From: Pawel Moll <pawel.moll@arm.com>
Date: Thu, 15 Oct 2015 13:32:45 +0000 (+0100)
Subject: bus: arm-ccn: Handle correctly no-more-cpus case
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b20519fd5007908c6a816cab1b9db911915e9fbd;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

bus: arm-ccn: Handle correctly no-more-cpus case

When migrating events the driver picks another cpu using
cpumask_any_but() function, which returns value >= nr_cpu_ids
when there is none available, not a negative value as the code
assumed. Fixed now.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Pawel Moll <pawel.moll@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---

diff --git a/drivers/bus/arm-ccn.c b/drivers/bus/arm-ccn.c
index 7d9879e166cf..cc322fbde9af 100644
--- a/drivers/bus/arm-ccn.c
+++ b/drivers/bus/arm-ccn.c
@@ -1184,7 +1184,7 @@ static int arm_ccn_pmu_cpu_notifier(struct notifier_block *nb,
 		if (!cpumask_test_and_clear_cpu(cpu, &dt->cpu))
 			break;
 		target = cpumask_any_but(cpu_online_mask, cpu);
-		if (target < 0)
+		if (target >= nr_cpu_ids)
 			break;
 		perf_pmu_migrate_context(&dt->pmu, cpu, target);
 		cpumask_set_cpu(target, &dt->cpu);