1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 841f0bd3eaaf..f07637a8f88f 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -2723,7 +2723,11 @@ static void __do_SAK(void *arg)
                 }
                 task_lock(p);
                 if (p->files) {
-                        rcu_read_lock();
+                        /*
+                         * We don't take a ref to the file, so we must
+                         * hold ->file_lock instead.
+                         */
+                        spin_lock(&p->files->file_lock);
                         fdt = files_fdtable(p->files);
                         for (i=0; i < fdt->max_fds; i++) {
                                 filp = fcheck_files(p->files, i);
@@ -2738,7 +2742,7 @@ static void __do_SAK(void *arg)
                                         break;
                                 }
                         }
-                        rcu_read_unlock();
+                        spin_unlock(&p->files->file_lock);
                 }
                 task_unlock(p);
         } while_each_thread(g, p);