Merge branch 'bind_unbind' into driver-core-next

This merges the bind_unbind driver core feature into the
driver-core-next branch.  bind_unbind is a branch so that others can
pull and work off of it safely.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 132 insertions, 0 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index 755451f684bc..cb4b5b1f1b09 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1023,12 +1023,144 @@ int device_add_groups(struct device *dev, const struct attribute_group **groups)
 {
         return sysfs_create_groups(&dev->kobj, groups);
 }
+EXPORT_SYMBOL_GPL(device_add_groups);
 
 void device_remove_groups(struct device *dev,
                           const struct attribute_group **groups)
 {
         sysfs_remove_groups(&dev->kobj, groups);
 }
+EXPORT_SYMBOL_GPL(device_remove_groups);
+
+union device_attr_group_devres {
+        const struct attribute_group *group;
+        const struct attribute_group **groups;
+};
+
+static int devm_attr_group_match(struct device *dev, void *res, void *data)
+{
+        return ((union device_attr_group_devres *)res)->group == data;
+}
+
+static void devm_attr_group_remove(struct device *dev, void *res)
+{
+        union device_attr_group_devres *devres = res;
+        const struct attribute_group *group = devres->group;
+
+        dev_dbg(dev, "%s: removing group %p\n", __func__, group);
+        sysfs_remove_group(&dev->kobj, group);
+}
+
+static void devm_attr_groups_remove(struct device *dev, void *res)
+{
+        union device_attr_group_devres *devres = res;
+        const struct attribute_group **groups = devres->groups;
+
+        dev_dbg(dev, "%s: removing groups %p\n", __func__, groups);
+        sysfs_remove_groups(&dev->kobj, groups);
+}
+
+/**
+ * devm_device_add_group - given a device, create a managed attribute group
+ * @dev:        The device to create the group for
+ * @grp:        The attribute group to create
+ *
+ * This function creates a group for the first time.  It will explicitly
+ * warn and error if any of the attribute files being created already exist.
+ *
+ * Returns 0 on success or error code on failure.
+ */
+int devm_device_add_group(struct device *dev, const struct attribute_group *grp)
+{
+        union device_attr_group_devres *devres;
+        int error;
+
+        devres = devres_alloc(devm_attr_group_remove,
+                              sizeof(*devres), GFP_KERNEL);
+        if (!devres)
+                return -ENOMEM;
+
+        error = sysfs_create_group(&dev->kobj, grp);
+        if (error) {
+                devres_free(devres);
+                return error;
+        }
+
+        devres->group = grp;
+        devres_add(dev, devres);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(devm_device_add_group);
+
+/**
+ * devm_device_remove_group: remove a managed group from a device
+ * @dev:        device to remove the group from
+ * @grp:        group to remove
+ *
+ * This function removes a group of attributes from a device. The attributes
+ * previously have to have been created for this group, otherwise it will fail.
+ */
+void devm_device_remove_group(struct device *dev,
+                              const struct attribute_group *grp)
+{
+        WARN_ON(devres_release(dev, devm_attr_group_remove,
+                               devm_attr_group_match,
+                               /* cast away const */ (void *)grp));
+}
+EXPORT_SYMBOL_GPL(devm_device_remove_group);
+
+/**
+ * devm_device_add_groups - create a bunch of managed attribute groups
+ * @dev:        The device to create the group for
+ * @groups:     The attribute groups to create, NULL terminated
+ *
+ * This function creates a bunch of managed attribute groups.  If an error
+ * occurs when creating a group, all previously created groups will be
+ * removed, unwinding everything back to the original state when this
+ * function was called.  It will explicitly warn and error if any of the
+ * attribute files being created already exist.
+ *
+ * Returns 0 on success or error code from sysfs_create_group on failure.
+ */
+int devm_device_add_groups(struct device *dev,
+                           const struct attribute_group **groups)
+{
+        union device_attr_group_devres *devres;
+        int error;
+
+        devres = devres_alloc(devm_attr_groups_remove,
+                              sizeof(*devres), GFP_KERNEL);
+        if (!devres)
+                return -ENOMEM;
+
+        error = sysfs_create_groups(&dev->kobj, groups);
+        if (error) {
+                devres_free(devres);
+                return error;
+        }
+
+        devres->groups = groups;
+        devres_add(dev, devres);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(devm_device_add_groups);
+
+/**
+ * devm_device_remove_groups - remove a list of managed groups
+ *
+ * @dev:        The device for the groups to be removed from
+ * @groups:     NULL terminated list of groups to be removed
+ *
+ * If groups is not NULL, remove the specified groups from the device.
+ */
+void devm_device_remove_groups(struct device *dev,
+                               const struct attribute_group **groups)
+{
+        WARN_ON(devres_release(dev, devm_attr_groups_remove,
+                               devm_attr_group_match,
+                               /* cast away const */ (void *)groups));
+}
+EXPORT_SYMBOL_GPL(devm_device_remove_groups);
 
 static int device_add_attrs(struct device *dev)
 {