From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:56306 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751057AbeAVNe7 (ORCPT ); Mon, 22 Jan 2018 08:34:59 -0500 Subject: Patch "MIPS: AR7: ensure the port type's FCR value is used" has been added to the 4.9-stable tree To: jonas.gorski@gmail.com, f.fainelli@gmail.com, gregkh@linuxfoundation.org, jhogan@kernel.org, nschichan@freebox.fr, ralf@linux-mips.org, yoshihiro.yunomae.ez@hitachi.com Cc: , From: Date: Mon, 22 Jan 2018 14:34:58 +0100 Message-ID: <15166280985098@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled MIPS: AR7: ensure the port type's FCR value is used to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mips-ar7-ensure-the-port-type-s-fcr-value-is-used.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 0a5191efe06b5103909206e4fbcff81d30283f8e Mon Sep 17 00:00:00 2001 From: Jonas Gorski Date: Sun, 29 Oct 2017 16:27:21 +0100 Subject: MIPS: AR7: ensure the port type's FCR value is used From: Jonas Gorski commit 0a5191efe06b5103909206e4fbcff81d30283f8e upstream. Since commit aef9a7bd9b67 ("serial/uart/8250: Add tunable RX interrupt trigger I/F of FIFO buffers"), the port's default FCR value isn't used in serial8250_do_set_termios anymore, but copied over once in serial8250_config_port and then modified as needed. Unfortunately, serial8250_config_port will never be called if the port is shared between kernel and userspace, and the port's flag doesn't have UPF_BOOT_AUTOCONF, which would trigger a serial8250_config_port as well. This causes garbled output from userspace: [ 5.220000] random: procd urandom read with 49 bits of entropy available ers [kee Fix this by forcing it to be configured on boot, resulting in the expected output: [ 5.250000] random: procd urandom read with 50 bits of entropy available Press the [f] key and hit [enter] to enter failsafe mode Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level Fixes: aef9a7bd9b67 ("serial/uart/8250: Add tunable RX interrupt trigger I/F of FIFO buffers") Signed-off-by: Jonas Gorski Cc: Greg Kroah-Hartman Cc: Yoshihiro YUNOMAE Cc: Florian Fainelli Cc: Nicolas Schichan Cc: linux-mips@linux-mips.org Cc: linux-serial@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/17544/ Signed-off-by: Ralf Baechle Cc: James Hogan Signed-off-by: Greg Kroah-Hartman --- arch/mips/ar7/platform.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/mips/ar7/platform.c +++ b/arch/mips/ar7/platform.c @@ -576,7 +576,7 @@ static int __init ar7_register_uarts(voi uart_port.type = PORT_AR7; uart_port.uartclk = clk_get_rate(bus_clk) / 2; uart_port.iotype = UPIO_MEM32; - uart_port.flags = UPF_FIXED_TYPE; + uart_port.flags = UPF_FIXED_TYPE | UPF_BOOT_AUTOCONF; uart_port.regshift = 2; uart_port.line = 0; Patches currently in stable-queue which might be from jonas.gorski@gmail.com are queue-4.9/mips-ar7-ensure-the-port-type-s-fcr-value-is-used.patch