don't decrement below zero

diff --git a/kernel/ckrm/ckrm_numtasks.c b/kernel/ckrm/ckrm_numtasks.c
index 7b02a6c..c058305 100644 (file)
--- a/kernel/ckrm/ckrm_numtasks.c
+++ b/kernel/ckrm/ckrm_numtasks.c
@@ -165,7 +165,12 @@ static void numtasks_put_ref_local(struct ckrm_core_class *core)
        res = ckrm_get_res_class(core, resid, struct ckrm_numtasks);
        if (res == NULL)
                return;
+
+       if (atomic_read(&res->cnt_cur_alloc)==0)
+               return;
+
        atomic_dec(&res->cnt_cur_alloc);
+
        if (atomic_read(&res->cnt_borrowed) > 0) {
                atomic_dec(&res->cnt_borrowed);
                numtasks_put_ref_local(res->parent);