From patchwork Wed May 5 09:42:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 12239603 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=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, 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 7E62CC2B9F2 for ; Wed, 5 May 2021 09:42:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 535BD61415 for ; Wed, 5 May 2021 09:42:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232834AbhEEJn2 (ORCPT ); Wed, 5 May 2021 05:43:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:48694 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232483AbhEEJnR (ORCPT ); Wed, 5 May 2021 05:43:17 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B8A4361582; Wed, 5 May 2021 09:42:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620207739; bh=+rTtVWoWq20JhxgxmIT+9kZE/lGmMC43nyN1Fh8TG7g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Mf9MOyq5thATWWFz9Hfbj8qgxuAvW3JlflD7XQ0cH5Zuor+EZfGkN4Clt6QuA/wuw y//8rOn0wy+PwGVwJR2l2zPRdRAbICxiV10Wht8HhYN9kDf5fwiiGAn5z5+dYRFycg hcs3nteUDogm5vKp4HJiP89KL9dsunC2XF1E+Wy/Yx0g7iHfrGfyqn8+fMGVt3jbap e5CeeWJz/kEw+yVPIXc444DK3B1iQAnTorL0d3P3Fcf0VUbnjuH6RvYudx2oVunGDL MiRntCkCTFvqR19/Zc6WvKZ8WwuoyEiSriT7RmDlXB+pCovVcwfinqKW+5jGx7TF05 whTs4hBFXexEQ== Received: by mail.kernel.org with local (Exim 4.94) (envelope-from ) id 1leE2r-00AHws-H9; Wed, 05 May 2021 11:42:17 +0200 From: Mauro Carvalho Chehab Cc: linuxarm@huawei.com, mauro.chehab@huawei.com, Mauro Carvalho Chehab , Fabien Dessenne , Mauro Carvalho Chehab , linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 22/25] media: sti/bdisp: fix pm_runtime_get_sync() usage count Date: Wed, 5 May 2021 11:42:12 +0200 Message-Id: X-Mailer: git-send-email 2.30.2 In-Reply-To: References: MIME-Version: 1.0 Sender: Mauro Carvalho Chehab To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org The pm_runtime_get_sync() internally increments the dev->power.usage_count without decrementing it, even on errors. The bdisp_start_streaming() doesn't take it into account, which would unbalance PM usage counter at bdisp_stop_streaming(). The logic at bdisp_probe() is correct, but the best is to use the same call along the driver. So, replace it by the new pm_runtime_resume_and_get(), introduced by: commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter") in order to properly decrement the usage counter, avoiding a potential PM usage counter leak. Signed-off-by: Mauro Carvalho Chehab Reviewed-by: Jonathan Cameron --- drivers/media/platform/sti/bdisp/bdisp-v4l2.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/media/platform/sti/bdisp/bdisp-v4l2.c b/drivers/media/platform/sti/bdisp/bdisp-v4l2.c index 060ca85f64d5..85288da9d2ae 100644 --- a/drivers/media/platform/sti/bdisp/bdisp-v4l2.c +++ b/drivers/media/platform/sti/bdisp/bdisp-v4l2.c @@ -499,7 +499,7 @@ static int bdisp_start_streaming(struct vb2_queue *q, unsigned int count) { struct bdisp_ctx *ctx = q->drv_priv; struct vb2_v4l2_buffer *buf; - int ret = pm_runtime_get_sync(ctx->bdisp_dev->dev); + int ret = pm_runtime_resume_and_get(ctx->bdisp_dev->dev); if (ret < 0) { dev_err(ctx->bdisp_dev->dev, "failed to set runtime PM\n"); @@ -1364,10 +1364,10 @@ static int bdisp_probe(struct platform_device *pdev) /* Power management */ pm_runtime_enable(dev); - ret = pm_runtime_get_sync(dev); + ret = pm_runtime_resume_and_get(dev); if (ret < 0) { dev_err(dev, "failed to set PM\n"); - goto err_pm; + goto err_remove; } /* Filters */ @@ -1395,6 +1395,7 @@ static int bdisp_probe(struct platform_device *pdev) bdisp_hw_free_filters(bdisp->dev); err_pm: pm_runtime_put(dev); +err_remove: bdisp_debugfs_remove(bdisp); v4l2_device_unregister(&bdisp->v4l2_dev); err_clk: