s390/pai_crypto: Introduce PAI crypto specific event delete function

Introduce PAI crypto specific event delete function to handle
additional actions to be done at event removal.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Reviewed-by: Jan Polensky <japo@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

Author: Thomas Richter

arch/s390/kernel/perf_pai_crypto.c

@@ -138,7 +138,6 @@ static void pai_event_destroy(struct perf_event *event)
 {
 	int cpu;
 
-	static_branch_dec(&pai_key);
 	free_page(PAI_SAVE_AREA(event));
 	if (event->cpu == -1) {
 		struct cpumask *mask = PAI_CPU_MASK(event);
@@ -151,6 +150,12 @@ static void pai_event_destroy(struct perf_event *event)
 	}
 }
 
+static void paicrypt_event_destroy(struct perf_event *event)
+{
+	static_branch_dec(&pai_key);
+	pai_event_destroy(event);
+}
+
 static u64 pai_getctr(unsigned long *page, int nr, unsigned long offset)
 {
 	if (offset)
@@ -360,7 +365,7 @@ static int paicrypt_event_init(struct perf_event *event)
 	int rc = pai_event_init(event, PAI_PMU_CRYPTO);
 
 	if (!rc) {
-		event->destroy = pai_event_destroy;
+		event->destroy = paicrypt_event_destroy;
 		static_branch_inc(&pai_key);
 	}
 	return rc;