diff options
Diffstat (limited to 'drivers/perf')
| -rw-r--r-- | drivers/perf/arm_pmu_acpi.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c index 34c862f213c7..0a9b78705ee8 100644 --- a/drivers/perf/arm_pmu_acpi.c +++ b/drivers/perf/arm_pmu_acpi.c @@ -29,6 +29,17 @@ static int arm_pmu_acpi_register_irq(int cpu) return -EINVAL; gsi = gicc->performance_interrupt; + + /* + * Per the ACPI spec, the MADT cannot describe a PMU that doesn't + * have an interrupt. QEMU advertises this by using a GSI of zero, + * which is not known to be valid on any hardware despite being + * valid per the spec. Take the pragmatic approach and reject a + * GSI of zero for now. + */ + if (!gsi) + return 0; + if (gicc->flags & ACPI_MADT_PERFORMANCE_IRQ_MODE) trigger = ACPI_EDGE_SENSITIVE; else |