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perf: qcom_l2_pmu: fix an incorrect NULL check on list iterator

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The bug is here:
	return cluster;

The list iterator value 'cluster' will *always* be set and non-NULL
by list_for_each_entry(), so it is incorrect to assume that the
iterator value will be NULL if the list is empty or no element
is found.

To fix the bug, return 'cluster' when found, otherwise return NULL.

Cc: stable@vger.kernel.org
Fixes: 21bdbb7102 ("perf: add qcom l2 cache perf events driver")
Signed-off-by: Xiaomeng Tong <xiam0nd.tong@gmail.com>
Link: https://lore.kernel.org/r/20220327055733.4070-1-xiam0nd.tong@gmail.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Xiaomeng Tong 2022-03-27 13:57:33 +08:00 committed by Will Deacon
parent 4dfa1f3657
commit 2012a9e279
1 changed files with 3 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
drivers/perf/qcom_l2_pmu.c
View file

@ -736,7 +736,7 @@ static struct cluster_pmu *l2_cache_associate_cpu_with_cluster(
{
u64 mpidr;
int cpu_cluster_id;
struct cluster_pmu *cluster = NULL;
struct cluster_pmu *cluster;
/*
* This assumes that the cluster_id is in MPIDR[aff1] for
@ -758,10 +758,10 @@ static struct cluster_pmu *l2_cache_associate_cpu_with_cluster(
cluster->cluster_id);
cpumask_set_cpu(cpu, &cluster->cluster_cpus);
*per_cpu_ptr(l2cache_pmu->pmu_cluster, cpu) = cluster;
break;
return cluster;
}
return cluster;
return NULL;
}
static int l2cache_pmu_online_cpu(unsigned int cpu, struct hlist_node *node)