Driver core: allow certain drivers prohibit bind/unbind via sysfs

Platform drivers registered via platform_driver_probe() can be bound
to devices only once, upon registration, because discard their probe()
routines to save memory. Unbinding the driver through sysfs 'unbind'
leaves the device stranded and confuses users so let's not create
bind and unbind attributes for such drivers.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Cc: Éric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 16 insertions, 7 deletions

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 973bf2ad4e0d..63c143e54a57 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -689,15 +689,19 @@ int bus_add_driver(struct device_driver *drv)
                 printk(KERN_ERR "%s: driver_add_attrs(%s) failed\n",
                         __func__, drv->name);
         }
-        error = add_bind_files(drv);
-        if (error) {
-                /* Ditto */
-                printk(KERN_ERR "%s: add_bind_files(%s) failed\n",
-                        __func__, drv->name);
+
+        if (!drv->suppress_bind_attrs) {
+                error = add_bind_files(drv);
+                if (error) {
+                        /* Ditto */
+                        printk(KERN_ERR "%s: add_bind_files(%s) failed\n",
+                                __func__, drv->name);
+                }
         }
 
         kobject_uevent(&priv->kobj, KOBJ_ADD);
         return 0;
+
 out_unregister:
         kfree(drv->p);
         drv->p = NULL;
@@ -720,7 +724,8 @@ void bus_remove_driver(struct device_driver *drv)
         if (!drv->bus)
                 return;
 
-        remove_bind_files(drv);
+        if (!drv->suppress_bind_attrs)
+                remove_bind_files(drv);
         driver_remove_attrs(drv->bus, drv);
         driver_remove_file(drv, &driver_attr_uevent);
         klist_remove(&drv->p->knode_bus);
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index ed156a13aa40..4fa954b07ac4 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -521,11 +521,15 @@ int __init_or_module platform_driver_probe(struct platform_driver *drv,
 {
         int retval, code;
 
+        /* make sure driver won't have bind/unbind attributes */
+        drv->driver.suppress_bind_attrs = true;
+
         /* temporary section violation during probe() */
         drv->probe = probe;
         retval = code = platform_driver_register(drv);
 
-        /* Fixup that section violation, being paranoid about code scanning
+        /*
+         * Fixup that section violation, being paranoid about code scanning
          * the list of drivers in order to probe new devices.  Check to see
          * if the probe was successful, and make sure any forced probes of
          * new devices fail.