Re: [PATCH v2 5/8] pipe: simplify logic in alloc_pipe_info()

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 (fix limit checking in alloc_pipe_info())

Cc: Willy Tarreau <w@1wt.eu>
Cc: Vegard Nossum <redacted>
Cc: socketpair-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
Cc: Tetsuo Handa <penguin-kernel-JPay3/Yim36HaxMnTkn67Xf5DAMn2ifp@public.gmane.org>
Cc: Jens Axboe <redacted>
Cc: Al Viro <viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org>
Cc: linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Michael Kerrisk <redacted>
---
 fs/pipe.c | 45 +++++++++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 22 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index f45a173..256fc5a 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;