From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793213255; b=Od+qIlEcQ6PghduiCCISBH5BseQXuBKaRGobMmzuAJp0VX6DAS7LszHHrAmOb3FuwXdk DtKvkBQtwe0jQX342iMgC+Gvtb1FzSZpAbOi1jhOZR6hiYtbrE6niKLPp9kPbDk5i31JQ CeA5zU7SbKR0bC/72XgfVzBuC3b8bftKi2JO63QvdslKSc3Mv0mxqf7i75zQ6731dMaXS lkfMlMl53r3GruUPYl722Df2LbNjh3dV2cpWK3OBS1NH7v5k7lIpUJY8Kdp72+r1OfJKx 8pgVZb22d29+3F4GzYeucoRsnK/jt5+VSwI+Fv5MokmS9YNBJ3Zt0wKaP3xupwHg4Tg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793213255; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=enpu/ZRkUMSx4pAfR4+vZepczs0RCkQJ6YWhIh36tko=; b=MqdIidyDbB1w8gOeWGYRAVp4L5HPIqAftHl+rbzCrFZoLraHx9ruCkUz4jTq8h0+X2Ah shJuG8m+MPnNvMI7VF2+Q+feCWXtBLTzIPtc6g8Y9RCagW6M6ut5drhqi/yAciZ62iSEQ CaSDUtpXT3YK8zt8XbdNHzJmS55ZCwqW6XLawNI7DCT3VDPPu4If0zUkMuqFCwjYuE9kJ JFg71a/h5JbRPskOq7XbojDssiMZKMZl7q6Pv7UkJbf5XtIIgXM+b79ebDS126zL7o5Oi x350Ywrmfv0rjqZhdzimMGXI4UseVQ55GwpVa4XM7rWjvfcUgYPjvRF4juiyf5P185g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=hnQlLIp2; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CA226606A31C; Wed, 28 Oct 2026 18:47:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=hnQlLIp2 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 25DFC1F01828; Wed, 28 Oct 2026 18:47:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793213254; bh=enpu/ZRkUMSx4pAfR4+vZepczs0RCkQJ6YWhIh36tko=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=hnQlLIp2DHzIe37UMlke+Ykxc2anBbUexKh8MUmmSa37SRHCSbIOBMDi5v2x3n8BF doNqVm83nQkc2kr0fzgPWWfFnWZTVPlpuSZl8j+rQLfHfyufbxueQ2cVNui10ViVGj BxfoeaqlZr9SDKz3K+ybwE2O3LgxtgSFlOw1Ts98= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Corey Minyard , Johan Hovold , Sasha Levin Subject: [PATCH 6.1 0397/1887] USB: serial: report unsupported break signalling Date: Wed, 28 Oct 2026 17:41:33 +0100 Message-ID: <20261028170508.268560628@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028170459.200466217@linuxfoundation.org> References: <20261028170459.200466217@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list 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 [ Upstream commit c9d934053d9e850bc901b6425eacb5fe3d4b1738 ] Instead of returning success when a driver does not support break signalling, return an error to let user space know and to avoid waiting when break is not supported. Tested-by: Corey Minyard Signed-off-by: Johan Hovold Stable-dep-of: ae0e61d95677 ("USB: serial: fix ioctl hangup race") Signed-off-by: Sasha Levin --- drivers/usb/serial/usb-serial.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index d0f9db08125e0..9ecc108c2d275 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -540,7 +540,7 @@ static int serial_break(struct tty_struct *tty, int break_state) if (port->serial->type->break_ctl) return port->serial->type->break_ctl(tty, break_state); - return 0; + return -ENOTTY; } static int serial_proc_show(struct seq_file *m, void *v) -- 2.53.0