From patchwork Thu Jan 16 10:14:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gilad Ben-Yossef X-Patchwork-Id: 11336453 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D6C0F13BD for ; Thu, 16 Jan 2020 10:15:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B4A3C207E0 for ; Thu, 16 Jan 2020 10:15:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731712AbgAPKPY (ORCPT ); Thu, 16 Jan 2020 05:15:24 -0500 Received: from foss.arm.com ([217.140.110.172]:47512 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726832AbgAPKPY (ORCPT ); Thu, 16 Jan 2020 05:15:24 -0500 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6781A139F; Thu, 16 Jan 2020 02:15:23 -0800 (PST) Received: from e110176-lin.arm.com (unknown [10.50.4.173]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D903D3F534; Thu, 16 Jan 2020 02:15:21 -0800 (PST) From: Gilad Ben-Yossef To: Herbert Xu , "David S. Miller" Cc: Ofir Drang , Hadar Gat , stable@kernel.org, linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 08/11] crypto: ccree - fix PM race condition Date: Thu, 16 Jan 2020 12:14:43 +0200 Message-Id: <20200116101447.20374-9-gilad@benyossef.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20200116101447.20374-1-gilad@benyossef.com> References: <20200116101447.20374-1-gilad@benyossef.com> MIME-Version: 1.0 Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org The PM code was racy, possibly causing the driver to submit requests to a powered down device. Fix the race and while at it simplify the PM code. Signed-off-by: Gilad Ben-Yossef Fixes: 1358c13a48c4 ("crypto: ccree - fix resume race condition on init") Cc: stable@kernel.org # v4.20 --- drivers/crypto/ccree/cc_driver.h | 1 + drivers/crypto/ccree/cc_pm.c | 28 ++++----------- drivers/crypto/ccree/cc_request_mgr.c | 50 --------------------------- drivers/crypto/ccree/cc_request_mgr.h | 8 ----- 4 files changed, 7 insertions(+), 80 deletions(-) diff --git a/drivers/crypto/ccree/cc_driver.h b/drivers/crypto/ccree/cc_driver.h index 7b6b5d6f1b33..9d77cfdb10d9 100644 --- a/drivers/crypto/ccree/cc_driver.h +++ b/drivers/crypto/ccree/cc_driver.h @@ -160,6 +160,7 @@ struct cc_drvdata { int std_bodies; bool sec_disabled; u32 comp_mask; + bool pm_on; }; struct cc_crypto_alg { diff --git a/drivers/crypto/ccree/cc_pm.c b/drivers/crypto/ccree/cc_pm.c index 79c612144310..ee9e9cba2fbb 100644 --- a/drivers/crypto/ccree/cc_pm.c +++ b/drivers/crypto/ccree/cc_pm.c @@ -22,14 +22,8 @@ const struct dev_pm_ops ccree_pm = { int cc_pm_suspend(struct device *dev) { struct cc_drvdata *drvdata = dev_get_drvdata(dev); - int rc; dev_dbg(dev, "set HOST_POWER_DOWN_EN\n"); - rc = cc_suspend_req_queue(drvdata); - if (rc) { - dev_err(dev, "cc_suspend_req_queue (%x)\n", rc); - return rc; - } fini_cc_regs(drvdata); cc_iowrite(drvdata, CC_REG(HOST_POWER_DOWN_EN), POWER_DOWN_ENABLE); cc_clk_off(drvdata); @@ -63,13 +57,6 @@ int cc_pm_resume(struct device *dev) /* check if tee fips error occurred during power down */ cc_tee_handle_fips_error(drvdata); - rc = cc_resume_req_queue(drvdata); - if (rc) { - dev_err(dev, "cc_resume_req_queue (%x)\n", rc); - return rc; - } - - /* must be after the queue resuming as it uses the HW queue*/ cc_init_hash_sram(drvdata); return 0; @@ -80,10 +67,8 @@ int cc_pm_get(struct device *dev) int rc = 0; struct cc_drvdata *drvdata = dev_get_drvdata(dev); - if (cc_req_queue_suspended(drvdata)) + if (drvdata->pm_on) rc = pm_runtime_get_sync(dev); - else - pm_runtime_get_noresume(dev); return (rc == 1 ? 0 : rc); } @@ -93,14 +78,11 @@ int cc_pm_put_suspend(struct device *dev) int rc = 0; struct cc_drvdata *drvdata = dev_get_drvdata(dev); - if (!cc_req_queue_suspended(drvdata)) { + if (drvdata->pm_on) { pm_runtime_mark_last_busy(dev); rc = pm_runtime_put_autosuspend(dev); - } else { - /* Something wrong happens*/ - dev_err(dev, "request to suspend already suspended queue"); - rc = -EBUSY; } + return rc; } @@ -117,7 +99,7 @@ int cc_pm_init(struct cc_drvdata *drvdata) /* must be before the enabling to avoid redundant suspending */ pm_runtime_set_autosuspend_delay(dev, CC_SUSPEND_TIMEOUT); pm_runtime_use_autosuspend(dev); - /* activate the PM module */ + /* set us as active - note we won't do PM ops until cc_pm_go()! */ return pm_runtime_set_active(dev); } @@ -125,9 +107,11 @@ int cc_pm_init(struct cc_drvdata *drvdata) void cc_pm_go(struct cc_drvdata *drvdata) { pm_runtime_enable(drvdata_to_dev(drvdata)); + drvdata->pm_on = true; } void cc_pm_fini(struct cc_drvdata *drvdata) { pm_runtime_disable(drvdata_to_dev(drvdata)); + drvdata->pm_on = false; } diff --git a/drivers/crypto/ccree/cc_request_mgr.c b/drivers/crypto/ccree/cc_request_mgr.c index ce09c430c8b9..9d61e6f12478 100644 --- a/drivers/crypto/ccree/cc_request_mgr.c +++ b/drivers/crypto/ccree/cc_request_mgr.c @@ -41,7 +41,6 @@ struct cc_req_mgr_handle { #else struct tasklet_struct comptask; #endif - bool is_runtime_suspended; }; struct cc_bl_item { @@ -664,52 +663,3 @@ static void comp_handler(unsigned long devarg) cc_proc_backlog(drvdata); dev_dbg(dev, "Comp. handler done.\n"); } - -/* - * resume the queue configuration - no need to take the lock as this happens - * inside the spin lock protection - */ -#if defined(CONFIG_PM) -int cc_resume_req_queue(struct cc_drvdata *drvdata) -{ - struct cc_req_mgr_handle *request_mgr_handle = - drvdata->request_mgr_handle; - - spin_lock_bh(&request_mgr_handle->hw_lock); - request_mgr_handle->is_runtime_suspended = false; - spin_unlock_bh(&request_mgr_handle->hw_lock); - - return 0; -} - -/* - * suspend the queue configuration. Since it is used for the runtime suspend - * only verify that the queue can be suspended. - */ -int cc_suspend_req_queue(struct cc_drvdata *drvdata) -{ - struct cc_req_mgr_handle *request_mgr_handle = - drvdata->request_mgr_handle; - - /* lock the send_request */ - spin_lock_bh(&request_mgr_handle->hw_lock); - if (request_mgr_handle->req_queue_head != - request_mgr_handle->req_queue_tail) { - spin_unlock_bh(&request_mgr_handle->hw_lock); - return -EBUSY; - } - request_mgr_handle->is_runtime_suspended = true; - spin_unlock_bh(&request_mgr_handle->hw_lock); - - return 0; -} - -bool cc_req_queue_suspended(struct cc_drvdata *drvdata) -{ - struct cc_req_mgr_handle *request_mgr_handle = - drvdata->request_mgr_handle; - - return request_mgr_handle->is_runtime_suspended; -} - -#endif diff --git a/drivers/crypto/ccree/cc_request_mgr.h b/drivers/crypto/ccree/cc_request_mgr.h index f46cf766fe4d..ff7746aaaf35 100644 --- a/drivers/crypto/ccree/cc_request_mgr.h +++ b/drivers/crypto/ccree/cc_request_mgr.h @@ -40,12 +40,4 @@ void complete_request(struct cc_drvdata *drvdata); void cc_req_mgr_fini(struct cc_drvdata *drvdata); -#if defined(CONFIG_PM) -int cc_resume_req_queue(struct cc_drvdata *drvdata); - -int cc_suspend_req_queue(struct cc_drvdata *drvdata); - -bool cc_req_queue_suspended(struct cc_drvdata *drvdata); -#endif - #endif /*__REQUEST_MGR_H__*/