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From: Johan Hovold <johan@kernel.org>
To: Oliver Neukum <oneukum@suse.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	Johan Hovold <johan@kernel.org>,
	stable@vger.kernel.org
Subject: [PATCH 2/2] USB: cdc-acm: fix break reporting
Date: Wed, 29 Sep 2021 11:09:37 +0200	[thread overview]
Message-ID: <20210929090937.7410-3-johan@kernel.org> (raw)
In-Reply-To: <20210929090937.7410-1-johan@kernel.org>

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
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/class/cdc-acm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index c7a1736720e7..7b2e2420ecae 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -340,6 +340,9 @@ 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);
 
-- 
2.32.0


  parent reply	other threads:[~2021-09-29  9:10 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-29  9:09 [PATCH 0/2] " Johan Hovold
2021-09-29  9:09 ` [PATCH 1/2] USB: cdc-acm: fix racy tty buffer accesses Johan Hovold
2021-09-30  9:04   ` Oliver Neukum
2021-09-29  9:09 ` Johan Hovold [this message]
2021-09-30  9:05   ` [PATCH 2/2] USB: cdc-acm: fix break reporting Oliver Neukum

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