core/cgroup: actually make use of the cached accounting values

If cgroup is already gone, i.e. CGRuntime.cgroup_path is NULL,
do not return -ENODATA prematurely, but check for cached values
first.

For #33149

diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index dfbe716e8bd4347e34d2aa6d7ce787ddfcc1d41b..cfcf8ab1174ed828f4d2fd48a030ee9a869e3b77 100644 (file)
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -4645,11 +4645,11 @@ int unit_get_cpu_usage(Unit *u, nsec_t *ret) {
          * started. If the cgroup has been removed already, returns the last cached value. To cache the value, simply
          * call this function with a NULL return value. */
 
-        CGroupRuntime *crt = unit_get_cgroup_runtime(u);
-        if (!crt || !crt->cgroup_path)
+        if (!UNIT_CGROUP_BOOL(u, cpu_accounting))
                 return -ENODATA;
 
-        if (!UNIT_CGROUP_BOOL(u, cpu_accounting))
+        CGroupRuntime *crt = unit_get_cgroup_runtime(u);
+        if (!crt)
                 return -ENODATA;
 
         r = unit_get_cpu_usage_raw(u, crt, &ns);
@@ -4693,7 +4693,7 @@ int unit_get_ip_accounting(
                 return -ENODATA;
 
         CGroupRuntime *crt = unit_get_cgroup_runtime(u);
-        if (!crt || !crt->cgroup_path)
+        if (!crt)
                 return -ENODATA;
 
         fd = IN_SET(metric, CGROUP_IP_INGRESS_BYTES, CGROUP_IP_INGRESS_PACKETS) ?
@@ -4873,7 +4873,7 @@ int unit_get_io_accounting(
                 return -ENODATA;
 
         CGroupRuntime *crt = unit_get_cgroup_runtime(u);
-        if (!crt || !crt->cgroup_path)
+        if (!crt)
                 return -ENODATA;
 
         if (allow_cache && crt->io_accounting_last[metric] != UINT64_MAX)