From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 38538C10F14 for ; Thu, 3 Oct 2019 15:57:39 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F102020700 for ; Thu, 3 Oct 2019 15:57:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="K1o0QN7s"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="ID7ZgIkJ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F102020700 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=IwWJQdLBYURqYx4tKDFP/lbXjetLRMYAlmgVFxR5b+E=; b=K1o0QN7s86ITaO 4kP4DVXbxbM+jW8TrDlL7BVsqMzO/c4wCjnMm6M/ppp4JRxoJss/sjNx4jJ+BOMDddd+G5d5MM3wq R6Y9IRjLrBAqlgRCa7EZhHVnoTQb66rIA6c5aaXVoHhVqzL08C9iLqJecvfm6H4sC/k6eHQFFerOW EjOjMfVkEzn2SuUXvCaNeNUjen+/u0tkpOOoztsfi11pUHnFS4/oc39SloxdW9Q4UksixQ6phNcac pMn4jm12yIZVqzOPnLAezk0E7UCv/Nu3hp9iX3y8+2gIvMcIIe+kY37wnWke526nU6CV2irtVA+r+ Vf7uiNLi2zU1xvyqP08Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.2 #3 (Red Hat Linux)) id 1iG3U0-00068M-LI; Thu, 03 Oct 2019 15:57:36 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.2 #3 (Red Hat Linux)) id 1iG3Tw-00067Z-Ue for linux-mtd@lists.infradead.org; Thu, 03 Oct 2019 15:57:34 +0000 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 851B3207FF; Thu, 3 Oct 2019 15:57:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570118252; bh=+yVYbzi6NorjDufJSabcULv4qzLtVu0G7LVMv+Bk8DQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ID7ZgIkJqZEk6pVsnHKPf6XqkGHCzVpZR1sC3YkNLRfHCyLKGEhOAy2icUjAE7W2p y1UAKhVUAZ45cMIccyEJ08eqajlYpPnWa/pzy9LPxg4gE5+QzAgx6t73VEvTUp9UPv l1MX5VT/0klXgUhcE+Rwc6MqANabw1n0BEwCgXWE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Subject: [PATCH 4.4 06/99] mtd: cfi_cmdset_0002: Use chip_good() to retry in do_write_oneword() Date: Thu, 3 Oct 2019 17:52:29 +0200 Message-Id: <20191003154255.205877418@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003154252.297991283@linuxfoundation.org> References: <20191003154252.297991283@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191003_085733_036599_57B13DFB X-CRM114-Status: GOOD ( 15.59 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Tokunori Ikegami , Vignesh Raghavendra , Greg Kroah-Hartman , stable@vger.kernel.org, Joakim Tjernlund , Chris Packham , linux-mtd@lists.infradead.org, Hauke Mehrtens , Fabio Bettoni , Felix Fietkau Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-mtd" Errors-To: linux-mtd-bounces+linux-mtd=archiver.kernel.org@lists.infradead.org From: Tokunori Ikegami commit 37c673ade35c707d50583b5b25091ff8ebdeafd7 upstream. As reported by the OpenWRT team, write requests sometimes fail on some platforms. Currently to check the state chip_ready() is used correctly as described by the flash memory S29GL256P11TFI01 datasheet. Also chip_good() is used to check if the write is succeeded and it was implemented by the commit fb4a90bfcd6d8 ("[MTD] CFI-0002 - Improve error checking"). But actually the write failure is caused on some platforms and also it can be fixed by using chip_good() to check the state and retry instead. Also it seems that it is caused after repeated about 1,000 times to retry the write one word with the reset command. By using chip_good() to check the state to be done it can be reduced the retry with reset. It is depended on the actual flash chip behavior so the root cause is unknown. Cc: Chris Packham Cc: Joakim Tjernlund Cc: linux-mtd@lists.infradead.org Cc: stable@vger.kernel.org Reported-by: Fabio Bettoni Signed-off-by: Felix Fietkau Signed-off-by: Hauke Mehrtens Signed-off-by: Tokunori Ikegami [vigneshr@ti.com: Fix a checkpatch warning] Signed-off-by: Vignesh Raghavendra Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/chips/cfi_cmdset_0002.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) --- a/drivers/mtd/chips/cfi_cmdset_0002.c +++ b/drivers/mtd/chips/cfi_cmdset_0002.c @@ -1626,29 +1626,35 @@ static int __xipram do_write_oneword(str continue; } - if (time_after(jiffies, timeo) && !chip_ready(map, adr)){ + /* + * We check "time_after" and "!chip_good" before checking + * "chip_good" to avoid the failure due to scheduling. + */ + if (time_after(jiffies, timeo) && !chip_good(map, adr, datum)) { xip_enable(map, chip, adr); printk(KERN_WARNING "MTD %s(): software timeout\n", __func__); xip_disable(map, chip, adr); + ret = -EIO; break; } - if (chip_ready(map, adr)) + if (chip_good(map, adr, datum)) break; /* Latency issues. Drop the lock, wait a while and retry */ UDELAY(map, chip, adr, 1); } + /* Did we succeed? */ - if (!chip_good(map, adr, datum)) { + if (ret) { /* reset on all failures. */ map_write( map, CMD(0xF0), chip->start ); /* FIXME - should have reset delay before continuing */ - if (++retry_cnt <= MAX_RETRIES) + if (++retry_cnt <= MAX_RETRIES) { + ret = 0; goto retry; - - ret = -EIO; + } } xip_enable(map, chip, adr); op_done: ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/