From: Yicong Yang Date: Tue, 24 Oct 2023 09:29:53 +0000 (+0800) Subject: drivers/perf: hisi_pcie: Check the type first in pmu::event_init() X-Git-Tag: v6.1.63~231 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=104fa6426a8fe9c38113bb58fd1cd526bf4d39d6;p=sdk%2Femulator%2Femulator-kernel.git 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: 8404b0fbc7fb ("drivers/perf: hisi: Add driver for HiSilicon PCIe PMU") Signed-off-by: Yicong Yang Link: https://lore.kernel.org/r/20231024092954.42297-2-yangyicong@huawei.com Signed-off-by: Will Deacon Signed-off-by: Sasha Levin --- diff --git a/drivers/perf/hisilicon/hisi_pcie_pmu.c b/drivers/perf/hisilicon/hisi_pcie_pmu.c index b61f1f9aba21..c4c1cd269c57 100644 --- a/drivers/perf/hisilicon/hisi_pcie_pmu.c +++ b/drivers/perf/hisilicon/hisi_pcie_pmu.c @@ -342,6 +342,10 @@ 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))) @@ -349,9 +353,6 @@ 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;