V4L/DVB (6580): Set slave's master before master's attach call.

V4L: Int if: Set slave's master before attach, remove master argument

The master also now gets its own pointer from slave's structure.

Signed-off-by: Sakari Ailus <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/video/v4l2-int-device.c

···
 			if (!try_module_get(m->module))
 				continue;
 
-			if (m->u.master->attach(m, s)) {
+			s->u.slave->master = m;
+			if (m->u.master->attach(s)) {
+				s->u.slave->master = NULL;
 				module_put(m->module);
 				continue;
 			}
-
-			s->u.slave->master = m;
 		}
 	}
 }

include/media/v4l2-int-device.h

···
 struct v4l2_int_device;
 
 struct v4l2_int_master {
-	int (*attach)(struct v4l2_int_device *master,
-		      struct v4l2_int_device *slave);
-	void (*detach)(struct v4l2_int_device *master);
+	int (*attach)(struct v4l2_int_device *slave);
+	void (*detach)(struct v4l2_int_device *slave);
 };
 
 typedef int (v4l2_int_ioctl_func)(struct v4l2_int_device *);