From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E627C26ED41; Fri, 9 Jan 2026 12:24:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767961449; cv=none; b=WUPCnazwHx/1bxsyYOsXxzyodyvZANKD3wObi5XEBcnvL/6D6ujrZn+4i3uutufBV6fRAK/nGjxL8f0g/EibIohdiZK1UilVnVjToXeRG3XPJvxMlROP2YEN51uWFiyu1FHt60rB4Yr2NGmJVSlKwuxQAMH9710IEQOOBs06sWU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767961449; c=relaxed/simple; bh=gmM5Gul3z4I4TdyIwS0zMNE8j7sLCDvVRcHbVPrFYCU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DC6gSyKW3lE44eoe9QX5yJgQxHKOUh55CB79auPnjLv6xEpNnuV6KOB1ZUAXOaNKwwyGs6X0eXBKtq3RPfoCT+lo8YfCZ9YnOkVSD80mcshiqqVuRLeGNQwdezVx/gGpvZnNZyKDfDjh/NCJLK0HeJ8QlLH1vVUdHiYFhu9K8+E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=r9tY46fv; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="r9tY46fv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 72C5FC4CEF1; Fri, 9 Jan 2026 12:24:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1767961448; bh=gmM5Gul3z4I4TdyIwS0zMNE8j7sLCDvVRcHbVPrFYCU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=r9tY46fvW1YG+VjHe72wbMk/I4iG9O2wEmlyZPQR9zhzAvvGhc0V5l+yyo6NJAE1/ AsnnJN/yp4eFu/aZ0podSY5EIcIXk789tvpUDDq3uw/fgrGUwBpOsDkgVfiolDMWih szTmH40mmT6H3hkYmcKXrmm/yOJXR+X9KIfylmKE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Johan Hovold Subject: [PATCH 6.1 019/634] USB: serial: belkin_sa: fix TIOCMBIS and TIOCMBIC Date: Fri, 9 Jan 2026 12:34:57 +0100 Message-ID: <20260109112118.158872014@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260109112117.407257400@linuxfoundation.org> References: <20260109112117.407257400@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit b6e0b3016187446ddef9edac03cd9d544ac63f11 upstream. Asserting or deasserting a modem control line using TIOCMBIS or TIOCMBIC should not deassert any lines that are not in the mask. Fix this long-standing regression dating back to 2003 when the tiocmset() callback was introduced. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Reviewed-by: Greg Kroah-Hartman Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/belkin_sa.c | 28 +++++++++++++++++----------- 1 file changed, 17 insertions(+), 11 deletions(-) --- a/drivers/usb/serial/belkin_sa.c +++ b/drivers/usb/serial/belkin_sa.c @@ -430,7 +430,7 @@ static int belkin_sa_tiocmset(struct tty struct belkin_sa_private *priv = usb_get_serial_port_data(port); unsigned long control_state; unsigned long flags; - int retval; + int retval = 0; int rts = 0; int dtr = 0; @@ -447,26 +447,32 @@ static int belkin_sa_tiocmset(struct tty } if (clear & TIOCM_RTS) { control_state &= ~TIOCM_RTS; - rts = 0; + rts = 1; } if (clear & TIOCM_DTR) { control_state &= ~TIOCM_DTR; - dtr = 0; + dtr = 1; } priv->control_state = control_state; spin_unlock_irqrestore(&priv->lock, flags); - retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts); - if (retval < 0) { - dev_err(&port->dev, "Set RTS error %d\n", retval); - goto exit; + if (rts) { + retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, + !!(control_state & TIOCM_RTS)); + if (retval < 0) { + dev_err(&port->dev, "Set RTS error %d\n", retval); + goto exit; + } } - retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr); - if (retval < 0) { - dev_err(&port->dev, "Set DTR error %d\n", retval); - goto exit; + if (dtr) { + retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, + !!(control_state & TIOCM_DTR)); + if (retval < 0) { + dev_err(&port->dev, "Set DTR error %d\n", retval); + goto exit; + } } exit: return retval;