USB: fix cdc-acm regression in open

commit 7af25b4b34a2439020d78da765a3bed0ff73f25c upstream.

cdc-acm needs to set a flag during open to tell the
tty layer that the device is initialized

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Cc: Marcel Holtmann <marcel@holtmann.org>
Cc: Paul Martin <pm@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 2bfc41ece0e1d2df04ab058f742e76fd7b7749e9..b8134ad5f05f30317820e091900e477e189c58c3 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -59,6 +59,7 @@
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/tty.h>
+#include <linux/serial.h>
 #include <linux/tty_driver.h>
 #include <linux/tty_flip.h>
 #include <linux/module.h>
@@ -609,6 +610,7 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
        acm->throttle = 0;
 
        tasklet_schedule(&acm->urb_task);
+       set_bit(ASYNCB_INITIALIZED, &acm->port.flags);
        rv = tty_port_block_til_ready(&acm->port, tty, filp);
 done:
        mutex_unlock(&acm->mutex);