
+static void __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev)
 {
         int i;
         char str[8];
@@ -63,7 +52,6 @@ __ccwgroup_remove_symlinks(struct ccwgroup_device *gdev)
                 sysfs_remove_link(&gdev->dev.kobj, str);
                 sysfs_remove_link(&gdev->cdev[i]->dev.kobj, "group_device");
         }
-        
 }
 
 /*
@@ -87,12 +75,87 @@ static void __ccwgroup_remove_cdev_refs(struct ccwgroup_device *gdev)
         }
 }
 
+static int ccwgroup_set_online(struct ccwgroup_device *gdev)
+{
+        struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
+        int ret = 0;
+
+        if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
+                return -EAGAIN;
+        if (gdev->state == CCWGROUP_ONLINE)
+                goto out;
+        if (gdrv->set_online)
+                ret = gdrv->set_online(gdev);
+        if (ret)
+                goto out;
+
+        gdev->state = CCWGROUP_ONLINE;
+out:
+        atomic_set(&gdev->onoff, 0);
+        return ret;
+}
+
+static int ccwgroup_set_offline(struct ccwgroup_device *gdev)
+{
+        struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
+        int ret = 0;
+
+        if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
+                return -EAGAIN;
+        if (gdev->state == CCWGROUP_OFFLINE)
+                goto out;
+        if (gdrv->set_offline)
+                ret = gdrv->set_offline(gdev);
+        if (ret)
+                goto out;
+
+        gdev->state = CCWGROUP_OFFLINE;
+out:
+        atomic_set(&gdev->onoff, 0);
+        return ret;
+}
+
 static ssize_t ccwgroup_online_store(struct device *dev,
                                      struct device_attribute *attr,
-                                     const char *buf, size_t count);
+                                     const char *buf, size_t count)
+{
+        struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
+        struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
+        unsigned long value;
+        int ret;
+
+        if (!dev->driver)
+                return -EINVAL;
+        if (!try_module_get(gdrv->driver.owner))
+                return -EINVAL;
+
+        ret = strict_strtoul(buf, 0, &value);
+        if (ret)
+                goto out;
+
+        if (value == 1)
+                ret = ccwgroup_set_online(gdev);
+        else if (value == 0)
+                ret = ccwgroup_set_offline(gdev);
+        else
+                ret = -EINVAL;
+out:
+        module_put(gdrv->driver.owner);
+        return (ret == 0) ? count : ret;
+}
+
 static ssize_t ccwgroup_online_show(struct device *dev,
                                     struct device_attribute *attr,
-                                    char *buf);
+                                    char *buf)
+{
+        struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
+        int online;
+
+        online = (gdev->state == CCWGROUP_ONLINE) ? 1 : 0;
+
+        return scnprintf(buf, PAGE_SIZE, "%d\n", online);
+}
+
 /*
  * Provide an 'ungroup' attribute so the user can remove group devices no
  * longer needed or accidentially created. Saves memory :)
@@ -110,14 +173,13 @@ static void ccwgroup_ungroup_callback(struct device *dev)
         mutex_unlock(&gdev->reg_mutex);
 }
 
-static ssize_t
-ccwgroup_ungroup_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
+static ssize_t ccwgroup_ungroup_store(struct device *dev,
+                                      struct device_attribute *attr,
+                                      const char *buf, size_t count)
 {
-        struct ccwgroup_device *gdev;
+        struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
         int rc;
 
-        gdev = to_ccwgroupdev(dev);
-
         /* Prevent concurrent online/offline processing and ungrouping. */
         if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
                 return -EAGAIN;
@@ -138,7 +200,6 @@ out:
         }
         return count;
 }
-
 static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store);
 static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store);
 
@@ -155,21 +216,19 @@ static const struct attribute_group *ccwgroup_attr_groups[] = {
         NULL,
 };
 
-static void
-ccwgroup_release (struct device *dev)
+static void ccwgroup_release(struct device *dev)
 {
         kfree(to_ccwgroupdev(dev));
 }
 
-static int
-__ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
+static int __ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
 {
         char str[8];
         int i, rc;
 
         for (i = 0; i < gdev->count; i++) {
-                rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj, &gdev->dev.kobj,
-                                       "group_device");
+                rc = sysfs_create_link(&gdev->cdev[i]->dev.kobj,
+                                       &gdev->dev.kobj, "group_device");
                 if (rc) {
                         for (--i; i >= 0; i--)
                                 sysfs_remove_link(&gdev->cdev[i]->dev.kobj,
@@ -179,8 +238,8 @@ __ccwgroup_create_symlinks(struct ccwgroup_device *gdev)
         }
         for (i = 0; i < gdev->count; i++) {
                 sprintf(str, "cdev%d", i);
-                rc = sysfs_create_link(&gdev->dev.kobj, &gdev->cdev[i]->dev.kobj,
-                                       str);
+                rc = sysfs_create_link(&gdev->dev.kobj,
+                                       &gdev->cdev[i]->dev.kobj, str);
                 if (rc) {
                         for (--i; i >= 0; i--) {
                                 sprintf(str, "cdev%d", i);
@@ -317,14 +376,13 @@ int ccwgroup_create_from_string(struct device *root, unsigned int creator_id,
         rc = device_add(&gdev->dev);
         if (rc)
                 goto error;
-        get_device(&gdev->dev);
         rc = __ccwgroup_create_symlinks(gdev);
-        if (!rc) {
-                mutex_unlock(&gdev->reg_mutex);
-                put_device(&gdev->dev);
-                return 0;
+        if (rc) {
+                device_del(&gdev->dev);
+                goto error;
         }
-        device_unregister(&gdev->dev);
+        mutex_unlock(&gdev->reg_mutex);
+        return 0;
 error:
         for (i = 0; i < num_devices; i++)
                 if (gdev->cdev[i]) {
@@ -342,7 +400,15 @@ error:
 EXPORT_SYMBOL(ccwgroup_create_from_string);
 
 static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action,
-                             void *data);
+                             void *data)
+{
+        struct device *dev = data;
+
+        if (action == BUS_NOTIFY_UNBIND_DRIVER)
+                device_schedule_callback(dev, ccwgroup_ungroup_callback);
+
+        return NOTIFY_OK;
+}
 
 static struct notifier_block ccwgroup_nb = {
         .notifier_call = ccwgroup_notifier
@@ -374,128 +440,21 @@ module_exit(cleanup_ccwgroup);
 
 /************************** driver stuff ******************************/
 
-static int
-ccwgroup_set_online(struct ccwgroup_device *gdev)
-{
-        struct ccwgroup_driver *gdrv;
-        int ret;
-
-        if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
-                return -EAGAIN;
-        if (gdev->state == CCWGROUP_ONLINE) {
-                ret = 0;
-                goto out;
-        }
-        if (!gdev->dev.driver) {
-                ret = -EINVAL;
-                goto out;
-        }
-        gdrv = to_ccwgroupdrv (gdev->dev.driver);
-        if ((ret = gdrv->set_online ? gdrv->set_online(gdev) : 0))
-                goto out;
-
-        gdev->state = CCWGROUP_ONLINE;
- out:
-        atomic_set(&gdev->onoff, 0);
-        return ret;
-}
-
-static int
-ccwgroup_set_offline(struct ccwgroup_device *gdev)
-{
-        struct ccwgroup_driver *gdrv;
-        int ret;
-
-        if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
-                return -EAGAIN;
-        if (gdev->state == CCWGROUP_OFFLINE) {
-                ret = 0;
-                goto out;
-        }
-        if (!gdev->dev.driver) {
-                ret = -EINVAL;
-                goto out;
-        }
-        gdrv = to_ccwgroupdrv (gdev->dev.driver);
-        if ((ret = gdrv->set_offline ? gdrv->set_offline(gdev) : 0))
-                goto out;
-
-        gdev->state = CCWGROUP_OFFLINE;
- out:
-        atomic_set(&gdev->onoff, 0);
-        return ret;
-}
-
-static ssize_t
-ccwgroup_online_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
-{
-        struct ccwgroup_device *gdev;
-        struct ccwgroup_driver *gdrv;
-        unsigned long value;
-        int ret;
-
-        if (!dev->driver)
-                return -EINVAL;
-
-        gdev = to_ccwgroupdev(dev);
-        gdrv = to_ccwgroupdrv(dev->driver);
-
-        if (!try_module_get(gdrv->driver.owner))
-                return -EINVAL;
-
-        ret = strict_strtoul(buf, 0, &value);
-        if (ret)
-                goto out;
-
-        if (value == 1)
-                ret = ccwgroup_set_online(gdev);
-        else if (value == 0)
-                ret = ccwgroup_set_offline(gdev);
-        else
-                ret = -EINVAL;
-out:
-        module_put(gdrv->driver.owner);
-        return (ret == 0) ? count : ret;
-}
-
-static ssize_t
-ccwgroup_online_show (struct device *dev, struct device_attribute *attr, char *buf)
+static int ccwgroup_probe(struct device *dev)
 {
-        int online;
-
-        online = (to_ccwgroupdev(dev)->state == CCWGROUP_ONLINE);
-
-        return sprintf(buf, online ? "1\n" : "0\n");
-}
-
-static int
-ccwgroup_probe (struct device *dev)
-{
-        struct ccwgroup_device *gdev;
-        struct ccwgroup_driver *gdrv;
-
-        int ret;
-
-        gdev = to_ccwgroupdev(dev);
-        gdrv = to_ccwgroupdrv(dev->driver);
-
-        ret = gdrv->probe ? gdrv->probe(gdev) : -ENODEV;
+        struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
+        struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
 
-        return ret;
+        return gdrv->probe ? gdrv->probe(gdev) : -ENODEV;
 }
 
-static int
-ccwgroup_remove (struct device *dev)
+static int ccwgroup_remove(struct device *dev)
 {
-        struct ccwgroup_device *gdev;
-        struct ccwgroup_driver *gdrv;
+        struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
+        struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
 
         if (!dev->driver)
                 return 0;
-
-        gdev = to_ccwgroupdev(dev);
-        gdrv = to_ccwgroupdrv(dev->driver);
-
         if (gdrv->remove)
                 gdrv->remove(gdev);
 
@@ -504,15 +463,11 @@ ccwgroup_remove (struct device *dev)
 
 static void ccwgroup_shutdown(struct device *dev)
 {
-        struct ccwgroup_device *gdev;
-        struct ccwgroup_driver *gdrv;
+        struct ccwgroup_device *gdev = to_ccwgroupdev(dev);
+        struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver);
 
         if (!dev->driver)
                 return;
-
-        gdev = to_ccwgroupdev(dev);
-        gdrv = to_ccwgroupdrv(dev->driver);
-
         if (gdrv->shutdown)
                 gdrv->shutdown(gdev);
 }
@@ -588,26 +543,12 @@ static const struct dev_pm_ops ccwgroup_pm_ops = {
 static struct bus_type ccwgroup_bus_type = {
         .name   = "ccwgroup",
         .match  = ccwgroup_bus_match,
-        .uevent = ccwgroup_uevent,
         .probe  = ccwgroup_probe,
         .remove = ccwgroup_remove,
         .shutdown = ccwgroup_shutdown,
         .pm = &ccwgroup_pm_ops,
 };
 
-
-static int ccwgroup_notifier(struct notifier_block *nb, unsigned long action,
-                             void *data)
-{
-        struct device *dev = data;
-
-        if (action == BUS_NOTIFY_UNBIND_DRIVER)
-                device_schedule_callback(dev, ccwgroup_ungroup_callback);
-
-        return NOTIFY_OK;
-}
-
-
 /**
  * ccwgroup_driver_register() - register a ccw group driver
  * @cdriver: driver to be registered
@@ -621,9 +562,9 @@ int ccwgroup_driver_register(struct ccwgroup_driver *cdriver)
 
         return driver_register(&cdriver->driver);
 }
+EXPORT_SYMBOL(ccwgroup_driver_register);
 
-static int
-__ccwgroup_match_all(struct device *dev, void *data)
+static int __ccwgroup_match_all(struct device *dev, void *data)
 {
         return 1;
 }
@@ -654,6 +595,7 @@ void ccwgroup_driver_unregister(struct ccwgroup_driver *cdriver)
         put_driver(&cdriver->driver);
         driver_unregister(&cdriver->driver);
 }
+EXPORT_SYMBOL(ccwgroup_driver_unregister);
 
 /**
  * ccwgroup_probe_ccwdev() - probe function for slave devices
@@ -668,6 +610,7 @@ int ccwgroup_probe_ccwdev(struct ccw_device *cdev)
 {
         return 0;
 }
+EXPORT_SYMBOL(ccwgroup_probe_ccwdev);
 
 /**
  * ccwgroup_remove_ccwdev() - remove function for slave devices
@@ -704,9 +647,5 @@ void ccwgroup_remove_ccwdev(struct ccw_device *cdev)
         /* Release ccwgroup device reference for local processing. */
         put_device(&gdev->dev);
 }
-
-MODULE_LICENSE("GPL");
-EXPORT_SYMBOL(ccwgroup_driver_register);
-EXPORT_SYMBOL(ccwgroup_driver_unregister);
-EXPORT_SYMBOL(ccwgroup_probe_ccwdev);
 EXPORT_SYMBOL(ccwgroup_remove_ccwdev);
+MODULE_LICENSE("GPL");