[PATCH] Driver core: only all userspace bind/unbind if CONFIG_HOTPLUG is enabled

[Greg KH <gregkh@suse.de>]

[PATCH] Driver core: only all userspace bind/unbind if CONFIG_HOTPLUG is enabled

Thanks to drivers making their id tables __devinit, we can't allow
userspace to bind or unbind drivers from devices manually through sysfs.
So we only allow this if CONFIG_HOTPLUG is enabled.

Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
commit 874c6241b2e49e52680d32a50d4909c7768d5cb9
tree 815b08ab6793cd45346c3d5f6a3875f36c0bfc91
parent a96b204208443ab7e23c681f7ddabe807a741d0c
author Greg Kroah-Hartman <gregkh@suse.de> Tue, 13 Dec 2005 15:17:34 -0800
committer Greg Kroah-Hartman <gregkh@suse.de> Wed, 04 Jan 2006 16:18:09 -0800

 drivers/base/bus.c |   26 ++++++++++++++++++++++----
 1 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index e3f915a..29f6af5 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -428,6 +428,26 @@ static void driver_remove_attrs(struct b
 	}
 }
 
+#ifdef CONFIG_HOTPLUG
+/*
+ * Thanks to drivers making their tables __devinit, we can't allow manual
+ * bind and unbind from userspace unless CONFIG_HOTPLUG is enabled.
+ */
+static void add_bind_files(struct device_driver *drv)
+{
+	driver_create_file(drv, &driver_attr_unbind);
+	driver_create_file(drv, &driver_attr_bind);
+}
+
+static void remove_bind_files(struct device_driver *drv)
+{
+	driver_remove_file(drv, &driver_attr_bind);
+	driver_remove_file(drv, &driver_attr_unbind);
+}
+#else
+static inline void add_bind_files(struct device_driver *drv) {}
+static inline void remove_bind_files(struct device_driver *drv) {}
+#endif
 
 /**
  *	bus_add_driver - Add a driver to the bus.
@@ -457,8 +477,7 @@ int bus_add_driver(struct device_driver 
 		module_add_driver(drv->owner, drv);
 
 		driver_add_attrs(bus, drv);
-		driver_create_file(drv, &driver_attr_unbind);
-		driver_create_file(drv, &driver_attr_bind);
+		add_bind_files(drv);
 	}
 	return error;
 }
@@ -476,8 +495,7 @@ int bus_add_driver(struct device_driver 
 void bus_remove_driver(struct device_driver * drv)
 {
 	if (drv->bus) {
-		driver_remove_file(drv, &driver_attr_bind);
-		driver_remove_file(drv, &driver_attr_unbind);
+		remove_bind_files(drv);
 		driver_remove_attrs(drv->bus, drv);
 		klist_remove(&drv->knode_bus);
 		pr_debug("bus %s: remove driver %s\n", drv->bus->name, drv->name);