From mboxrd@z Thu Jan 1 00:00:00 1970 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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 C8133C433E1 for ; Mon, 8 Jun 2020 23:11:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AD19220890 for ; Mon, 8 Jun 2020 23:11:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591657861; bh=7McYIa9P3Rh28JO6FRRv8eTfuuEGvhSv6QQoypGjkZ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=vMmsJsSaFGBIeKEjCwY2qMS+QEGEjKEPzeQ0ojyG6ygv4lMqwlWVcD0iMTcpOiOgZ 54LArtJtjwhcBaHMcTp4ao+x6hb7cVlNXc4eUqwOGIbEYnbeeWV5tH9rarfnHUWB53 JmpuadRHIEFLovoNJ/zOCoGy3mrLmMt2LV3SCcro= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728805AbgFHXLA (ORCPT ); Mon, 8 Jun 2020 19:11:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:57524 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728798AbgFHXK7 (ORCPT ); Mon, 8 Jun 2020 19:10:59 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7260F20E65; Mon, 8 Jun 2020 23:10:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1591657859; bh=7McYIa9P3Rh28JO6FRRv8eTfuuEGvhSv6QQoypGjkZ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=h5g3+OahlaK5paaudlsHuxazMgq2TiVbGAYLOZQhDW2PCsYSgfcECIY3WGPdfQKXc 0cFswUmyNjZNUm9PKleh0Au9atEKhaXffcdeuvtIX/rfmlAaRsZmpTktuakqt97cFO Zun57MrGo6auY9G/yRRbEWtHoSVwCuIFosxUzwiY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Nicolas Toromanoff , Herbert Xu , Sasha Levin , linux-crypto@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 5.7 222/274] crypto: stm32/crc32 - fix multi-instance Date: Mon, 8 Jun 2020 19:05:15 -0400 Message-Id: <20200608230607.3361041-222-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200608230607.3361041-1-sashal@kernel.org> References: <20200608230607.3361041-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Nicolas Toromanoff [ Upstream commit 10b89c43a64eb0d236903b79a3bc9d8f6cbfd9c7 ] Ensure CRC algorithm is registered only once in crypto framework when there are several instances of CRC devices. Update the CRC device list management to avoid that only the first CRC instance is used. Fixes: b51dbe90912a ("crypto: stm32 - Support for STM32 CRC32 crypto module") Signed-off-by: Nicolas Toromanoff Signed-off-by: Herbert Xu Signed-off-by: Sasha Levin --- drivers/crypto/stm32/stm32-crc32.c | 48 ++++++++++++++++++++++-------- 1 file changed, 36 insertions(+), 12 deletions(-) diff --git a/drivers/crypto/stm32/stm32-crc32.c b/drivers/crypto/stm32/stm32-crc32.c index 1c3e411b7acb..10304511f9b4 100644 --- a/drivers/crypto/stm32/stm32-crc32.c +++ b/drivers/crypto/stm32/stm32-crc32.c @@ -91,16 +91,29 @@ static int stm32_crc_setkey(struct crypto_shash *tfm, const u8 *key, return 0; } -static int stm32_crc_init(struct shash_desc *desc) +static struct stm32_crc *stm32_crc_get_next_crc(void) { - struct stm32_crc_desc_ctx *ctx = shash_desc_ctx(desc); - struct stm32_crc_ctx *mctx = crypto_shash_ctx(desc->tfm); struct stm32_crc *crc; spin_lock_bh(&crc_list.lock); crc = list_first_entry(&crc_list.dev_list, struct stm32_crc, list); + if (crc) + list_move_tail(&crc->list, &crc_list.dev_list); spin_unlock_bh(&crc_list.lock); + return crc; +} + +static int stm32_crc_init(struct shash_desc *desc) +{ + struct stm32_crc_desc_ctx *ctx = shash_desc_ctx(desc); + struct stm32_crc_ctx *mctx = crypto_shash_ctx(desc->tfm); + struct stm32_crc *crc; + + crc = stm32_crc_get_next_crc(); + if (!crc) + return -ENODEV; + pm_runtime_get_sync(crc->dev); /* Reset, set key, poly and configure in bit reverse mode */ @@ -125,9 +138,9 @@ static int stm32_crc_update(struct shash_desc *desc, const u8 *d8, struct stm32_crc_ctx *mctx = crypto_shash_ctx(desc->tfm); struct stm32_crc *crc; - spin_lock_bh(&crc_list.lock); - crc = list_first_entry(&crc_list.dev_list, struct stm32_crc, list); - spin_unlock_bh(&crc_list.lock); + crc = stm32_crc_get_next_crc(); + if (!crc) + return -ENODEV; pm_runtime_get_sync(crc->dev); @@ -200,6 +213,8 @@ static int stm32_crc_digest(struct shash_desc *desc, const u8 *data, return stm32_crc_init(desc) ?: stm32_crc_finup(desc, data, length, out); } +static unsigned int refcnt; +static DEFINE_MUTEX(refcnt_lock); static struct shash_alg algs[] = { /* CRC-32 */ { @@ -290,12 +305,18 @@ static int stm32_crc_probe(struct platform_device *pdev) list_add(&crc->list, &crc_list.dev_list); spin_unlock(&crc_list.lock); - ret = crypto_register_shashes(algs, ARRAY_SIZE(algs)); - if (ret) { - dev_err(dev, "Failed to register\n"); - clk_disable_unprepare(crc->clk); - return ret; + mutex_lock(&refcnt_lock); + if (!refcnt) { + ret = crypto_register_shashes(algs, ARRAY_SIZE(algs)); + if (ret) { + mutex_unlock(&refcnt_lock); + dev_err(dev, "Failed to register\n"); + clk_disable_unprepare(crc->clk); + return ret; + } } + refcnt++; + mutex_unlock(&refcnt_lock); dev_info(dev, "Initialized\n"); @@ -316,7 +337,10 @@ static int stm32_crc_remove(struct platform_device *pdev) list_del(&crc->list); spin_unlock(&crc_list.lock); - crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); + mutex_lock(&refcnt_lock); + if (!--refcnt) + crypto_unregister_shashes(algs, ARRAY_SIZE(algs)); + mutex_unlock(&refcnt_lock); pm_runtime_disable(crc->dev); pm_runtime_put_noidle(crc->dev); -- 2.25.1