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USB: cdc-acm: fix break reporting 

commit 58fc1daa4d2e9789b9ffc880907c961ea7c062cc upstream.

A recent change that started reporting break events forgot to push the
event to the line discipline, which meant that a detected break would
not be reported until further characters had been receive (the port
could even have been closed and reopened in between).

Fixes: 08dff274edda ("cdc-acm: fix BREAK rx code path adding necessary calls")
Cc: stable@vger.kernel.org
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210929090937.7410-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2021-09-29 11:09:37 +02:00 committed by Greg Kroah-Hartman
parent 3135935b7f
commit b53aa224ad
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/class/cdc-acm.c
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@ -339,6 +339,9 @@ static void acm_process_notification(struct acm *acm, unsigned char *buf)
acm->iocount.overrun++;
spin_unlock_irqrestore(&acm->read_lock, flags);
if (newctrl & ACM_CTRL_BRK)
tty_flip_buffer_push(&acm->port);
if (difference)
wake_up_all(&acm->wioctl);