netdev - [PATCH] socket: do a generic_file_splice_read when proto_ops has no splice

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Date:   Fri, 16 Nov 2018 11:27:53 +0200
From:   kaslevs@...are.com
To:     netdev@...r.kernel.org
Cc:     davem@...emloft.net
Subject: [PATCH] socket: do a generic_file_splice_read when proto_ops has no splice_read

From: Slavomir Kaslev <kaslevs@...are.com>

splice(2) fails with -EINVAL when called reading on a socket with no splice_read
set in its proto_ops (such as vsock sockets). Switch this to fallbacks to a
generic_file_splice_read instead.

Signed-off-by: Slavomir Kaslev <kaslevs@...are.com>
---
 net/socket.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/socket.c b/net/socket.c
index 593826e11a53..334fcc617ef2 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -853,7 +853,7 @@ static ssize_t sock_splice_read(struct file *file, loff_t *ppos,
 	struct socket *sock = file->private_data;
 
 	if (unlikely(!sock->ops->splice_read))
-		return -EINVAL;
+		return generic_file_splice_read(file, ppos, pipe, len, flags);
 
 	return sock->ops->splice_read(sock, ppos, pipe, len, flags);
 }
-- 
2.19.1