From: Oliver Neukum <oneu...@suse.com>

commit 08dff274edda54310d6f1cf27b62fddf0f8d146e upstream.

Counting break events is nice but we should actually report them to
the tty layer.

Fixes: 5a6a62bdb9257 ("cdc-acm: add TIOCMIWAIT")
Signed-off-by: Oliver Neukum <oneu...@suse.com>
Link: https://lore.kernel.org/r/20210311133714.31881-1-oneu...@suse.com
Cc: stable <sta...@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/usb/class/cdc-acm.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -313,8 +313,10 @@ static void acm_process_notification(str
                        acm->iocount.dsr++;
                if (difference & ACM_CTRL_DCD)
                        acm->iocount.dcd++;
-               if (newctrl & ACM_CTRL_BRK)
+               if (newctrl & ACM_CTRL_BRK) {
                        acm->iocount.brk++;
+                       tty_insert_flip_char(&acm->port, 0, TTY_BREAK);
+               }
                if (newctrl & ACM_CTRL_RI)
                        acm->iocount.rng++;
                if (newctrl & ACM_CTRL_FRAMING)


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