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    Subject[PATCH 5.10 109/126] cdc-acm: fix BREAK rx code path adding necessary calls
    Date
    From: Oliver Neukum <oneukum@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 <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>
    ---
    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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