xen/evtchn: use rb_entry()

To make the code clearer, use rb_entry() instead of container_of() to
deal with rbtree.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>

diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index e8c7f09..6890897 100644 (file)
--- a/drivers/xen/evtchn.c
+++ b/drivers/xen/evtchn.c
@@ -125,7 +125,7 @@ static int add_evtchn(struct per_user_data *u, struct user_evtchn *evtchn)
        while (*new) {
                struct user_evtchn *this;
 
-               this = container_of(*new, struct user_evtchn, node);
+               this = rb_entry(*new, struct user_evtchn, node);
 
                parent = *new;
                if (this->port < evtchn->port)
@@ -157,7 +157,7 @@ static struct user_evtchn *find_evtchn(struct per_user_data *u, unsigned port)
        while (node) {
                struct user_evtchn *evtchn;
 
-               evtchn = container_of(node, struct user_evtchn, node);
+               evtchn = rb_entry(node, struct user_evtchn, node);
 
                if (evtchn->port < port)
                        node = node->rb_left;