perf: arm_cspmu: Set irq affinitiy only if overflow interrupt is used

[ Upstream commit 225d757012e0afa673d8c862e6fb39ed2f429b4d ]

Don't try to set irq affinity if PMU doesn't have an overflow interrupt.

Fixes: e37dfd65731d ("perf: arm_cspmu: Add support for ARM CoreSight PMU driver")
Signed-off-by: Ilkka Koskinen <ilkka@os.amperecomputing.com>
Link: https://lore.kernel.org/r/20230608203742.3503486-1-ilkka@os.amperecomputing.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
index e31302ab7e37c3b4decbcf8c230e467e2c836f68..c1b6f4bdb04af36515db46371fa0bc485c202c05 100644 (file)
--- a/drivers/perf/arm_cspmu/arm_cspmu.c
+++ b/drivers/perf/arm_cspmu/arm_cspmu.c
@@ -1230,7 +1230,8 @@ static struct platform_driver arm_cspmu_driver = {
 static void arm_cspmu_set_active_cpu(int cpu, struct arm_cspmu *cspmu)
 {
        cpumask_set_cpu(cpu, &cspmu->active_cpu);
-       WARN_ON(irq_set_affinity(cspmu->irq, &cspmu->active_cpu));
+       if (cspmu->irq)
+               WARN_ON(irq_set_affinity(cspmu->irq, &cspmu->active_cpu));
 }
 
 static int arm_cspmu_cpu_online(unsigned int cpu, struct hlist_node *node)