From patchwork Mon Dec 28 12:45:45 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 354748 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 A887BC4332B for ; Mon, 28 Dec 2020 14:54:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 80880221F0 for ; Mon, 28 Dec 2020 14:54:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2441499AbgL1ORq (ORCPT ); Mon, 28 Dec 2020 09:17:46 -0500 Received: from mail.kernel.org ([198.145.29.99]:52536 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2501883AbgL1ORe (ORCPT ); Mon, 28 Dec 2020 09:17:34 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id A7B81207A9; Mon, 28 Dec 2020 14:16:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609165008; bh=J8EDAHR5nrjdH7QAF5tISe7lha4W7Duhqv6amCs6azE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mDZmqz3NfbvXJpt9yFDVkSHLXA9K8AJhwcFhJw6aSx6ZnMcBNlDOIyjXzW3kc735P Z+6q5yvt0iwxeB1h/M45XIxO6zh2zw/HKoLiorrhCzKTGPOVX1tq4mp6Y2zOMXotgK 8f37FPnC5+SiwxtaBT3BK96K0hgV6380OlG1iglo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Michael Walle , Vignesh Raghavendra , Tudor Ambarus , Sasha Levin Subject: [PATCH 5.10 347/717] mtd: spi-nor: ignore errors in spi_nor_unlock_all() Date: Mon, 28 Dec 2020 13:45:45 +0100 Message-Id: <20201228125037.652430535@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228125020.963311703@linuxfoundation.org> References: <20201228125020.963311703@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Michael Walle [ Upstream commit bdb1a75e4b9df6861ec6a6e3e3997820d3cebabe ] Just try to unlock the whole SPI-NOR flash array. Don't abort the probing in case of an error. Justifications: (1) For some boards, this just works because spi_nor_write_16bit_sr_and_check() is broken and just checks the second half of the 16bit. Once that will be fixed, SPI probe will fail for boards which has hardware-write protected SPI-NOR flashes. (2) Until now, hardware write-protection was the only viable solution to use the block protection bits. This is because this very function spi_nor_unlock_all() will be called unconditionally on every linux boot. Therefore, this bits only makes sense in combination with the hardware write-protection. If we would fail the SPI probe on an error in spi_nor_unlock_all() we'd break virtually all users of the block protection bits. (3) We should try hard to keep the MTD working even if the flash might not be writable/erasable. Fixes: 3e0930f109e7 ("mtd: spi-nor: Rework the disabling of block write protection") Signed-off-by: Michael Walle Signed-off-by: Vignesh Raghavendra Reviewed-by: Tudor Ambarus Link: https://lore.kernel.org/r/20201203162959.29589-3-michael@walle.cc Signed-off-by: Sasha Levin --- drivers/mtd/spi-nor/core.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c index f0ae7a01703a1..61b00d4965475 100644 --- a/drivers/mtd/spi-nor/core.c +++ b/drivers/mtd/spi-nor/core.c @@ -2915,20 +2915,27 @@ static int spi_nor_quad_enable(struct spi_nor *nor) } /** - * spi_nor_unlock_all() - Unlocks the entire flash memory array. + * spi_nor_try_unlock_all() - Tries to unlock the entire flash memory array. * @nor: pointer to a 'struct spi_nor'. * * Some SPI NOR flashes are write protected by default after a power-on reset * cycle, in order to avoid inadvertent writes during power-up. Backward * compatibility imposes to unlock the entire flash memory array at power-up * by default. + * + * Unprotecting the entire flash array will fail for boards which are hardware + * write-protected. Thus any errors are ignored. */ -static int spi_nor_unlock_all(struct spi_nor *nor) +static void spi_nor_try_unlock_all(struct spi_nor *nor) { - if (nor->flags & SNOR_F_HAS_LOCK) - return spi_nor_unlock(&nor->mtd, 0, nor->params->size); + int ret; - return 0; + if (!(nor->flags & SNOR_F_HAS_LOCK)) + return; + + ret = spi_nor_unlock(&nor->mtd, 0, nor->params->size); + if (ret) + dev_dbg(nor->dev, "Failed to unlock the entire flash memory array\n"); } static int spi_nor_init(struct spi_nor *nor) @@ -2941,11 +2948,7 @@ static int spi_nor_init(struct spi_nor *nor) return err; } - err = spi_nor_unlock_all(nor); - if (err) { - dev_dbg(nor->dev, "Failed to unlock the entire flash memory array\n"); - return err; - } + spi_nor_try_unlock_all(nor); if (nor->addr_width == 4 && !(nor->flags & SNOR_F_4B_OPCODES)) { /*