Hi,
some atomic operations are only atomic, not ordered. Thus a CPU is allowed
to reorder memory references to an object to before the reference is
obtained. This fixes it.
Regards
Oliver
Signed-off-by: Oliver Neukum <[EMAIL PROTECTED]>
------
--- a/lib/kref.c 2007-04-02 14:40:40.000000000 +0200
+++ b/lib/kref.c 2007-04-02 14:40:50.000000000 +0200
@@ -21,6 +21,7 @@
void kref_init(struct kref *kref)
{
atomic_set(&kref->refcount,1);
+ smp_mb();
}
/**
@@ -31,6 +32,7 @@
{
WARN_ON(!atomic_read(&kref->refcount));
atomic_inc(&kref->refcount);
+ smp_mb__after_atomic_inc();
}
/**
-
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