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 360EC3C00BE; Thu, 15 Jan 2026 17:14:24 +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=1768497264; cv=none; b=Fu8EjNgyK3qpgisj3B73smUXFcD83RdYr2F8DIx212Zmhnd3C1Au/8ycX/HKW//SFTWsxavQrFvXqgNJzAxZTZ/mTXCZHi4AbM9rQ1P3QAbf/Qf6PECAJuHYlpgRmKHYLi29UhKPeHg2vH20JVvHLWu2MDeZcQYBhVXSuTTg/WM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768497264; c=relaxed/simple; bh=By+5M5Lbt2O8UuTxYY0MgajvQlg/tmin/D7RrXnkW9Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=R1kSF+XSZgzuCr9fuyyS3Qi6A+MpXYWEaqk4Ra/OT2vTNUME/M5Q1SRrk9JjFAOT/vaUAZnbPa4ANwaRlSKRKj7sflh/fmpI93DUmU+ooDahWaVWbGT+8icUwMkr/ENhWyk4FdvoSCMcprgPXL6VpA6SQHjkmPvFITdwy11o0Fo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=2G68ukKd; 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="2G68ukKd" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9DB95C116D0; Thu, 15 Jan 2026 17:14:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1768497264; bh=By+5M5Lbt2O8UuTxYY0MgajvQlg/tmin/D7RrXnkW9Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2G68ukKdXcUf1D3QGB602Z9pzavrW0SJjiAiCS5DvLPkdatjkH69eOOla4ZfCct5+ dSGNMshw8h0NmhVkq0QQ3ARFCdjFHb4dUq6KflKtarXSQvj/d9vq7H3X5SGr/pbyPh tKDhtmwkBG/knHG+G49kOqsDFHeY7Vs4eEeTmOk4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Johan Hovold Subject: [PATCH 5.15 020/554] USB: serial: belkin_sa: fix TIOCMBIS and TIOCMBIC Date: Thu, 15 Jan 2026 17:41:26 +0100 Message-ID: <20260115164246.972860403@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260115164246.225995385@linuxfoundation.org> References: <20260115164246.225995385@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 5.15-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 @@ -428,7 +428,7 @@ 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; @@ -445,26 +445,32 @@ 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;