1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 3787102e4b12..f45cd74e6f24 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -57,6 +57,9 @@ struct tty_buffer {
         unsigned char *flag_buf_ptr;
         int used;
         int size;
+        int active;
+        int commit;
+        int read;
         /* Data points here */
         unsigned long data[0];
 };
@@ -64,6 +67,7 @@ struct tty_buffer {
 struct tty_bufhead {
         struct work_struct              work;
         struct semaphore pty_sem;
+        spinlock_t lock;
         struct tty_buffer *head;        /* Queue head */
         struct tty_buffer *tail;        /* Active buffer */
         struct tty_buffer *free;        /* Free queue head */