This is a note to let you know that I've just added the patch titled cdc-acm: fix BREAK rx code path adding necessary calls to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: cdc-acm-fix-break-rx-code-path-adding-necessary-calls.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 08dff274edda54310d6f1cf27b62fddf0f8d146e Mon Sep 17 00:00:00 2001 From: Oliver Neukum <oneukum@xxxxxxxx> Date: Thu, 11 Mar 2021 14:37:14 +0100 Subject: cdc-acm: fix BREAK rx code path adding necessary calls From: Oliver Neukum <oneukum@xxxxxxxx> 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@xxxxxxxx> Link: https://lore.kernel.org/r/20210311133714.31881-1-oneukum@xxxxxxxx Cc: stable <stable@xxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -324,8 +324,10 @@ 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) Patches currently in stable-queue which might be from oneukum@xxxxxxxx are queue-4.14/usb-cdc-acm-untangle-a-circular-dependency-between-callback-and-softint.patch queue-4.14/usb-cdc-acm-downgrade-message-to-debug.patch queue-4.14/cdc-acm-fix-break-rx-code-path-adding-necessary-calls.patch queue-4.14/usb-cdc-acm-fix-use-after-free-after-probe-failure.patch