From 97595710b77aa162ca5e20da57d0a1ed7355eaad Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay@vrfy.org>
Date: Thu, 5 Jul 2012 17:40:50 +0200
Subject: udev: network device renaming - immediately give up if the target
 name isn't available

---
 src/udev/udev-event.c | 69 +++++++--------------------------------------------
 1 file changed, 9 insertions(+), 60 deletions(-)

(limited to 'src')

diff --git a/src/udev/udev-event.c b/src/udev/udev-event.c
index aff14878a7..46e579dce2 100644
--- a/src/udev/udev-event.c
+++ b/src/udev/udev-event.c
@@ -745,32 +745,11 @@ out:
         return err;
 }
 
-static void rename_netif_kernel_log(struct ifreq ifr)
-{
-        int klog;
-        FILE *f;
-
-        klog = open("/dev/kmsg", O_WRONLY|O_CLOEXEC);
-        if (klog < 0)
-                return;
-
-        f = fdopen(klog, "w");
-        if (f == NULL) {
-                close(klog);
-                return;
-        }
-
-        fprintf(f, "<30>udevd[%u]: renamed network interface %s to %s\n",
-                getpid(), ifr.ifr_name, ifr.ifr_newname);
-        fclose(f);
-}
-
 static int rename_netif(struct udev_event *event)
 {
         struct udev_device *dev = event->dev;
         int sk;
         struct ifreq ifr;
-        int loop;
         int err;
 
         log_debug("changing net interface name from '%s' to '%s'\n",
@@ -787,49 +766,19 @@ static int rename_netif(struct udev_event *event)
         util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
         util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
         err = ioctl(sk, SIOCSIFNAME, &ifr);
-        if (err == 0) {
-                rename_netif_kernel_log(ifr);
-                goto out;
-        }
-
-        /* keep trying if the destination interface name already exists */
-        err = -errno;
-        if (err != -EEXIST)
-                goto out;
-
-        /* free our own name, another process may wait for us */
-        snprintf(ifr.ifr_newname, IFNAMSIZ, "rename%u", udev_device_get_ifindex(dev));
-        err = ioctl(sk, SIOCSIFNAME, &ifr);
-        if (err < 0) {
-                err = -errno;
-                goto out;
-        }
-
-        /* log temporary name */
-        rename_netif_kernel_log(ifr);
-
-        /* wait a maximum of 90 seconds for our target to become available */
-        util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
-        util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
-        loop = 90 * 20;
-        while (loop--) {
-                const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
-
-                nanosleep(&duration, NULL);
+        if (err >= 0) {
+                FILE *f;
 
-                err = ioctl(sk, SIOCSIFNAME, &ifr);
-                if (err == 0) {
-                        rename_netif_kernel_log(ifr);
-                        break;
+                f = fopen("/dev/kmsg", "we");
+                if (f != NULL) {
+                        fprintf(f, "<30>systemd-udevd[%u]: renamed network interface %s to %s\n",
+                                getpid(), ifr.ifr_name, ifr.ifr_newname);
+                        fclose(f);
                 }
+        } else {
                 err = -errno;
-                if (err != -EEXIST)
-                        break;
-        }
-
-out:
-        if (err < 0)
                 log_error("error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
+        }
         close(sk);
         return err;
 }
-- 
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