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=-9.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 EED07C388F7 for ; Mon, 9 Nov 2020 13:26:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 92221206ED for ; Mon, 9 Nov 2020 13:26:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604928416; bh=W5IgeIx3Jf/YRZvTtGpprJ0NmG+awwEypcUFt7nTa8Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=V48tm8kIdeny1SE42ZO2X0nmNw8zAI5X74x1VzV9o7PafDEUSka8wAK+f3zs1JfBA i8xmG7CT6OBaL8ekZ6gc+risuPZxVSMZC9fD7DPkAdFU57qkr+FHIPFN+cJ210FIO0 kWWisk9OLOBWTtLXfj4l+0UZlcoL0xwJhP8m/Zi4= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732884AbgKINPW (ORCPT ); Mon, 9 Nov 2020 08:15:22 -0500 Received: from mail.kernel.org ([198.145.29.99]:41996 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732868AbgKINPP (ORCPT ); Mon, 9 Nov 2020 08:15:15 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D00F62083B; Mon, 9 Nov 2020 13:15:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604927714; bh=W5IgeIx3Jf/YRZvTtGpprJ0NmG+awwEypcUFt7nTa8Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Eww1/HDxzjSpiuOZ1aTGKc4SMcRMl2YHATS4hDUIKztK4+ucH2j7XewKIJsPBD4sT wNm6ber9qHZ0HF1GDcxoqHy8Og5+4qj/0bPj2e5Zlq5rW64s37VglR+NFrlV5fqJRO dNuIDTOIXoyLgG0XPxyOzhWgBlx0zcdwNxFEltQo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Rafael J. Wysocki" , Xiang Chen Subject: [PATCH 5.4 82/85] PM: runtime: Resume the device earlier in __device_release_driver() Date: Mon, 9 Nov 2020 13:56:19 +0100 Message-Id: <20201109125026.519215147@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201109125022.614792961@linuxfoundation.org> References: <20201109125022.614792961@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rafael J. Wysocki commit 9226c504e364158a17a68ff1fe9d67d266922f50 upstream. Since the device is resumed from runtime-suspend in __device_release_driver() anyway, it is better to do that before looking for busy managed device links from it to consumers, because if there are any, device_links_unbind_consumers() will be called and it will cause the consumer devices' drivers to unbind, so the consumer devices will be runtime-resumed. In turn, resuming each consumer device will cause the supplier to be resumed and when the runtime PM references from the given consumer to it are dropped, it may be suspended. Then, the runtime-resume of the next consumer will cause the supplier to resume again and so on. Update the code accordingly. Signed-off-by: Rafael J. Wysocki Fixes: 9ed9895370ae ("driver core: Functional dependencies tracking support") Cc: All applicable # All applicable Tested-by: Xiang Chen Reviewed-by: Greg Kroah-Hartman Signed-off-by: Greg Kroah-Hartman --- drivers/base/dd.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -1105,6 +1105,8 @@ static void __device_release_driver(stru drv = dev->driver; if (drv) { + pm_runtime_get_sync(dev); + while (device_links_busy(dev)) { __device_driver_unlock(dev, parent); @@ -1116,12 +1118,12 @@ static void __device_release_driver(stru * have released the driver successfully while this one * was waiting, so check for that. */ - if (dev->driver != drv) + if (dev->driver != drv) { + pm_runtime_put(dev); return; + } } - pm_runtime_get_sync(dev); - driver_sysfs_remove(dev); if (dev->bus)