driver core: Add deferred_probe attribute to devices in sysfs

It is sometimes useful to know that a device is on the deferred probe
list rather than, say, not having a driver available.  Expose this
information to user-space.

Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index d0c9df5cdd9e..b8b2f6105476 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1060,8 +1060,14 @@ static int device_add_attrs(struct device *dev)
                         goto err_remove_dev_groups;
         }
 
+        error = device_create_file(dev, &dev_attr_deferred_probe);
+        if (error)
+                goto err_remove_online;
+
         return 0;
 
+ err_remove_online:
+        device_remove_file(dev, &dev_attr_online);
  err_remove_dev_groups:
         device_remove_groups(dev, dev->groups);
  err_remove_type_groups:
@@ -1079,6 +1085,7 @@ static void device_remove_attrs(struct device *dev)
         struct class *class = dev->class;
         const struct device_type *type = dev->type;
 
+        device_remove_file(dev, &dev_attr_deferred_probe);
         device_remove_file(dev, &dev_attr_online);
         device_remove_groups(dev, dev->groups);