netdev - [PATCH net-next] tun: return proper error code from tun_do

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Message-ID: <1419578569-13132-1-git-send-email-agartrell@fb.com>
Date:	Thu, 25 Dec 2014 23:22:49 -0800
From:	Alex Gartrell <agartrell@...com>
To:	<davem@...emloft.net>, <herbert@...dor.apana.org.au>
CC:	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<kernel-team@...com>, Alex Gartrell <agartrell@...com>
Subject: [PATCH net-next] tun: return proper error code from tun_do_read

Instead of -1 with EAGAIN, read on a O_NONBLOCK tun fd will return 0.  This
fixes this by properly returning the error code from __skb_recv_datagram.

Signed-off-by: Alex Gartrell <agartrell@...com>
---
 drivers/net/tun.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index a5cbf67..2f65d6c 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1378,7 +1378,7 @@ static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile,
 	skb = __skb_recv_datagram(tfile->socket.sk, noblock ? MSG_DONTWAIT : 0,
 				  &peeked, &off, &err);
 	if (!skb)
-		return 0;
+		return err;
 
 	ret = tun_put_user(tun, tfile, skb, to);
 	if (unlikely(ret < 0))
-- 
Alex Gartrell <agartrell@...com>

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