ARM64: rockchip: cpufreq-dt: enable CPUFREQ_HAVE_GOVERNOR_PER_POLICY

[firefly-linux-kernel-4.4.55.git] / fs / devpts / inode.c

diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index c35ffdc12bbafd1874dcea43ec5094867daf3e0d..706de324f2a619b8a15f0d7bf82263fb3a45dee2 100644 (file)
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -575,6 +575,26 @@ void devpts_kill_index(struct inode *ptmx_inode, int idx)
        mutex_unlock(&allocated_ptys_lock);
 }
 
+/*
+ * pty code needs to hold extra references in case of last /dev/tty close
+ */
+
+void devpts_add_ref(struct inode *ptmx_inode)
+{
+       struct super_block *sb = pts_sb_from_inode(ptmx_inode);
+
+       atomic_inc(&sb->s_active);
+       ihold(ptmx_inode);
+}
+
+void devpts_del_ref(struct inode *ptmx_inode)
+{
+       struct super_block *sb = pts_sb_from_inode(ptmx_inode);
+
+       iput(ptmx_inode);
+       deactivate_super(sb);
+}
+
 /**
  * devpts_pty_new -- create a new inode in /dev/pts/
  * @ptmx_inode: inode of the master