From: Yicong Yang <yangyicong@hisilicon.com>
Date: Tue, 10 Oct 2023 08:47:30 +0000 (+0800)
Subject: hwtracing: hisi_ptt: Don't try to attach a task
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=aff787f64ad7cbb54614b51b82c682fe06411ef3;p=linux.git

hwtracing: hisi_ptt: Don't try to attach a task

PTT is an uncore PMU and shouldn't be attached to any task. Block
the usage in pmu::event_init().

Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20231010084731.30450-5-yangyicong@huawei.com
---

diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
index dbed4fd4e296c..a991ecb7515a3 100644
--- a/drivers/hwtracing/ptt/hisi_ptt.c
+++ b/drivers/hwtracing/ptt/hisi_ptt.c
@@ -1000,6 +1000,9 @@ static int hisi_ptt_pmu_event_init(struct perf_event *event)
 		return -EOPNOTSUPP;
 	}
 
+	if (event->attach_state & PERF_ATTACH_TASK)
+		return -EOPNOTSUPP;
+
 	if (event->attr.type != hisi_ptt->hisi_ptt_pmu.type)
 		return -ENOENT;