From: Keir Fraser <keir.fraser@citrix.com>
Date: Sat, 24 Nov 2007 13:27:59 +0000 (+0000)
Subject: [Mini-OS] Make wake_up callback-safe
X-Git-Tag: xen-3.2.0-rc1~10
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=bab44af1417ffe80d51723232d43c4bb81e6088f;p=mini-os.git

[Mini-OS] Make wake_up callback-safe

As it may compete with event handlers waking wait queues, wake_up
needs to be callback-safe.

Signed-off-by: Samuel Thibault <samuel.thibault@citrix.com>
---

diff --git a/include/wait.h b/include/wait.h
index b7af396..6bd4d0c 100644
--- a/include/wait.h
+++ b/include/wait.h
@@ -58,13 +58,16 @@ static inline void remove_wait_queue(struct wait_queue *q)
 
 static inline void wake_up(struct wait_queue_head *head)
 {
+    unsigned long flags;
     struct list_head *tmp, *next;
+    local_irq_save(flags);
     list_for_each_safe(tmp, next, &head->thread_list)
     {
          struct wait_queue *curr;
          curr = list_entry(tmp, struct wait_queue, thread_list);
          wake(curr->thread);
     }
+    local_irq_restore(flags);
 }
 
 #define add_waiter(w, wq) do {  \