Patch "hwtracing: hisi_ptt: Move type check to the beginning of hisi_ptt_pmu_event_init()" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    hwtracing: hisi_ptt: Move type check to the beginning of hisi_ptt_pmu_event_init()

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     hwtracing-hisi_ptt-move-type-check-to-the-beginning-.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 2f1fefb3a71c87cfb236af25f16645346b5f786c
Author: Yang Jihong <yangjihong1@xxxxxxxxxx>
Date:   Mon Jan 8 12:19:06 2024 +0000

    hwtracing: hisi_ptt: Move type check to the beginning of hisi_ptt_pmu_event_init()
    
    [ Upstream commit 06226d120a28f146abd3637799958a4dc4dbb7a1 ]
    
    When perf_init_event() calls perf_try_init_event() to init pmu driver,
    searches for the next pmu driver only when the return value is -ENOENT.
    Therefore, hisi_ptt_pmu_event_init() needs to check the type at the
    beginning of the function.
    Otherwise, in the case of perf-task mode, perf_try_init_event() returns
    -EOPNOTSUPP and skips subsequent pmu drivers, causes perf_init_event() to
    fail.
    
    Fixes: ff0de066b463 ("hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe Tune and Trace device")
    Signed-off-by: Yang Jihong <yangjihong1@xxxxxxxxxx>
    Reviewed-by: Yicong Yang <yangyicong@xxxxxxxxxxxxx>
    Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
    Link: https://lore.kernel.org/r/20240108121906.3514820-1-yangjihong1@xxxxxxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
index a991ecb7515a3..24a1f7797aeb6 100644
--- a/drivers/hwtracing/ptt/hisi_ptt.c
+++ b/drivers/hwtracing/ptt/hisi_ptt.c
@@ -995,6 +995,9 @@ static int hisi_ptt_pmu_event_init(struct perf_event *event)
 	int ret;
 	u32 val;
 
+	if (event->attr.type != hisi_ptt->hisi_ptt_pmu.type)
+		return -ENOENT;
+
 	if (event->cpu < 0) {
 		dev_dbg(event->pmu->dev, "Per-task mode not supported\n");
 		return -EOPNOTSUPP;
@@ -1003,9 +1006,6 @@ static int hisi_ptt_pmu_event_init(struct perf_event *event)
 	if (event->attach_state & PERF_ATTACH_TASK)
 		return -EOPNOTSUPP;
 
-	if (event->attr.type != hisi_ptt->hisi_ptt_pmu.type)
-		return -ENOENT;
-
 	ret = hisi_ptt_trace_valid_filter(hisi_ptt, event->attr.config);
 	if (ret < 0)
 		return ret;




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