From patchwork Fri Nov 27 09:44:46 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: 'Qinglang Miao X-Patchwork-Id: 333966 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=-16.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT 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 588CFC64E7B for ; Fri, 27 Nov 2020 09:41:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 18B8C21527 for ; Fri, 27 Nov 2020 09:41:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728727AbgK0Jkl (ORCPT ); Fri, 27 Nov 2020 04:40:41 -0500 Received: from szxga06-in.huawei.com ([45.249.212.32]:7999 "EHLO szxga06-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728493AbgK0Jkj (ORCPT ); Fri, 27 Nov 2020 04:40:39 -0500 Received: from DGGEMS412-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4Cj8kD2DQTzhjF1; Fri, 27 Nov 2020 17:40:20 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS412-HUB.china.huawei.com (10.3.19.212) with Microsoft SMTP Server id 14.3.487.0; Fri, 27 Nov 2020 17:40:30 +0800 From: Qinglang Miao To: =?utf-8?q?=C5=81ukasz_Stelmach?= , "Krzysztof Kozlowski" CC: , , , , Qinglang Miao Subject: [PATCH] hwrng: exynos - fix reference leak in exynos_trng_probe Date: Fri, 27 Nov 2020 17:44:46 +0800 Message-ID: <20201127094446.121277-1-miaoqinglang@huawei.com> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org pm_runtime_get_sync will increment pm usage counter even it failed. Forgetting to putting operation will result in a reference leak here. A new function pm_runtime_resume_and_get is introduced in [0] to keep usage counter balanced. So We fix the reference leak by replacing it with new funtion. [0] dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter") Fixes: 6cd225cc5d8a ("hwrng: exynos - add Samsung Exynos True RNG driver") Reported-by: Hulk Robot Signed-off-by: Qinglang Miao --- drivers/char/hw_random/exynos-trng.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/char/hw_random/exynos-trng.c b/drivers/char/hw_random/exynos-trng.c index 8e1fe3f8d..666246bc8 100644 --- a/drivers/char/hw_random/exynos-trng.c +++ b/drivers/char/hw_random/exynos-trng.c @@ -132,7 +132,7 @@ static int exynos_trng_probe(struct platform_device *pdev) return PTR_ERR(trng->mem); pm_runtime_enable(&pdev->dev); - ret = pm_runtime_get_sync(&pdev->dev); + ret = pm_runtime_resume_and_get(&pdev->dev); if (ret < 0) { dev_err(&pdev->dev, "Could not get runtime PM.\n"); goto err_pm_get;