diff options
| author | Marc Zyngier <marc.zyngier@arm.com> | 2017-10-03 19:14:13 +0200 |
|---|---|---|
| committer | Pawel Moll <pawel.moll@arm.com> | 2017-12-04 17:56:43 +0100 |
| commit | 4608af8aa53e7f3922ddee695d023b7bcd5cb35b (patch) | |
| tree | cb83385efc4205ba08196961b4d9e35283d41974 | |
| parent | bus: arm-ccn: Fix use of smp_processor_id() in preemptible context (diff) | |
| download | linux-4608af8aa53e7f3922ddee695d023b7bcd5cb35b.tar.xz linux-4608af8aa53e7f3922ddee695d023b7bcd5cb35b.zip | |
bus: arm-cci: Fix use of smp_processor_id() in preemptible context
The ARM CCI driver seem to be using smp_processor_id() in a
preemptible context, which is likely to make a DEBUG_PREMPT
kernel scream at boot time.
Turn this into a get_cpu()/put_cpu() that extends over the CPU
hotplug registration, making sure that we don't race against
a CPU down operation.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Cc: stable@vger.kernel.org # 4.2+
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
| -rw-r--r-- | drivers/bus/arm-cci.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c index 3c29d36702a8..5426c04fe24b 100644 --- a/drivers/bus/arm-cci.c +++ b/drivers/bus/arm-cci.c @@ -1755,14 +1755,17 @@ static int cci_pmu_probe(struct platform_device *pdev) raw_spin_lock_init(&cci_pmu->hw_events.pmu_lock); mutex_init(&cci_pmu->reserve_mutex); atomic_set(&cci_pmu->active_events, 0); - cpumask_set_cpu(smp_processor_id(), &cci_pmu->cpus); + cpumask_set_cpu(get_cpu(), &cci_pmu->cpus); ret = cci_pmu_init(cci_pmu, pdev); - if (ret) + if (ret) { + put_cpu(); return ret; + } cpuhp_state_add_instance_nocalls(CPUHP_AP_PERF_ARM_CCI_ONLINE, &cci_pmu->node); + put_cpu(); pr_info("ARM %s PMU driver probed", cci_pmu->model->name); return 0; } |