[PATCH 5/8] pipe: simplify logic in alloc_pipe_info()

[Michael Kerrisk (man-pages)]

Replace an 'if' block that covers most of the code in this
function with a 'goto'. This makes the code a little simpler
to read, and also simplifies the next patch.

Cc: Willy Tarreau <w...@1wt.eu>
Cc: Vegard Nossum <vegard.nos...@oracle.com>
Cc: socketp...@gmail.com
Cc: Tetsuo Handa <penguin-ker...@i-love.sakura.ne.jp>
Cc: Jens Axboe <ax...@fb.com>
Cc: Al Viro <v...@zeniv.linux.org.uk>
Cc: linux-...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Michael Kerrisk <mtk.manpa...@gmail.com>

---
 fs/pipe.c | 45 +++++++++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 22 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index a7470a9..613c6b9 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -625,33 +625,34 @@ static bool too_many_pipe_buffers_hard(struct user_struct 
*user)
 struct pipe_inode_info *alloc_pipe_info(void)
 {
        struct pipe_inode_info *pipe;
+       unsigned long pipe_bufs = PIPE_DEF_BUFFERS;
+       struct user_struct *user = get_current_user();
 
        pipe = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL_ACCOUNT);
-       if (pipe) {
-               unsigned long pipe_bufs = PIPE_DEF_BUFFERS;
-               struct user_struct *user = get_current_user();
-
-               if (!too_many_pipe_buffers_hard(user)) {
-                       if (too_many_pipe_buffers_soft(user))
-                               pipe_bufs = 1;
-                       pipe->bufs = kcalloc(pipe_bufs,
-                                            sizeof(struct pipe_buffer),
-                                            GFP_KERNEL_ACCOUNT);
-               }
+       if (pipe == NULL)
+               goto out_free_uid;
+
+       if (!too_many_pipe_buffers_hard(user)) {
+               if (too_many_pipe_buffers_soft(user))
+                       pipe_bufs = 1;
+               pipe->bufs = kcalloc(pipe_bufs,
+                                    sizeof(struct pipe_buffer),
+                                    GFP_KERNEL_ACCOUNT);
+       }
 
-               if (pipe->bufs) {
-                       init_waitqueue_head(&pipe->wait);
-                       pipe->r_counter = pipe->w_counter = 1;
-                       pipe->buffers = pipe_bufs;
-                       pipe->user = user;
-                       account_pipe_buffers(user, 0, pipe_bufs);
-                       mutex_init(&pipe->mutex);
-                       return pipe;
-               }
-               free_uid(user);
-               kfree(pipe);
+       if (pipe->bufs) {
+               init_waitqueue_head(&pipe->wait);
+               pipe->r_counter = pipe->w_counter = 1;
+               pipe->buffers = pipe_bufs;
+               pipe->user = user;
+               account_pipe_buffers(user, 0, pipe_bufs);
+               mutex_init(&pipe->mutex);
+               return pipe;
        }
 
+       kfree(pipe);
+out_free_uid:
+       free_uid(user);
        return NULL;
 }
 
-- 
2.5.5