tty: Add a kref count

[linux-2.6-omap-h63xx.git] / kernel / fork.c

diff --git a/kernel/fork.c b/kernel/fork.c
index 7ce2ebe847964ecd0701c3c74c18994e3eebcf26..30de644a40c4d4d9617d650589f4c90da1e977a2 100644 (file)
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -802,6 +802,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 
        sig->leader = 0;        /* session leadership doesn't inherit */
        sig->tty_old_pgrp = NULL;
+       sig->tty = NULL;
 
        sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero;
        sig->gtime = cputime_zero;
@@ -838,6 +839,7 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk)
 void __cleanup_signal(struct signal_struct *sig)
 {
        exit_thread_group_keys(sig);
+       tty_kref_put(sig->tty);
        kmem_cache_free(signal_cachep, sig);
 }
 
@@ -1227,7 +1229,8 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                                p->nsproxy->pid_ns->child_reaper = p;
 
                        p->signal->leader_pid = pid;
-                       p->signal->tty = current->signal->tty;
+                       tty_kref_put(p->signal->tty);
+                       p->signal->tty = tty_kref_get(current->signal->tty);
                        set_task_pgrp(p, task_pgrp_nr(current));
                        set_task_session(p, task_session_nr(current));
                        attach_pid(p, PIDTYPE_PGID, task_pgrp(current));