[PATCH 09/14] drivers/firmware/sdei: Introduce sdei_do_local_call()

[Gavin Shan]

For the private events, there are codes to repeat the same steps:
initializing cross call argument, make function call on local CPU,
check the returned error.

This introduces sdei_do_local_call() helper to cover the first two
steps. Another benefit is to make CROSSCALL_INIT and sdei_crosscall_args
only visible to sddi_do_{cross, local}_call().

Signed-off-by: Gavin Shan <gshan at redhat.com>
---
 drivers/firmware/arm_sdei.c | 42 +++++++++++++++++++++++--------------
 1 file changed, 26 insertions(+), 16 deletions(-)

diff --git a/drivers/firmware/arm_sdei.c b/drivers/firmware/arm_sdei.c
index 3393f1650b20..6a583eb34222 100644
--- a/drivers/firmware/arm_sdei.c
+++ b/drivers/firmware/arm_sdei.c
@@ -102,6 +102,18 @@ static inline int sdei_do_cross_call(void *fn, struct sdei_event * event)
 	return arg.first_error;
 }
 
+static inline int sdei_do_local_call(void *fn,
+				     struct sdei_event *event)
+{
+	struct sdei_crosscall_args arg;
+	void (*func)(void *) = fn;
+
+	CROSSCALL_INIT(arg, event);
+	func(&arg);
+
+	return arg.first_error;
+}
+
 static int sdei_to_linux_errno(unsigned long sdei_err)
 {
 	switch (sdei_err) {
@@ -675,7 +687,7 @@ static int sdei_reregister_shared(void)
 static int sdei_cpuhp_down(unsigned int cpu)
 {
 	struct sdei_event *event;
-	struct sdei_crosscall_args arg;
+	int err;
 
 	/* un-register private events */
 	spin_lock(&sdei_list_lock);
@@ -683,12 +695,11 @@ static int sdei_cpuhp_down(unsigned int cpu)
 		if (event->type == SDEI_EVENT_TYPE_SHARED)
 			continue;
 
-		CROSSCALL_INIT(arg, event);
-		/* call the cross-call function locally... */
-		_local_event_unregister(&arg);
-		if (arg.first_error)
+		err = sdei_do_local_call(_local_event_unregister, event);
+		if (err) {
 			pr_err("Failed to unregister event %u: %d\n",
-			       event->event_num, arg.first_error);
+			       event->event_num, err);
+		}
 	}
 	spin_unlock(&sdei_list_lock);
 
@@ -698,7 +709,7 @@ static int sdei_cpuhp_down(unsigned int cpu)
 static int sdei_cpuhp_up(unsigned int cpu)
 {
 	struct sdei_event *event;
-	struct sdei_crosscall_args arg;
+	int err;
 
 	/* re-register/enable private events */
 	spin_lock(&sdei_list_lock);
@@ -707,20 +718,19 @@ static int sdei_cpuhp_up(unsigned int cpu)
 			continue;
 
 		if (event->reregister) {
-			CROSSCALL_INIT(arg, event);
-			/* call the cross-call function locally... */
-			_local_event_register(&arg);
-			if (arg.first_error)
+			err = sdei_do_local_call(_local_event_register, event);
+			if (err) {
 				pr_err("Failed to re-register event %u: %d\n",
-				       event->event_num, arg.first_error);
+				       event->event_num, err);
+			}
 		}
 
 		if (event->reenable) {
-			CROSSCALL_INIT(arg, event);
-			_local_event_enable(&arg);
-			if (arg.first_error)
+			err = sdei_do_local_call(_local_event_enable, event);
+			if (err) {
 				pr_err("Failed to re-enable event %u: %d\n",
-				       event->event_num, arg.first_error);
+				       event->event_num, err);
+			}
 		}
 	}
 	spin_unlock(&sdei_list_lock);
-- 
2.23.0