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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" Date: Sun, 15 Oct 2017 10:19:46 +0100 Message-Id: <1508059209-25529-2-git-send-email-gilad@benyossef.com> In-Reply-To: <1508059209-25529-1-git-send-email-gilad@benyossef.com> References: <1508059209-25529-1-git-send-email-gilad@benyossef.com> X-Greylist: Sender passed SPF test, Sender IP whitelisted by DNSRBL, ACL 205 matched, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Sun, 15 Oct 2017 09:21:31 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Sun, 15 Oct 2017 09:21:31 +0000 (UTC) for IP:'217.140.101.70' DOMAIN:'usa-sjc-mx-foss1.foss.arm.com' HELO:'foss.arm.com' FROM:'gilad@benyossef.com' RCPT:'' X-RedHat-Spam-Score: -5 (RCVD_IN_DNSWL_HI) 217.140.101.70 usa-sjc-mx-foss1.foss.arm.com 217.140.101.70 usa-sjc-mx-foss1.foss.arm.com X-Scanned-By: MIMEDefang 2.78 on 10.5.110.30 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-loop: dm-devel@redhat.com 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 Subject: [dm-devel] [PATCH v9 01/20] crypto: change transient busy return code to -EAGAIN X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Sun, 15 Oct 2017 09:25:16 +0000 (UTC) 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);