[PATCH 1/2] device model: Allow the creation of symlinks on /sys/bus/*/devices

[Cesar Eduardo Barros]

Allows the direct creation of symlinks on /sys/bus/*/devices. This is needed
for a compat symlink from gta01-pm-gps.0 to neo1973-pm-gps.0 on the Openmoko
Neo1973 GTA01.

Signed-off-by: Cesar Eduardo Barros <cesarb at cesarb.net>
---
 drivers/base/bus.c     |   23 +++++++++++++++++++++++
 include/linux/device.h |    5 +++++
 2 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index ef522ae..96d495d 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -141,6 +141,29 @@ void bus_remove_file(struct bus_type *bus, struct bus_attribute *attr)
 }
 EXPORT_SYMBOL_GPL(bus_remove_file);
 
+int bus_create_device_link(struct bus_type *bus, struct kobject *target,
+			   const char *name)
+{
+	int error;
+	if (bus_get(bus)) {
+		error = sysfs_create_link(&bus->p->devices_kset->kobj, target,
+					  name);
+		bus_put(bus);
+	} else
+		error = -EINVAL;
+	return error;
+}
+EXPORT_SYMBOL_GPL(bus_create_device_link);
+
+void bus_remove_device_link(struct bus_type *bus, const char *name)
+{
+	if (bus_get(bus)) {
+		sysfs_remove_link(&bus->p->devices_kset->kobj, name);
+		bus_put(bus);
+	}
+}
+EXPORT_SYMBOL_GPL(bus_remove_device_link);
+
 static struct kobj_type bus_ktype = {
 	.sysfs_ops	= &bus_sysfs_ops,
 };
diff --git a/include/linux/device.h b/include/linux/device.h
index 6a2d04c..d29b005 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -51,6 +51,11 @@ extern int __must_check bus_create_file(struct bus_type *,
 					struct bus_attribute *);
 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
 
+extern int __must_check bus_create_device_link(struct bus_type *bus,
+					       struct kobject *target,
+					       const char *name);
+extern void bus_remove_device_link(struct bus_type *bus, const char *name);
+
 struct bus_type {
 	const char		*name;
 	struct bus_attribute	*bus_attrs;
-- 
1.6.0.rc1