PTY: add kernel parameter to overwrite legacy pty count

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index de14aea34e11..73de77105fea 100644
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -248,14 +248,19 @@ static int pty_bsd_ioctl(struct tty_struct *tty, struct file *file,
         return -ENOIOCTLCMD;
 }
 
+static int legacy_count = CONFIG_LEGACY_PTY_COUNT;
+module_param(legacy_count, int, 0);
+
 static void __init legacy_pty_init(void)
 {
+        if (legacy_count <= 0)
+                return;
 
-        pty_driver = alloc_tty_driver(NR_PTYS);
+        pty_driver = alloc_tty_driver(legacy_count);
         if (!pty_driver)
                 panic("Couldn't allocate pty driver");
 
-        pty_slave_driver = alloc_tty_driver(NR_PTYS);
+        pty_slave_driver = alloc_tty_driver(legacy_count);
         if (!pty_slave_driver)
                 panic("Couldn't allocate pty slave driver");