From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:45398 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751552AbdFZNmX (ORCPT ); Mon, 26 Jun 2017 09:42:23 -0400 Subject: Patch "mtd: spi-nor: fix spansion quad enable" has been added to the 4.4-stable tree To: joel.esponde@honeywell.com, amit.pundir@linaro.org, cyrille.pitchen@atmel.com, gregkh@linuxfoundation.org Cc: , From: Date: Mon, 26 Jun 2017 15:41:11 +0200 Message-ID: <149848447153254@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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 mtd: spi-nor: fix spansion quad enable to the 4.4-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: mtd-spi-nor-fix-spansion-quad-enable.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 807c16253319ee6ccf8873ae64f070f7eb532cd5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jo=C3=ABl=20Esponde?= Date: Wed, 23 Nov 2016 12:47:40 +0100 Subject: mtd: spi-nor: fix spansion quad enable MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Joël Esponde commit 807c16253319ee6ccf8873ae64f070f7eb532cd5 upstream. With the S25FL127S nor flash part, each writing to the configuration register takes hundreds of ms. During that time, no more accesses to the flash should be done (even reads). This commit adds a wait loop after the register writing until the flash finishes its work. This issue could make rootfs mounting fail when the latter was done too much closely to this quad enable bit setting step. And in this case, a driver as UBIFS may try to recover the filesystem and may broke it completely. Signed-off-by: Joël Esponde Signed-off-by: Cyrille Pitchen Signed-off-by: Amit Pundir Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/spi-nor/spi-nor.c | 7 +++++++ 1 file changed, 7 insertions(+) --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -1057,6 +1057,13 @@ static int spansion_quad_enable(struct s return -EINVAL; } + ret = spi_nor_wait_till_ready(nor); + if (ret) { + dev_err(nor->dev, + "timeout while writing configuration register\n"); + return ret; + } + /* read back and check it */ ret = read_cr(nor); if (!(ret > 0 && (ret & CR_QUAD_EN_SPAN))) { Patches currently in stable-queue which might be from joel.esponde@honeywell.com are queue-4.4/mtd-spi-nor-fix-spansion-quad-enable.patch