From patchwork Thu Nov 19 07:01:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zhang Qilong X-Patchwork-Id: 11916573 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=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 954BBC2D0E4 for ; Thu, 19 Nov 2020 06:58:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3718422242 for ; Thu, 19 Nov 2020 06:58:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725853AbgKSG5t (ORCPT ); Thu, 19 Nov 2020 01:57:49 -0500 Received: from szxga04-in.huawei.com ([45.249.212.190]:7653 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725648AbgKSG5t (ORCPT ); Thu, 19 Nov 2020 01:57:49 -0500 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.58]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4Cc9V25DwBz15Mtq for ; Thu, 19 Nov 2020 14:57:30 +0800 (CST) Received: from huawei.com (10.175.127.227) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.487.0; Thu, 19 Nov 2020 14:57:42 +0800 From: Zhang Qilong To: CC: Subject: [PATCH] Input: omap-keypad: Fix error goto and handling in omap4_keypad_probe Date: Thu, 19 Nov 2020 15:01:19 +0800 Message-ID: <20201119070119.4174387-1-zhangqilong3@huawei.com> X-Mailer: git-send-email 2.25.4 MIME-Version: 1.0 X-Originating-IP: [10.175.127.227] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org In omap4_keypad_probe, the patch fix several bugs. 1) pm_runtime_get_sync will increment pm usage counter even it failed. Forgetting to pm_runtime_put_noidle will result in reference leak. 2) In err_unmap, forget to disable runtime of device, pm_runtime_enable will increase power disable depth. Thus a pairing decrement is needed on the error handling path to keep it balanced. 3) In err_pm_disable, it will call pm_runtime_put_sync twice not one time. And we add the pm_runtime_put_noidle when pm_runtime_get_sync failed for 1). Move pm_runtime_disable to the err_unmap branch for 2). Move the input_register_device ahead for 3). Fixes: f77621cc640a7 ("Input: omap-keypad - dynamically handle register offsets") Fixes: 5ad567ffbaf20 ("Input: Input: omap4-keypad - wire up runtime PM handling") Signed-off-by: Zhang Qilong --- drivers/input/keyboard/omap4-keypad.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c index d6c924032aaa..17abc8434af5 100644 --- a/drivers/input/keyboard/omap4-keypad.c +++ b/drivers/input/keyboard/omap4-keypad.c @@ -277,6 +277,7 @@ static int omap4_keypad_probe(struct platform_device *pdev) pm_runtime_enable(&pdev->dev); error = pm_runtime_get_sync(&pdev->dev); if (error) { + pm_runtime_put_noidle(&pdev->dev); dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n"); goto err_unmap; } @@ -349,20 +350,19 @@ static int omap4_keypad_probe(struct platform_device *pdev) goto err_free_keymap; } - device_init_wakeup(&pdev->dev, true); - pm_runtime_put_sync(&pdev->dev); - error = input_register_device(keypad_data->input); if (error < 0) { dev_err(&pdev->dev, "failed to register input device\n"); - goto err_pm_disable; + goto err_free_irq; } + device_init_wakeup(&pdev->dev, true); + pm_runtime_put_sync(&pdev->dev); + platform_set_drvdata(pdev, keypad_data); return 0; -err_pm_disable: - pm_runtime_disable(&pdev->dev); +err_free_irq: free_irq(keypad_data->irq, keypad_data); err_free_keymap: kfree(keypad_data->keymap); @@ -371,6 +371,7 @@ static int omap4_keypad_probe(struct platform_device *pdev) err_pm_put_sync: pm_runtime_put_sync(&pdev->dev); err_unmap: + pm_runtime_disable(&pdev->dev); iounmap(keypad_data->base); err_release_mem: release_mem_region(res->start, resource_size(res));