Unbinding and rebinding the ARM PMU driver via sysfs leads to a
warning followed by more errors:
WARNING: CPU: 0 PID: 217 at kernel/irq/chip.c:1034
irq_modify_status+0x150/0x16c
..
genirq: Flags mismatch irq 19. 00010c04 (arm-pmu) vs. 00010c04 (arm-pmu)
hw perfevents: unable to request IRQ19 for ARM PMU counters
hw perfevents: /pmu: failed to register PMU devices!
armv7-pmu: probe of pmu failed with error -16
The driver is clearly not designed to be removed. Disable bind/
unbind for this driver.
Signed-off-by: Stefan Agner <ste...@agner.ch>
---
arch/arm/kernel/perf_event_v7.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c
index 57f01e059f39..5a5116794440 100644
--- a/arch/arm/kernel/perf_event_v7.c
+++ b/arch/arm/kernel/perf_event_v7.c
@@ -2030,6 +2030,7 @@ static struct platform_driver armv7_pmu_driver = {
.driver = {
.name = "armv7-pmu",
.of_match_table = armv7_pmu_of_device_ids,
+ .suppress_bind_attrs = true,
},
.probe = armv7_pmu_device_probe,
};
--
2.18.0
