[Xen-changelog] [xen-unstable] waitqueue: Hold a reference to a domain on a waitqueue.

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1322253125 0
# Node ID 95d4e2e0bed374602b5a78ee004b057ad8715d65
# Parent  2a81ce2b2b9374adc051768fcf940d161ecc34dd
waitqueue: Hold a reference to a domain on a waitqueue.

Also allow waitqueues to be dynamically destroyed.

Signed-off-by: Keir Fraser <keir@xxxxxxx>
---


diff -r 2a81ce2b2b93 -r 95d4e2e0bed3 xen/common/wait.c
--- a/xen/common/wait.c Fri Nov 25 20:27:11 2011 +0000
+++ b/xen/common/wait.c Fri Nov 25 20:32:05 2011 +0000
@@ -87,6 +87,11 @@
     INIT_LIST_HEAD(&wq->list);
 }
 
+void destroy_waitqueue_head(struct waitqueue_head *wq)
+{
+    wake_up_all(wq);
+}
+
 void wake_up_nr(struct waitqueue_head *wq, unsigned int nr)
 {
     struct waitqueue_vcpu *wqv;
@@ -98,6 +103,7 @@
         wqv = list_entry(wq->list.next, struct waitqueue_vcpu, list);
         list_del_init(&wqv->list);
         vcpu_unpause(wqv->vcpu);
+        put_domain(wqv->vcpu->domain);
     }
 
     spin_unlock(&wq->lock);
@@ -218,6 +224,7 @@
     spin_lock(&wq->lock);
     list_add_tail(&wqv->list, &wq->list);
     vcpu_pause_nosync(curr);
+    get_knownalive_domain(curr->domain);
     spin_unlock(&wq->lock);
 }
 
@@ -236,6 +243,7 @@
     {
         list_del_init(&wqv->list);
         vcpu_unpause(curr);
+        put_domain(curr->domain);
     }
     spin_unlock(&wq->lock);
 }
diff -r 2a81ce2b2b93 -r 95d4e2e0bed3 xen/include/xen/wait.h
--- a/xen/include/xen/wait.h    Fri Nov 25 20:27:11 2011 +0000
+++ b/xen/include/xen/wait.h    Fri Nov 25 20:32:05 2011 +0000
@@ -25,8 +25,9 @@
         .list = LIST_HEAD_INIT((name).list)     \
     }
 
-/* Dynamically initialise a waitqueue. */
+/* Dynamically initialise/destroy a waitqueue. */
 void init_waitqueue_head(struct waitqueue_head *wq);
+void destroy_waitqueue_head(struct waitqueue_head *wq);
 
 /* Wake VCPU(s) waiting on specified waitqueue. */
 void wake_up_nr(struct waitqueue_head *wq, unsigned int nr);

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