[pve-devel] [PATCH common] fix #5529: cgroup: correctly handle change_cpu_quota without a quota

[Wolfgang Bumiller]

The function can be called with
- neither quota nor period
- only a period (quota will be 'max')
- both

$quota was therefore defaulted to 'max' and the check for whether
values were provided should use $period instead of $quota.
Also move the defaulting-assignment into the condition for clarity.

Signed-off-by: Wolfgang Bumiller <w.bumiller at proxmox.com>
---
 src/PVE/CGroup.pm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/PVE/CGroup.pm b/src/PVE/CGroup.pm
index e2839cf..4d523e2 100644
--- a/src/PVE/CGroup.pm
+++ b/src/PVE/CGroup.pm
@@ -469,8 +469,8 @@ sub change_cpu_quota {
     } elsif ($ver == 2) {
 	# cgroupv2 environment, an undefined (unlimited) quota is defined as "max"
 	# in this interface:
-	$quota //= 'max'; # unlimited
-	if (defined($quota)) {
+	if (defined($period)) {
+	    $quota //= 'max'; # unlimited
 	    PVE::ProcFSTools::write_proc_entry("$path/cpu.max", "$quota $period");
 	} else {
 	    # we're allowed to only write the quota:
-- 
2.39.2