From patchwork Wed Aug 11 00:05:55 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ben Hutchings X-Patchwork-Id: 12429647 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=-17.2 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,URIBL_BLOCKED, USER_AGENT_SANE_1 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 6F760C4338F for ; Wed, 11 Aug 2021 00:06:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5015160EBD for ; Wed, 11 Aug 2021 00:06:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235608AbhHKAGW (ORCPT ); Tue, 10 Aug 2021 20:06:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56356 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235600AbhHKAGV (ORCPT ); Tue, 10 Aug 2021 20:06:21 -0400 Received: from mail-ed1-x52d.google.com (mail-ed1-x52d.google.com [IPv6:2a00:1450:4864:20::52d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D29DFC061765 for ; Tue, 10 Aug 2021 17:05:58 -0700 (PDT) Received: by mail-ed1-x52d.google.com with SMTP id x14so726573edr.12 for ; Tue, 10 Aug 2021 17:05:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mind.be; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=TmBklmtF6PgTKpjQdE419kaAahxa+pjIJXLUxre8OrA=; b=dUWOkifK3sn4MMtTFiJNvSMkEQ/2xwkZacFVMlQInmwPWfOdRpRahguGoy2B/EaTI+ oEBOou9ClBv1T5xQkDOOlP5+ajZrj3ymFkoVUsc3D53S9IKJLQw2OmMksvJcIF79pf9c qwv5a9+Gal5UEYZXCOvirJvJmN3HK16P5dibwKDMTlGeGTDjfIxgeWKh1IdkObwt+t6k wwJSG1f2Zb/nIOFNeb7PwXlA62gOnV3r7mKfIdip2BhGDLKglas/6TpyT6FBiACn/H5I hTSNQY5JZSV0tskD6A+9S6BGbAM6xhug+ERUVS0mWq8doe75CjzQocmjGzgeLMIWPWU9 vu8g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=TmBklmtF6PgTKpjQdE419kaAahxa+pjIJXLUxre8OrA=; b=bRNBNOPQKx3TsmrC145hYCedAXRW1Uun5TebvLWT/pAP/wQBK8QBHGBoggl6x/2znw f4VMQbApqFiMSHsURMsXXVnR/TMXX5t0Bj1Bdh9Uoc61P/YlAz46koP1eVkri+cn1U/Q MwjH4px2mlubNAvuhOIYI4oVj3AiwgFbZml56oYnLmJrU7X9F4sGioIK+a7/f7kxAM+o WeM7jZz+ICfav3ueigwcT0PAnBVVnyaVZx2VNyCjmh54ELGCJ6Zvd+g2s0gotny8vI6Y 6kWzzYGnEYrJp8Z37LxG4n03jTHFojvzgao5zoF7sLUBDXX9JSJJUquXZWTNVNXtSdAP WRsQ== X-Gm-Message-State: AOAM532xqlxN3Jjtbr50GlE2qqykCq5ATuai+a4ppWP/rbKBBpl62O0r 1hJM0A6YYjjo5GVLt9wEjwkX9g== X-Google-Smtp-Source: ABdhPJyaGPw/WJKgjrkYUlq2P0fjLqHi+nuB4GcdGn/4PWX4vEAOefhRFIsBSBOg3Fc6gCoEMmCsNA== X-Received: by 2002:a50:da0e:: with SMTP id z14mr8095533edj.73.1628640357400; Tue, 10 Aug 2021 17:05:57 -0700 (PDT) Received: from cephalopod (168.7-181-91.adsl-dyn.isp.belgacom.be. [91.181.7.168]) by smtp.gmail.com with ESMTPSA id t5sm3976119ejr.37.2021.08.10.17.05.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Aug 2021 17:05:57 -0700 (PDT) Date: Wed, 11 Aug 2021 02:05:55 +0200 From: Ben Hutchings To: Herbert Xu , "David S. Miller" Cc: linux-crypto@vger.kernel.org, linux-omap@vger.kernel.org, Lokesh Vutla , Tero Kristo , Francis Le Bourse Subject: [PATCH 1/2] crypto: omap - Avoid redundant copy when using truncated sg list Message-ID: <20210811000554.GB22095@cephalopod> References: <20210811000333.GA22095@cephalopod> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210811000333.GA22095@cephalopod> User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org omap_crypto_cleanup() currently copies data from sg to orig if either copy flag is set. However OMAP_CRYPTO_SG_COPIED means that sg refers to the same pages as orig, truncated to len bytes. There is no need to copy in this case. Only copy data if the OMAP_CRYPTO_DATA_COPIED flag is set. Fixes: 74ed87e7e7f7 ("crypto: omap - add base support library for common ...") Signed-off-by: Ben Hutchings --- This change was previously submitted as part of the patch at https://patchwork.kernel.org/project/linux-crypto/patch/1522164573-12259-1-git-send-email-francis.lebourse@sfr.fr/ . I couldn't find the full discussion of that in mailing list archives. Ben. drivers/crypto/omap-crypto.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/crypto/omap-crypto.c b/drivers/crypto/omap-crypto.c index 31bdb1d76d11..a4cc6bf146ec 100644 --- a/drivers/crypto/omap-crypto.c +++ b/drivers/crypto/omap-crypto.c @@ -210,7 +210,7 @@ void omap_crypto_cleanup(struct scatterlist *sg, struct scatterlist *orig, buf = sg_virt(sg); pages = get_order(len); - if (orig && (flags & OMAP_CRYPTO_COPY_MASK)) + if (orig && (flags & OMAP_CRYPTO_DATA_COPIED)) omap_crypto_copy_data(sg, orig, offset, len); if (flags & OMAP_CRYPTO_DATA_COPIED)