linux-kernel - [PATCH 08/10] ipconfig: use dev_set

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Message-Id: <20180118193755.19997-8-viro@ZenIV.linux.org.uk>
Date:   Thu, 18 Jan 2018 19:37:53 +0000
From:   Al Viro <viro@...IV.linux.org.uk>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 08/10] ipconfig: use dev_set_mtu()

From: Al Viro <viro@...iv.linux.org.uk>

Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 net/ipv4/ipconfig.c | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
index 5f396afaa08d..f75802ad960f 100644
--- a/net/ipv4/ipconfig.c
+++ b/net/ipv4/ipconfig.c
@@ -329,17 +329,6 @@ set_sockaddr(struct sockaddr_in *sin, __be32 addr, __be16 port)
 	sin->sin_port = port;
 }
 
-static int __init ic_dev_ioctl(unsigned int cmd, struct ifreq *arg)
-{
-	int res;
-
-	mm_segment_t oldfs = get_fs();
-	set_fs(get_ds());
-	res = dev_ioctl(&init_net, cmd, (struct ifreq __user *) arg);
-	set_fs(oldfs);
-	return res;
-}
-
 /*
  *	Set up interface addresses and routes.
  */
@@ -375,11 +364,11 @@ static int __init ic_setup_if(void)
 	 * out, we'll try to muddle along.
 	 */
 	if (ic_dev_mtu != 0) {
-		strcpy(ir.ifr_name, ic_dev->dev->name);
-		ir.ifr_mtu = ic_dev_mtu;
-		if ((err = ic_dev_ioctl(SIOCSIFMTU, &ir)) < 0)
+		rtnl_lock();
+		if ((err = dev_set_mtu(ic_dev->dev, ic_dev_mtu)) < 0)
 			pr_err("IP-Config: Unable to set interface mtu to %d (%d)\n",
 			       ic_dev_mtu, err);
+		rtnl_unlock();
 	}
 	return 0;
 }
-- 
2.11.0