X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=udev_device.c;h=87f90c76769b714320381368ab9cf02649c2030e;hb=f051e340699286831b90b242d843eb1a38c2b19f;hp=a7a8b13c96006826db200bda0b72bd2567d548ac;hpb=fa33d857e2cdd65d3de2f88021ecacf167fc21f0;p=elogind.git

diff --git a/udev_device.c b/udev_device.c
index a7a8b13c9..87f90c767 100644
--- a/udev_device.c
+++ b/udev_device.c
@@ -81,7 +81,7 @@ dev_t udev_device_get_devt(struct udevice *udev)
 	return makedev(0, 0);
 }
 
-static int rename_net_if(struct udevice *udev)
+static int rename_netif(struct udevice *udev)
 {
 	int sk;
 	struct ifreq ifr;
@@ -100,12 +100,45 @@ static int rename_net_if(struct udevice *udev)
 	memset(&ifr, 0x00, sizeof(struct ifreq));
 	strlcpy(ifr.ifr_name, udev->dev->kernel_name, IFNAMSIZ);
 	strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
-
 	retval = ioctl(sk, SIOCSIFNAME, &ifr);
-	if (retval != 0)
-		err("error changing net interface name: %s", strerror(errno));
-	close(sk);
+	if (retval != 0) {
+		int loop;
+
+		/* see if the destination interface name already exists */
+		if (errno != EEXIST) {
+			err("error changing netif name %s to %s: %s", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+			goto exit;
+		}
+
+		/* free our own name, another process may wait for us */
+		strlcpy(ifr.ifr_newname, udev->dev->kernel_name, IFNAMSIZ);
+		strlcat(ifr.ifr_newname, "_rename", IFNAMSIZ);
+		retval = ioctl(sk, SIOCSIFNAME, &ifr);
+		if (retval != 0) {
+			err("error changing netif name %s to %s: %s", ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+			goto exit;
+		}
 
+		/* wait 30 seconds for our target to become available */
+		strlcpy(ifr.ifr_name, ifr.ifr_newname, IFNAMSIZ);
+		strlcpy(ifr.ifr_newname, udev->name, IFNAMSIZ);
+		loop = 30 * 20;
+		while (loop--) {
+			retval = ioctl(sk, SIOCSIFNAME, &ifr);	
+			if (retval != 0) {
+				if (errno != EEXIST) {
+					err("error changing net interface name %s to %s: %s",
+					    ifr.ifr_name, ifr.ifr_newname, strerror(errno));
+					break;
+				}
+				dbg("wait for netif '%s' to become free, loop=%i", udev->name, (30 * 20) - loop);
+				usleep(1000 * 1000 / 20);
+			}
+		}
+	}
+
+exit:
+	close(sk);
 	return retval;
 }
 
@@ -114,7 +147,8 @@ int udev_device_event(struct udev_rules *rules, struct udevice *udev)
 	int retval = 0;
 
 	/* add device node */
-	if (major(udev->devt) != 0 && strcmp(udev->action, "add") == 0) {
+	if (major(udev->devt) != 0 &&
+	    (strcmp(udev->action, "add") == 0 || strcmp(udev->action, "change") == 0)) {
 		struct udevice *udev_old;
 
 		dbg("device node add '%s'", udev->dev->devpath);
@@ -180,7 +214,7 @@ int udev_device_event(struct udev_rules *rules, struct udevice *udev)
 		if (strcmp(udev->name, udev->dev->kernel_name) != 0) {
 			char *pos;
 
-			retval = rename_net_if(udev);
+			retval = rename_netif(udev);
 			if (retval != 0)
 				goto exit;
 			info("renamed netif to '%s'", udev->name);