8381 Convert ipsec_alg_lock from mutex to rwlock

@@ -19,10 +19,11 @@
  * CDDL HEADER END
  */
 /*
  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
+ * Copyright (c) 2012 Nexenta Systems, Inc. All rights reserved.
  */
 
 #ifndef _INET_IPSEC_IMPL_H
 #define _INET_IPSEC_IMPL_H
 

@@ -783,11 +784,11 @@
 /* spd.c */
         /*
          * Because policy needs to know what algorithms are supported, keep the
          * lists of algorithms here.
          */
-        kmutex_t                ipsec_alg_lock;
+        krwlock_t               ipsec_alg_lock;
 
         uint8_t                 ipsec_nalgs[IPSEC_NALGTYPES];
         ipsec_alginfo_t *ipsec_alglists[IPSEC_NALGTYPES][IPSEC_MAX_ALGS];
 
         uint8_t         ipsec_sortlist[IPSEC_NALGTYPES][IPSEC_MAX_ALGS];