From patchwork Fri Jun 4 10:02:51 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Walle X-Patchwork-Id: 1487720 X-Patchwork-Delegate: vigneshr@ti.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.infradead.org (client-ip=2607:7c80:54:e::133; helo=bombadil.infradead.org; envelope-from=linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; secure) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=tqLhKVGr; dkim=fail reason="signature verification failed" (1024-bit key; secure) header.d=walle.cc header.i=@walle.cc header.a=rsa-sha256 header.s=mail2016061301 header.b=JjCYyTPt; dkim-atps=neutral Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4FxJb74MyNz9sT6 for ; Fri, 4 Jun 2021 20:16:51 +1000 (AEST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=y9c6eA06ULJAFwEztLlSQJqi8AIcZq4j3/3f7GAl/0w=; b=tqLhKVGrpr6OHE tqobgsbwGco/ud6KLEzMSAjfkqBVrdjaTjvyOBoOEOMZhn+ZZxigPTf6VvYHaPGb4fyD+axmmJMZb h/BRQ6xDTCKMgTs5WTboIOI38VMRcQAxiHm4QtbYnhzEj3CGVOu/LZZnU+nb+P4S5Ugwf8PK5Er6p b85RaD9wTGC6gc8OenPmFXnO8uXsBp5IS+Oas3tY1QFJlXGFf/Ou0hk+88xJuHdqWxkSRpHD76L9x uqy42//RsZbGifSO73vwTnIjP+YQCoUK27F0mRa1PmYZgEtTkQEz5ughxS72OzEhompEEGbSt91Pw VP9SJHhFkDPRL9W1cLjw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1lp6sA-00CtiD-Pv; Fri, 04 Jun 2021 10:16:15 +0000 Received: from ssl.serverraum.org ([2a01:4f8:151:8464::1:2]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1lp6fU-00Cn0K-Vu for linux-mtd@lists.infradead.org; Fri, 04 Jun 2021 10:03:18 +0000 Received: from mwalle01.fritz.box (ip4d17858c.dynamic.kabel-deutschland.de [77.23.133.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-384) server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by ssl.serverraum.org (Postfix) with ESMTPSA id 3F79C22253; Fri, 4 Jun 2021 12:03:04 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=walle.cc; s=mail2016061301; t=1622800984; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=24M02QFwLfv0Ndp7lFLCOjioGUUvuEqyzsacb1UNRDI=; b=JjCYyTPt9e/rdqKAgaqxvDFbyeGulWL32jQaCBU/cv5oN9Diry2gmMP7/Q3Ai7Fsf6fjoS FFklOepw0pEoiXbkwEYEiM9oR5QF5434m4H4kWuudz2UhTTQtwxMYLZSGPc3Zdcs0eWcUz HMtSowWh0XT7L/u80lGBB/u2Zk759Wc= From: Michael Walle To: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Tudor Ambarus , Michael Walle , Pratyush Yadav , Miquel Raynal , Richard Weinberger , Vignesh Raghavendra Subject: [PATCH v5 4/5] mtd: spi-nor: otp: simplify length check Date: Fri, 4 Jun 2021 12:02:51 +0200 Message-Id: <20210604100252.9975-5-michael@walle.cc> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210604100252.9975-1-michael@walle.cc> References: <20210604100252.9975-1-michael@walle.cc> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210604_030309_271439_9DF16504 X-CRM114-Status: GOOD ( 16.34 ) X-Spam-Score: -2.5 (--) X-Spam-Report: Spam detection software, running on the system "bombadil.infradead.org", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: By moving the code around a bit, we can just check the length before calling spi_nor_mtd_otp_range_is_locked() and drop the length check there. This way we don't need to take the lock. This will also [...] Content analysis details: (-2.5 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [2a01:4f8:151:8464:0:0:1:2 listed in] [list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-mtd" Errors-To: linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org By moving the code around a bit, we can just check the length before calling spi_nor_mtd_otp_range_is_locked() and drop the length check there. This way we don't need to take the lock. This will also skip the "*retlen = 0" assignment if the length is zero. But mtdcore already does that for us. Thus we can drop that, too. Signed-off-by: Michael Walle Reviewed-by: Tudor Ambarus --- drivers/mtd/spi-nor/otp.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/drivers/mtd/spi-nor/otp.c b/drivers/mtd/spi-nor/otp.c index 063f8fb68649..89fe52e3851a 100644 --- a/drivers/mtd/spi-nor/otp.c +++ b/drivers/mtd/spi-nor/otp.c @@ -256,9 +256,6 @@ static int spi_nor_mtd_otp_range_is_locked(struct spi_nor *nor, loff_t ofs, unsigned int region; int locked; - if (!len) - return 0; - /* * If any of the affected OTP regions are locked the entire range is * considered locked. @@ -290,13 +287,16 @@ static int spi_nor_mtd_otp_read_write(struct mtd_info *mtd, loff_t ofs, if (ofs < 0 || ofs >= spi_nor_otp_size(nor)) return 0; + /* don't access beyond the end */ + total_len = min_t(size_t, total_len, spi_nor_otp_size(nor) - ofs); + + if (!total_len) + return 0; + ret = spi_nor_lock_and_prep(nor); if (ret) return ret; - /* don't access beyond the end */ - total_len = min_t(size_t, total_len, spi_nor_otp_size(nor) - ofs); - if (is_write) { ret = spi_nor_mtd_otp_range_is_locked(nor, ofs, total_len); if (ret < 0) { @@ -307,7 +307,6 @@ static int spi_nor_mtd_otp_read_write(struct mtd_info *mtd, loff_t ofs, } } - *retlen = 0; while (total_len) { /* * The OTP regions are mapped into a contiguous area starting