UML - tty locking

Jeff this is the tty locking diff I mentioned at Linux Kongress, it just ensures current->signal->tty doesn't get freed during log_exec().

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.18-rc6-mm1/arch/um/kernel/exec.c linux-2.6.18-rc6-mm1/arch/um/kernel/exec.c
@@ -41,9 +41,11 @@
         long error;
 
 #ifdef CONFIG_TTY_LOG
-	task_lock(current);
+	mutex_lock(&tty_mutex);
+	task_lock(current);	/* FIXME:  is this needed ? */
 	log_exec(argv, current->signal->tty);
 	task_unlock(current);
+	mutex_unlock(&tty_mutex);
 #endif
         error = do_execve(file, argv, env, &current->thread.regs);
         if (error == 0){

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