[PATCH 2/3] do_epoll_ctl(): clean the failure exits up a bit

[Tim Gardner]

From: Al Viro <viro at zeniv.linux.org.uk>

Signed-off-by: Al Viro <viro at zeniv.linux.org.uk>
(cherry picked from commit 52c479697c9b73f628140dcdfcd39ea302d05482)
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
---
 fs/eventpoll.c | 19 ++++++-------------
 1 file changed, 6 insertions(+), 13 deletions(-)

diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index abf217835907..e28e3030f8d8 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -2181,29 +2181,22 @@ int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds,
 			full_check = 1;
 			if (is_file_epoll(tf.file)) {
 				error = -ELOOP;
-				if (ep_loop_check(ep, tf.file) != 0) {
-					clear_tfile_check_list();
+				if (ep_loop_check(ep, tf.file) != 0)
 					goto error_tgt_fput;
-				}
 			} else {
 				get_file(tf.file);
 				list_add(&tf.file->f_tfile_llink,
 							&tfile_check_list);
 			}
 			error = epoll_mutex_lock(&ep->mtx, 0, nonblock);
-			if (error) {
-out_del:
-				list_del(&tf.file->f_tfile_llink);
-				if (!is_file_epoll(tf.file))
-					fput(tf.file);
+			if (error)
 				goto error_tgt_fput;
-			}
 			if (is_file_epoll(tf.file)) {
 				tep = tf.file->private_data;
 				error = epoll_mutex_lock(&tep->mtx, 1, nonblock);
 				if (error) {
 					mutex_unlock(&ep->mtx);
-					goto out_del;
+					goto error_tgt_fput;
 				}
 			}
 		}
@@ -2224,8 +2217,6 @@ int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds,
 			error = ep_insert(ep, epds, tf.file, fd, full_check);
 		} else
 			error = -EEXIST;
-		if (full_check)
-			clear_tfile_check_list();
 		break;
 	case EPOLL_CTL_DEL:
 		if (epi)
@@ -2248,8 +2239,10 @@ int do_epoll_ctl(int epfd, int op, int fd, struct epoll_event *epds,
 	mutex_unlock(&ep->mtx);
 
 error_tgt_fput:
-	if (full_check)
+	if (full_check) {
+		clear_tfile_check_list();
 		mutex_unlock(&epmutex);
+	}
 
 	fdput(tf);
 error_fput:
-- 
2.17.1