From patchwork Thu May 6 15:05:45 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: 432508 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=-14.0 required=3.0 tests=BAYES_00, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS 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 51B81C433B4 for ; Thu, 6 May 2021 15:08:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 297C7613E3 for ; Thu, 6 May 2021 15:08:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234993AbhEFPJc (ORCPT ); Thu, 6 May 2021 11:09:32 -0400 Received: from www.linuxtv.org ([130.149.80.248]:59678 "EHLO www.linuxtv.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234888AbhEFPJc (ORCPT ); Thu, 6 May 2021 11:09:32 -0400 Received: from mchehab by www.linuxtv.org with local (Exim 4.92) (envelope-from ) id 1lefc4-007Gll-33; Thu, 06 May 2021 15:08:28 +0000 From: Mauro Carvalho Chehab Date: Thu, 06 May 2021 15:05:45 +0000 Subject: [git:media_stage/master] media: i2c: ccs-core: fix pm_runtime_get_sync() usage count To: linuxtv-commits@linuxtv.org Cc: Sakari Ailus , stable@vger.kernel.org Mail-followup-to: linux-media@vger.kernel.org Forward-to: linux-media@vger.kernel.org Reply-to: linux-media@vger.kernel.org Message-Id: Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org This is an automatic generated email to let you know that the following patch were queued: Subject: media: i2c: ccs-core: fix pm_runtime_get_sync() usage count Author: Mauro Carvalho Chehab Date: Fri Apr 23 17:19:11 2021 +0200 The pm_runtime_get_sync() internally increments the dev->power.usage_count without decrementing it, even on errors. There is a bug at ccs_pm_get_init(): when this function returns an error, the stream is not started, and RPM usage_count should not be incremented. However, if the calls to v4l2_ctrl_handler_setup() return errors, it will be kept incremented. At ccs_suspend() the best is to 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 automatically, in the case of errors. Fixes: 96e3a6b92f23 ("media: smiapp: Avoid maintaining power state information") Cc: stable@vger.kernel.org Acked-by: Sakari Ailus Signed-off-by: Mauro Carvalho Chehab drivers/media/i2c/ccs/ccs-core.c | 32 ++++++++++++++++++++++---------- 1 file changed, 22 insertions(+), 10 deletions(-) diff --git a/drivers/media/i2c/ccs/ccs-core.c b/drivers/media/i2c/ccs/ccs-core.c index b05f409014b2..4a848ac2d2cd 100644 --- a/drivers/media/i2c/ccs/ccs-core.c +++ b/drivers/media/i2c/ccs/ccs-core.c @@ -1880,21 +1880,33 @@ static int ccs_pm_get_init(struct ccs_sensor *sensor) struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd); int rval; + /* + * It can't use pm_runtime_resume_and_get() here, as the driver + * relies at the returned value to detect if the device was already + * active or not. + */ rval = pm_runtime_get_sync(&client->dev); - if (rval < 0) { - pm_runtime_put_noidle(&client->dev); + if (rval < 0) + goto error; - return rval; - } else if (!rval) { - rval = v4l2_ctrl_handler_setup(&sensor->pixel_array-> - ctrl_handler); - if (rval) - return rval; + /* Device was already active, so don't set controls */ + if (rval == 1) + return 0; - return v4l2_ctrl_handler_setup(&sensor->src->ctrl_handler); - } + /* Restore V4L2 controls to the previously suspended device */ + rval = v4l2_ctrl_handler_setup(&sensor->pixel_array->ctrl_handler); + if (rval) + goto error; + rval = v4l2_ctrl_handler_setup(&sensor->src->ctrl_handler); + if (rval) + goto error; + + /* Keep PM runtime usage_count incremented on success */ return 0; +error: + pm_runtime_put(&client->dev); + return rval; } static int ccs_set_stream(struct v4l2_subdev *subdev, int enable)