[SPARC64]: Fix race between MD update and dr-cpu add.

We need to make sure the MD update occurs before we try to
process dr-cpu configure requests.  MD update and dr-cpu
were being processed by seperate threads so that did not
happen occaisionally.

Fix this by executing all domain services data packets from
a single thread, in order.

This will help simplify some other things as well.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 13 deletions

diff --git a/arch/sparc64/kernel/mdesc.c b/arch/sparc64/kernel/mdesc.c
index 62a389793949..de5310ffdb48 100644
--- a/arch/sparc64/kernel/mdesc.c
+++ b/arch/sparc64/kernel/mdesc.c
@@ -214,7 +214,7 @@ void mdesc_release(struct mdesc_handle *hp)
 }
 EXPORT_SYMBOL(mdesc_release);
 
-static void do_mdesc_update(struct work_struct *work)
+void mdesc_update(void)
 {
         unsigned long len, real_len, status;
         struct mdesc_handle *hp, *orig_hp;
@@ -248,13 +248,6 @@ static void do_mdesc_update(struct work_struct *work)
         spin_unlock_irqrestore(&mdesc_lock, flags);
 }
 
-static DECLARE_WORK(mdesc_update_work, do_mdesc_update);
-
-void mdesc_update(void)
-{
-        schedule_work(&mdesc_update_work);
-}
-
 static struct mdesc_elem *node_block(struct mdesc_hdr *mdesc)
 {
         return (struct mdesc_elem *) (mdesc + 1);
@@ -278,13 +271,14 @@ u64 mdesc_node_by_name(struct mdesc_handle *hp,
         u64 last_node = hp->mdesc.node_sz / 16;
         u64 ret;
 
-        if (from_node == MDESC_NODE_NULL)
-                from_node = 0;
-
-        if (from_node >= last_node)
+        if (from_node == MDESC_NODE_NULL) {
+                ret = from_node = 0;
+        } else if (from_node >= last_node) {
                 return MDESC_NODE_NULL;
+        } else {
+                ret = ep[from_node].d.val;
+        }
 
-        ret = ep[from_node].d.val;
         while (ret < last_node) {
                 if (ep[ret].tag != MD_NODE)
                         return MDESC_NODE_NULL;