From patchwork Sun Oct 15 09:19:46 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gilad Ben-Yossef X-Patchwork-Id: 10006809 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A778C60230 for ; Sun, 15 Oct 2017 09:22:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 987A4205A4 for ; Sun, 15 Oct 2017 09:22:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8CFB428CA0; Sun, 15 Oct 2017 09:22:11 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 2B698205A4 for ; Sun, 15 Oct 2017 09:22:11 +0000 (UTC) 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:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: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=3B8LnNr+26GVMpJxa38XQMO2Kf5h8VrwhEYc4SfsnbE=; b=bKw1aXms3/XKbsA7HZkVn8BYRT SiY7Md7X8tUVKNPbpJx4O9NgpeD3Z+/DGCp2pcZ2aGBxMBD4Qp48Jxp/ZgYK2jD7YVnB6LfHSK/Vh UoHZUdnctFKSo8j8SRRFhq5Q6gVyq7Mui8TV+ju1RfkrBVdZG/se27fno15PsLJtYlBg0+kqKPzFu DGCzaWJ7b+x3T3OTV4FIGAi2vvIG8obCAHlAuk9AzeUTopxNVihQ4Ez4Yg8t+Gt4Kl+L4sgtvJLfc ETRO82Rmt15+5LtxQb/5ZS5QtVSLfEb3yQhRMzH8ZlPvw729Vj2joxE6SQsKOZeUX34nDnnvOw5Bh hSBQdlqw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1e3f7W-00037s-Q9; Sun, 15 Oct 2017 09:22:06 +0000 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70] helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1e3f7G-0002nG-Mr; Sun, 15 Oct 2017 09:21:59 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id F1C1515A2; Sun, 15 Oct 2017 02:21:30 -0700 (PDT) Received: from localhost.localdomain (usa-sjc-mx-foss1.foss.arm.com [217.140.101.70]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DBE473F3E1; Sun, 15 Oct 2017 02:21:22 -0700 (PDT) From: Gilad Ben-Yossef To: Herbert Xu , "David S. Miller" , Jonathan Corbet , David Howells , Tom Lendacky , Gary Hook , Boris Brezillon , Arnaud Ebalard , Matthias Brugger , Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, Steve French , "Theodore Y. Ts'o" , Jaegeuk Kim , Steffen Klassert , Alexey Kuznetsov , Hideaki YOSHIFUJI , Mimi Zohar , Dmitry Kasatkin , James Morris , "Serge E. Hallyn" Subject: [PATCH v9 01/20] crypto: change transient busy return code to -EAGAIN Date: Sun, 15 Oct 2017 10:19:46 +0100 Message-Id: <1508059209-25529-2-git-send-email-gilad@benyossef.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1508059209-25529-1-git-send-email-gilad@benyossef.com> References: <1508059209-25529-1-git-send-email-gilad@benyossef.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20171015_022151_460497_690B81E7 X-CRM114-Status: GOOD ( 12.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-cifs@vger.kernel.org, linux-doc@vger.kernel.org, linux-ima-user@lists.sourceforge.net, netdev@vger.kernel.org, samba-technical@lists.samba.org, linux-kernel@vger.kernel.org, linux-fscrypt@vger.kernel.org, keyrings@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-crypto@vger.kernel.org, linux-security-module@vger.kernel.org, linux-ima-devel@lists.sourceforge.net, linux-arm-kernel@lists.infradead.org, Ofir Drang MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The crypto API was using the -EBUSY return value to indicate both a hard failure to submit a crypto operation into a transformation provider when the latter was busy and the backlog mechanism was not enabled as well as a notification that the operation was queued into the backlog when the backlog mechanism was enabled. Having the same return code indicate two very different conditions depending on a flag is both error prone and requires extra runtime check like the following to discern between the cases: if (err == -EINPROGRESS || (err == -EBUSY && (ahash_request_flags(req) & CRYPTO_TFM_REQ_MAY_BACKLOG))) This patch changes the return code used to indicate a crypto op failed due to the transformation provider being transiently busy to -EAGAIN. Signed-off-by: Gilad Ben-Yossef --- crypto/algapi.c | 6 ++++-- crypto/cryptd.c | 4 +--- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/crypto/algapi.c b/crypto/algapi.c index aa699ff..916bee3 100644 --- a/crypto/algapi.c +++ b/crypto/algapi.c @@ -897,9 +897,11 @@ int crypto_enqueue_request(struct crypto_queue *queue, int err = -EINPROGRESS; if (unlikely(queue->qlen >= queue->max_qlen)) { - err = -EBUSY; - if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) + if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG)) { + err = -EAGAIN; goto out; + } + err = -EBUSY; if (queue->backlog == &queue->list) queue->backlog = &request->list; } diff --git a/crypto/cryptd.c b/crypto/cryptd.c index 0508c48..d1dbdce 100644 --- a/crypto/cryptd.c +++ b/crypto/cryptd.c @@ -137,16 +137,14 @@ static int cryptd_enqueue_request(struct cryptd_queue *queue, int cpu, err; struct cryptd_cpu_queue *cpu_queue; atomic_t *refcnt; - bool may_backlog; cpu = get_cpu(); cpu_queue = this_cpu_ptr(queue->cpu_queue); err = crypto_enqueue_request(&cpu_queue->queue, request); refcnt = crypto_tfm_ctx(request->tfm); - may_backlog = request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG; - if (err == -EBUSY && !may_backlog) + if (err == -EAGAIN) goto out_put_cpu; queue_work_on(cpu, kcrypto_wq, &cpu_queue->work);