[PATCH 08/27] arm_mpam: resctrl: Correct check that existing class is L3

[James Morse <james.morse@arm.com>]

From: Ben Horgan <ben.horgan@arm.com>

The class used to back mbm_total_bytes can be either at the L3 or the
memory. If a platform had candidate classes at both the memory and the L3
then, as the check for whether the existing class is L3 or not in
counter_update_class() is broken, the class that will be chosen depends on
which order the classes are considered and so the probe order.

Fix the check.

Fixes: 1458c4f05335 ("arm_mpam: resctrl: Add support for csu counters")
Tested-by: Gavin Shan <gshan@redhat.com>
Signed-off-by: Ben Horgan <ben.horgan@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: James Morse <james.morse@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
 drivers/resctrl/mpam_resctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/resctrl/mpam_resctrl.c b/drivers/resctrl/mpam_resctrl.c
index 9d223057953a..b825bd90d4bd 100644
--- a/drivers/resctrl/mpam_resctrl.c
+++ b/drivers/resctrl/mpam_resctrl.c
@@ -1076,7 +1076,7 @@ static void counter_update_class(enum resctrl_event_id evt_id,
 	struct mpam_class *existing_class = mpam_resctrl_counters[evt_id].class;
 
 	if (existing_class) {
-		if (class->level == 3) {
+		if (existing_class->level == 3) {
 			pr_debug("Existing class is L3 - L3 wins\n");
 			return;
 		}
-- 
2.53.0