From: Jean-Philippe Brucker jean-philippe@linaro.org
mainline inclusion from mainline-v5.7-rc3 commit 10f6cd2af21bb44faab31a50ec3361d7649e5a39 category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I4A1XO CVE: NA Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...
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Currently when trying to remove the SMMUv3 PMU module we get a WARN_ON_ONCE from free_irq(), because the affinity hint set during probe hasn't been properly cleared.
[ 238.878383] WARNING: CPU: 0 PID: 175 at kernel/irq/manage.c:1744 free_irq+0x324/0x358 ... [ 238.897263] Call trace: [ 238.897998] free_irq+0x324/0x358 [ 238.898792] devm_irq_release+0x18/0x28 [ 238.899189] release_nodes+0x1b0/0x228 [ 238.899984] devres_release_all+0x38/0x60 [ 238.900779] device_release_driver_internal+0x10c/0x1d0 [ 238.901574] driver_detach+0x50/0xe0 [ 238.902368] bus_remove_driver+0x5c/0xd8 [ 238.903448] driver_unregister+0x30/0x60 [ 238.903958] platform_driver_unregister+0x14/0x20 [ 238.905075] arm_smmu_pmu_exit+0x1c/0xecc [arm_smmuv3_pmu] [ 238.905547] __arm64_sys_delete_module+0x14c/0x260 [ 238.906342] el0_svc_common.constprop.0+0x74/0x178 [ 238.907355] do_el0_svc+0x24/0x90 [ 238.907932] el0_sync_handler+0x11c/0x198 [ 238.908979] el0_sync+0x158/0x180
Just like the other perf drivers, clear the affinity hint before releasing the device.
Fixes: 7d839b4b9e00 ("perf/smmuv3: Add arm64 smmuv3 pmu driver") Signed-off-by: Jean-Philippe Brucker jean-philippe@linaro.org Link: https://lore.kernel.org/r/20200422084805.237738-1-jean-philippe@linaro.org Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Qi Liu liuqi115@huawei.com Reviewed-by: Yang Jihong yangjihong1@huawei.com Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/perf/arm_smmuv3_pmu.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/perf/arm_smmuv3_pmu.c b/drivers/perf/arm_smmuv3_pmu.c index e3fba1baed2d2..0a88ec8bd57dd 100644 --- a/drivers/perf/arm_smmuv3_pmu.c +++ b/drivers/perf/arm_smmuv3_pmu.c @@ -841,6 +841,7 @@ static int smmu_pmu_probe(struct platform_device *pdev) out_unregister: cpuhp_state_remove_instance_nocalls(cpuhp_state_num, &smmu_pmu->node); out_cpuhp_err: + irq_set_affinity_hint(smmu_pmu->irq, NULL); return err; }
@@ -850,6 +851,7 @@ static int smmu_pmu_remove(struct platform_device *pdev)
perf_pmu_unregister(&smmu_pmu->pmu); cpuhp_state_remove_instance_nocalls(cpuhp_state_num, &smmu_pmu->node); + irq_set_affinity_hint(smmu_pmu->irq, NULL);
return 0; }