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Diffstat (limited to 'arch/arm/kernel/perf_event.c')
-rw-r--r--arch/arm/kernel/perf_event.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index 24e2347be6b1..88b0941ce51e 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");
@@ -631,6 +640,9 @@ static struct platform_device_id armpmu_plat_device_ids[] = {
static int __devinit armpmu_device_probe(struct platform_device *pdev)
{
+ if (!cpu_pmu)
+ return -ENODEV;
+
cpu_pmu->plat_device = pdev;
return 0;
}