1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00.h b/drivers/net/wireless/rt2x00/rt2x00.h
index 31e48c25a692..ba874cff8648 100644
--- a/drivers/net/wireless/rt2x00/rt2x00.h
+++ b/drivers/net/wireless/rt2x00/rt2x00.h
@@ -623,7 +623,7 @@ struct rt2x00_dev {
          * required for deregistration of debugfs.
          */
 #ifdef CONFIG_RT2X00_LIB_DEBUGFS
-        const struct rt2x00debug_intf *debugfs_intf;
+        struct rt2x00debug_intf *debugfs_intf;
 #endif /* CONFIG_RT2X00_LIB_DEBUGFS */
 
         /*
@@ -791,6 +791,12 @@ struct rt2x00_dev {
         ring_loop(__entry, (__dev)->tx, ring_end(__dev))
 
 /*
+ * Compute an array index from a pointer to an element and the base pointer.
+ */
+#define ARRAY_INDEX(__elem, __base) \
+        ( ((char *)(__elem) - (char *)(__base)) / sizeof(*(__elem)) )
+
+/*
  * Generic RF access.
  * The RF is being accessed by word index.
  */