mISDN: Added an ioctl to change the device name

To get persistent device names with hotplug we need to rename devices
sometime.
Signed-off-by: Matthias Urlichs <matthias@urlichs.de>
Signed-off-by: Karsten Keil <kkeil@suse.de>

drivers/isdn/mISDN/socket.c

@@ -645,6 +645,21 @@ base_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 		} else
 			err = -ENODEV;
 		break;
+	case IMSETDEVNAME:
+		{
+			struct mISDN_devrename dn;
+			if (copy_from_user(&dn, (void __user *)arg,
+			    sizeof(dn))) {
+				err = -EFAULT;
+				break;
+			}
+			dev = get_mdevice(dn.id);
+			if (dev)
+				strlcpy(dev->name, dn.name, MISDN_MAX_IDLEN);
+			else
+				err = -ENODEV;
+		}
+		break;
 	default:
 		err = -EINVAL;
 	}

include/linux/mISDNif.h

@@ -36,8 +36,8 @@
  *              - should be incremented on every checkin
  */
 #define	MISDN_MAJOR_VERSION	1
-#define	MISDN_MINOR_VERSION	0
-#define MISDN_RELEASE		19
+#define	MISDN_MINOR_VERSION	1
+#define MISDN_RELEASE		20
 
 /* primitives for information exchange
  * generell format
@@ -255,16 +255,6 @@ struct sockaddr_mISDN {
 	unsigned char	tei;
 };
 
-/* timer device ioctl */
-#define IMADDTIMER	_IOR('I', 64, int)
-#define IMDELTIMER	_IOR('I', 65, int)
-/* socket ioctls */
-#define	IMGETVERSION	_IOR('I', 66, int)
-#define	IMGETCOUNT	_IOR('I', 67, int)
-#define IMGETDEVINFO	_IOR('I', 68, int)
-#define IMCTRLREQ	_IOR('I', 69, int)
-#define IMCLEAR_L2	_IOR('I', 70, int)
-
 struct mISDNversion {
 	unsigned char	major;
 	unsigned char	minor;
@@ -281,6 +271,23 @@ struct mISDN_devinfo {
 	char			name[MISDN_MAX_IDLEN];
 };
 
+struct mISDN_devrename {
+	u_int			id;
+	char			name[MISDN_MAX_IDLEN]; /* new name */
+};
+
+/* timer device ioctl */
+#define IMADDTIMER	_IOR('I', 64, int)
+#define IMDELTIMER	_IOR('I', 65, int)
+
+/* socket ioctls */
+#define	IMGETVERSION	_IOR('I', 66, int)
+#define	IMGETCOUNT	_IOR('I', 67, int)
+#define IMGETDEVINFO	_IOR('I', 68, int)
+#define IMCTRLREQ	_IOR('I', 69, int)
+#define IMCLEAR_L2	_IOR('I', 70, int)
+#define IMSETDEVNAME	_IOR('I', 71, struct mISDN_devrename)
+
 static inline int
 test_channelmap(u_int nr, u_char *map)
 {