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drivers/perf: hisi_pcie: Check the type first in pmu::event_init()

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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>
This commit is contained in:
Yicong Yang 2023-10-24 17:29:53 +08:00 committed by Will Deacon
parent ab33c66fd8
commit 6d7d51e88e
1 changed files with 4 additions and 3 deletions
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7
drivers/perf/hisilicon/hisi_pcie_pmu.c
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@ -353,6 +353,10 @@ static int hisi_pcie_pmu_event_init(struct perf_event *event)
struct hisi_pcie_pmu *pcie_pmu = to_pcie_pmu(event->pmu);
struct hw_perf_event *hwc = &event->hw;
/* Check the type first before going on, otherwise it's not our event */
if (event->attr.type != event->pmu->type)
return -ENOENT;
event->cpu = pcie_pmu->on_cpu;
if (EXT_COUNTER_IS_USED(hisi_pcie_get_event(event)))
@ -360,9 +364,6 @@ static int hisi_pcie_pmu_event_init(struct perf_event *event)
else
hwc->event_base = HISI_PCIE_CNT;
if (event->attr.type != event->pmu->type)
return -ENOENT;
/* Sampling is not supported. */
if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
return -EOPNOTSUPP;