[backfire] package/mac80211: backport list_for_each_entry_continue_rcu to fix carl1970

git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@23716 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/mac80211/patches/900-backport_list_for_each_entry_continue_rcu.patch b/package/mac80211/patches/900-backport_list_for_each_entry_continue_rcu.patch
new file mode 100644 (file)
index 0000000..4e2d9c9
--- /dev/null
+++ b/package/mac80211/patches/900-backport_list_for_each_entry_continue_rcu.patch
@@ -0,0 +1,47 @@
+diff --git a/include/linux/compat-2.6.31.h b/include/linux/compat-2.6.31.h
+index 54ddefd..6c454cb 100644
+--- a/include/linux/compat-2.6.31.h
++++ b/include/linux/compat-2.6.31.h
+@@ -191,6 +191,17 @@ void compat_synchronize_threaded_irq(struct compat_threaded_irq *comp)
+       cancel_work_sync(&comp->work);
+ }
+ 
++/**
++ * list_entry_rcu - get the struct for this entry
++ * @ptr:        the &struct list_head pointer.
++ * @type:       the type of the struct this is embedded in.
++ * @member:     the name of the list_struct within the struct.
++ *
++ * This primitive may safely run concurrently with the _rcu list-mutation
++ * primitives such as list_add_rcu() as long as it's guarded by rcu_read_lock().
++ */
++#define list_entry_rcu(ptr, type, member) \
++      container_of(rcu_dereference(ptr), type, member)
+ 
+ #endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31)) */
+ 
+diff --git a/include/linux/compat-2.6.33.h b/include/linux/compat-2.6.33.h
+index e4dff72..e7e20d9 100644
+--- a/include/linux/compat-2.6.33.h
++++ b/include/linux/compat-2.6.33.h
+@@ -98,6 +98,20 @@ int pccard_loop_tuple(struct pcmcia_socket *s, unsigned int function,
+ #define kfifo_out(a, b, c) __kfifo_get(*a, b, c)
+ #define kfifo_len(a) __kfifo_len(*a)
+ 
++/**
++ * list_for_each_entry_continue_rcu - continue iteration over list of given type
++ * @pos:      the type * to use as a loop cursor.
++ * @head:     the head for your list.
++ * @member:   the name of the list_struct within the struct.
++ *
++ * Continue to iterate over list of given type, continuing after
++ * the current position.
++ */
++#define list_for_each_entry_continue_rcu(pos, head, member)           \
++      for (pos = list_entry_rcu(pos->member.next, typeof(*pos), member); \
++           prefetch(pos->member.next), &pos->member != (head);        \
++           pos = list_entry_rcu(pos->member.next, typeof(*pos), member))
++
+ #endif /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)) */
+ 
+ #endif /* LINUX_26_33_COMPAT_H */