[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>

1 files changed, 22 insertions, 4 deletions

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index e3f915a24891..29f6af554e71 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -428,6 +428,26 @@ static void driver_remove_attrs(struct bus_type * bus, struct device_driver * dr
         }
 }
 
+#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 * drv)
                 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 * drv)
 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);