2 files changed, 5 insertions, 17 deletions
diff --git a/src/core/nginx.h b/src/core/nginx.h
index 5ad6aff45..daac21e2c 100644
--- a/src/core/nginx.h
+++ b/src/core/nginx.h
@@ -9,8 +9,8 @@
 #define _NGINX_H_INCLUDED_
 
 
-#define nginx_version      1021005
-#define NGINX_VERSION      "1.21.5"
+#define nginx_version      1021006
+#define NGINX_VERSION      "1.21.6"
 #define NGINX_VER          "nginx/" NGINX_VERSION
 
 #ifdef NGX_BUILD
diff --git a/src/core/ngx_rwlock.c b/src/core/ngx_rwlock.c
index ed2b0f810..e7da8a8ec 100644
--- a/src/core/ngx_rwlock.c
+++ b/src/core/ngx_rwlock.c
@@ -89,22 +89,10 @@ ngx_rwlock_rlock(ngx_atomic_t *lock)
 void
 ngx_rwlock_unlock(ngx_atomic_t *lock)
 {
-    ngx_atomic_uint_t  readers;
-
-    readers = *lock;
-
-    if (readers == NGX_RWLOCK_WLOCK) {
+    if (*lock == NGX_RWLOCK_WLOCK) {
         (void) ngx_atomic_cmp_set(lock, NGX_RWLOCK_WLOCK, 0);
-        return;
-    }
-
-    for ( ;; ) {
-
-        if (ngx_atomic_cmp_set(lock, readers, readers - 1)) {
-            return;
-        }
-
-        readers = *lock;
+    } else {
+        (void) ngx_atomic_fetch_add(lock, -1);
     }
 }