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drivers/perf: hisi_pcie: Check the type first in pmu::event_init()
[ Upstream commit 6d7d51e88e21c0af1ca96a3617afef334bfeffcf ]
Check whether the event type matches the PMU type firstly in
pmu::event_init() before touching the event. Otherwise we'll
change the events of others and lead to incorrect results.
Since in perf_init_event() we may call every pmu's event_init()
in a certain case, we should not modify the event if it's not
ours.
Fixes: 8404b0fbc7
("drivers/perf: hisi: Add driver for HiSilicon PCIe PMU")
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Link: https://lore.kernel.org/r/20231024092954.42297-2-yangyicong@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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parent
31c99087d1
commit
5d6d45e2d5
1 changed files with 4 additions and 3 deletions
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@ -353,6 +353,10 @@ static int hisi_pcie_pmu_event_init(struct perf_event *event)
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struct hisi_pcie_pmu *pcie_pmu = to_pcie_pmu(event->pmu);
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struct hw_perf_event *hwc = &event->hw;
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/* Check the type first before going on, otherwise it's not our event */
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if (event->attr.type != event->pmu->type)
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return -ENOENT;
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event->cpu = pcie_pmu->on_cpu;
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if (EXT_COUNTER_IS_USED(hisi_pcie_get_event(event)))
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@ -360,9 +364,6 @@ static int hisi_pcie_pmu_event_init(struct perf_event *event)
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else
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hwc->event_base = HISI_PCIE_CNT;
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if (event->attr.type != event->pmu->type)
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return -ENOENT;
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/* Sampling is not supported. */
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if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
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return -EOPNOTSUPP;
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