cdc-acm: fix BREAK rx code path adding necessary calls

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 <oneukum@suse.com>
Link: https://lore.kernel.org/r/20210311133714.31881-1-oneukum@suse.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 8d20e4ff1b803605adf4aea54f8a38e5edaf8d30..afb35b18a2ce4d8a0c09bcbbf58973a95221e3c2 100644 (file)
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -324,8 +324,10 @@ static void acm_process_notification(struct acm *acm, unsigned char *buf)
                        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)