Change liveupdate_unregister_file_handler and liveupdate_unregister_flb
to return void instead of an error code. This follows the design
principle that unregistration during module unload should not fail,
as the unload cannot be stopped at that point.

Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
---
 include/linux/liveupdate.h   | 14 ++++++--------
 kernel/liveupdate/luo_file.c |  6 ++----
 kernel/liveupdate/luo_flb.c  |  8 +++-----
 3 files changed, 11 insertions(+), 17 deletions(-)

diff --git a/include/linux/liveupdate.h b/include/linux/liveupdate.h
index 8394fb2d8774..636175432d62 100644
--- a/include/linux/liveupdate.h
+++ b/include/linux/liveupdate.h
@@ -231,12 +231,12 @@ bool liveupdate_enabled(void);
 int liveupdate_reboot(void);
 
 int liveupdate_register_file_handler(struct liveupdate_file_handler *fh);
-int liveupdate_unregister_file_handler(struct liveupdate_file_handler *fh);
+void liveupdate_unregister_file_handler(struct liveupdate_file_handler *fh);
 
 int liveupdate_register_flb(struct liveupdate_file_handler *fh,
 			    struct liveupdate_flb *flb);
-int liveupdate_unregister_flb(struct liveupdate_file_handler *fh,
-			      struct liveupdate_flb *flb);
+void liveupdate_unregister_flb(struct liveupdate_file_handler *fh,
+			       struct liveupdate_flb *flb);
 
 int liveupdate_flb_get_incoming(struct liveupdate_flb *flb, void **objp);
 int liveupdate_flb_get_outgoing(struct liveupdate_flb *flb, void **objp);
@@ -258,9 +258,8 @@ static inline int liveupdate_register_file_handler(struct liveupdate_file_handle
 	return -EOPNOTSUPP;
 }
 
-static inline int liveupdate_unregister_file_handler(struct liveupdate_file_handler *fh)
+static inline void liveupdate_unregister_file_handler(struct liveupdate_file_handler *fh)
 {
-	return -EOPNOTSUPP;
 }
 
 static inline int liveupdate_register_flb(struct liveupdate_file_handler *fh,
@@ -269,10 +268,9 @@ static inline int liveupdate_register_flb(struct liveupdate_file_handler *fh,
 	return -EOPNOTSUPP;
 }
 
-static inline int liveupdate_unregister_flb(struct liveupdate_file_handler *fh,
-					    struct liveupdate_flb *flb)
+static inline void liveupdate_unregister_flb(struct liveupdate_file_handler *fh,
+					     struct liveupdate_flb *flb)
 {
-	return -EOPNOTSUPP;
 }
 
 static inline int liveupdate_flb_get_incoming(struct liveupdate_flb *flb,
diff --git a/kernel/liveupdate/luo_file.c b/kernel/liveupdate/luo_file.c
index c9c26015020b..a38ea4975824 100644
--- a/kernel/liveupdate/luo_file.c
+++ b/kernel/liveupdate/luo_file.c
@@ -874,15 +874,13 @@ int liveupdate_register_file_handler(struct liveupdate_file_handler *fh)
  * Unregisters the file handler from the liveupdate core. This function
  * reverses the operations of liveupdate_register_file_handler().
  */
-int liveupdate_unregister_file_handler(struct liveupdate_file_handler *fh)
+void liveupdate_unregister_file_handler(struct liveupdate_file_handler *fh)
 {
 	if (!liveupdate_enabled())
-		return -EOPNOTSUPP;
+		return;
 
 	scoped_guard(rwsem_write, &luo_file_handler_lock) {
 		luo_flb_unregister_all(fh);
 		list_del(&ACCESS_PRIVATE(fh, list));
 	}
-
-	return 0;
 }
diff --git a/kernel/liveupdate/luo_flb.c b/kernel/liveupdate/luo_flb.c
index 5b61c0844a49..874830f8e44d 100644
--- a/kernel/liveupdate/luo_flb.c
+++ b/kernel/liveupdate/luo_flb.c
@@ -476,18 +476,16 @@ int liveupdate_register_flb(struct liveupdate_file_handler *fh,
  * owner module (acquired during registration) is released.
  *
  */
-int liveupdate_unregister_flb(struct liveupdate_file_handler *fh,
-			      struct liveupdate_flb *flb)
+void liveupdate_unregister_flb(struct liveupdate_file_handler *fh,
+			       struct liveupdate_flb *flb)
 {
 	if (!liveupdate_enabled())
-		return -EOPNOTSUPP;
+		return;
 
 	guard(rwsem_write)(&luo_flb_lock);
 	guard(rwsem_write)(&ACCESS_PRIVATE(fh, flb_lock));
 
 	luo_flb_unregister_one(fh, flb);
-
-	return 0;
 }
 
 /**
-- 
2.53.0.851.ga537e3e6e9-goog