1 files changed, 13 insertions, 4 deletions

diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 24e2347be6b1..8e9c98edc068 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -343,19 +343,25 @@ validate_group(struct perf_event *event)
 {
         struct perf_event *sibling, *leader = event->group_leader;
         struct pmu_hw_events fake_pmu;
+        DECLARE_BITMAP(fake_used_mask, ARMPMU_MAX_HWEVENTS);
 
-        memset(&fake_pmu, 0, sizeof(fake_pmu));
+        /*
+         * Initialise the fake PMU. We only need to populate the
+         * used_mask for the purposes of validation.
+         */
+        memset(fake_used_mask, 0, sizeof(fake_used_mask));
+        fake_pmu.used_mask = fake_used_mask;
 
         if (!validate_event(&fake_pmu, leader))
-                return -ENOSPC;
+                return -EINVAL;
 
         list_for_each_entry(sibling, &leader->sibling_list, group_entry) {
                 if (!validate_event(&fake_pmu, sibling))
-                        return -ENOSPC;
+                        return -EINVAL;
         }
 
         if (!validate_event(&fake_pmu, event))
-                return -ENOSPC;
+                return -EINVAL;
 
         return 0;
 }
@@ -396,6 +402,9 @@ armpmu_reserve_hardware(struct arm_pmu *armpmu)
         int i, err, irq, irqs;
         struct platform_device *pmu_device = armpmu->plat_device;
 
+        if (!pmu_device)
+                return -ENODEV;
+
         err = reserve_pmu(armpmu->type);
         if (err) {
                 pr_warning("unable to reserve pmu\n");