linux-kernel - [PATCH v3 31/57] perf: Simplify perf_event_modify

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Message-ID: <20230612093539.753013700@infradead.org>
Date:   Mon, 12 Jun 2023 11:07:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     torvalds@...ux-foundation.org, keescook@...omium.org,
        gregkh@...uxfoundation.org, pbonzini@...hat.com
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Subject: [PATCH v3 31/57] perf: Simplify perf_event_modify_attr()


Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/events/core.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3172,7 +3172,7 @@ static int perf_event_modify_attr(struct
 
 	WARN_ON_ONCE(event->ctx->parent_ctx);
 
-	mutex_lock(&event->child_mutex);
+	guard(mutex)(&event->child_mutex);
 	/*
 	 * Event-type-independent attributes must be copied before event-type
 	 * modification, which will validate that final attributes match the
@@ -3181,16 +3181,16 @@ static int perf_event_modify_attr(struct
 	perf_event_modify_copy_attr(&event->attr, attr);
 	err = func(event, attr);
 	if (err)
-		goto out;
+		return err;
+
 	list_for_each_entry(child, &event->child_list, child_list) {
 		perf_event_modify_copy_attr(&child->attr, attr);
 		err = func(child, attr);
 		if (err)
-			goto out;
+			return err;
 	}
-out:
-	mutex_unlock(&event->child_mutex);
-	return err;
+
+	return 0;
 }
 
 static void __pmu_ctx_sched_out(struct perf_event_pmu_context *pmu_ctx,