From e8dbad66ef56074eadb41ed5998acd2320447018 Mon Sep 17 00:00:00 2001 From: Jason Wang Date: Mon, 22 Apr 2013 20:40:39 +0000 Subject: [PATCH] tuntap: correct the return value in tun_set_iff() commit (3be8fbab tuntap: fix error return code in tun_set_iff()) breaks the creation of multiqueue tuntap since it forbids to create more than one queues for a multiqueue tuntap device. We need return 0 instead -EBUSY here since we don't want to re-initialize the device when one or more queues has been already attached. Add a comment and correct the return value to zero. Reported-by: Jerry Chu Cc: Jerry Chu Cc: Wei Yongjun Cc: Eric Dumazet Signed-off-by: Jason Wang Acked-by: Jerry Chu Acked-by: Michael S. Tsirkin Signed-off-by: David S. Miller --- drivers/net/tun.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index 729ed533bb3..0c9df2fe8f0 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1593,8 +1593,12 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr) return err; if (tun->flags & TUN_TAP_MQ && - (tun->numqueues + tun->numdisabled > 1)) - return -EBUSY; + (tun->numqueues + tun->numdisabled > 1)) { + /* One or more queue has already been attached, no need + * to initialize the device again. + */ + return 0; + } } else { char *name; -- 2.43.2