From patchwork Sat Feb 13 11:58:44 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Vaittinen, Matti" X-Patchwork-Id: 12086669 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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 3F26FC433E6 for ; Sat, 13 Feb 2021 12:00:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 04B5164E46 for ; Sat, 13 Feb 2021 12:00:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229731AbhBML7p (ORCPT ); Sat, 13 Feb 2021 06:59:45 -0500 Received: from mail-lj1-f181.google.com ([209.85.208.181]:41921 "EHLO mail-lj1-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229706AbhBML7g (ORCPT ); Sat, 13 Feb 2021 06:59:36 -0500 Received: by mail-lj1-f181.google.com with SMTP id e17so2145556ljl.8; Sat, 13 Feb 2021 03:59:19 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=Og3EKyxPUKMGfzz8yqu0JBwP+v96RpWUBQsEZbrHD+8=; b=inRjugq8dZYlJ6CKvLuFRZuygDwWgg/eI1qK0UtvZC5aXeTHWXAZnh4CmXIvaUpdET RZbmyLvO2Jgjrc8l/m7pxQ6AQfapVpdoTDVR72Z3a3f2BFyr5+VCS57NzbTlVjVIKga6 PWwfLi6Ytk0GX9K3QgfsxOUXNqecAQaYp8Ri+Z0dNzn9zCQd5KJ9+TTG7fZ973FNzx6k d/hPzIS96BCawHPV9lkFNxvvqKXl7tnRfA12eivyl0Zn56uwyCHdacF0JNqDawGw395+ X3reRIZlP3l4ffScErusYdied3SeyAqU1qQEBxYPIsBUMPKUkViW4qjtO8v51+ZvPj2l vIHg== X-Gm-Message-State: AOAM5311BlORlGJ4wtfdqkHqgDcrgZjlZFL437zEnwtxdQcCWfr5k3Je sarltkWfCO+KaWsm9Jx+z1g= X-Google-Smtp-Source: ABdhPJxj3xe2a6po48BGrT8aKajunBGOzOMxU/3dhpzzTPYFHT/e8seZG86Yo2/QJ4xnTqfESId53w== X-Received: by 2002:a2e:7a18:: with SMTP id v24mr4030132ljc.55.1613217533531; Sat, 13 Feb 2021 03:58:53 -0800 (PST) Received: from localhost.localdomain (dc7vkhyyyyyyyyyyyyycy-3.rev.dnainternet.fi. [2001:14ba:16e2:8300::4]) by smtp.gmail.com with ESMTPSA id v72sm1838780lfa.77.2021.02.13.03.58.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 13 Feb 2021 03:58:52 -0800 (PST) Date: Sat, 13 Feb 2021 13:58:44 +0200 From: Matti Vaittinen To: mazziesaccount@gmail.com, matti.vaittinen@fi.rohmeurope.com Cc: Greg Kroah-Hartman , "Rafael J. Wysocki" , MyungJoo Ham , Chanwoo Choi , Andy Gross , Bjorn Andersson , Jean Delvare , Guenter Roeck , Hans de Goede , Mark Gross , Sebastian Reichel , Chen-Yu Tsai , Liam Girdwood , Mark Brown , Wim Van Sebroeck , Saravana Kannan , Heikki Krogerus , Andy Shevchenko , Joerg Roedel , Dan Williams , Bartosz Golaszewski , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-hwmon@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-pm@vger.kernel.org, linux-watchdog@vger.kernel.org Subject: [RFC PATCH 1/7] drivers: base: Add resource managed version of delayed work init Message-ID: <1230b0d2ba99ad546d72ab079e76cb1b3df32afb.1613216412.git.matti.vaittinen@fi.rohmeurope.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org A few drivers which need a delayed work-queue must cancel work at exit. Some of those implement remove solely for this purpose. Help drivers to avoid unnecessary remove and error-branch implementation by adding managed verision of delayed work initialization Signed-off-by: Matti Vaittinen --- drivers/base/devres.c | 33 +++++++++++++++++++++++++++++++++ include/linux/device.h | 5 +++++ 2 files changed, 38 insertions(+) diff --git a/drivers/base/devres.c b/drivers/base/devres.c index fb9d5289a620..2879595bb5a4 100644 --- a/drivers/base/devres.c +++ b/drivers/base/devres.c @@ -1231,3 +1231,36 @@ void devm_free_percpu(struct device *dev, void __percpu *pdata) (void *)pdata)); } EXPORT_SYMBOL_GPL(devm_free_percpu); + +static void dev_delayed_work_drop(struct device *dev, void *res) +{ + cancel_delayed_work_sync(*(struct delayed_work **)res); +} + +/** + * devm_delayed_work_autocancel - Resource-managed work allocation + * @dev: Device which lifetime work is bound to + * @pdata: work to be cancelled when device exits + * + * Initialize work which is automatically cancelled when device exits. + * A few drivers need delayed work which must be cancelled before driver + * is unload to avoid accessing removed resources. + * devm_delayed_work_autocancel() can be used to omit the explicit + * cancelleation when driver is unload. + */ +int devm_delayed_work_autocancel(struct device *dev, struct delayed_work *w, + void (*worker)(struct work_struct *work)) +{ + struct delayed_work **ptr; + + ptr = devres_alloc(dev_delayed_work_drop, sizeof(*ptr), GFP_KERNEL); + if (!ptr) + return -ENOMEM; + + INIT_DELAYED_WORK(w, worker); + *ptr = w; + devres_add(dev, ptr); + + return 0; +} +EXPORT_SYMBOL_GPL(devm_delayed_work_autocancel); diff --git a/include/linux/device.h b/include/linux/device.h index 1779f90eeb4c..192456198de7 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include @@ -249,6 +250,10 @@ void __iomem *devm_of_iomap(struct device *dev, struct device_node *node, int index, resource_size_t *size); +/* delayed work which is cancelled when driver exits */ +int devm_delayed_work_autocancel(struct device *dev, struct delayed_work *w, + void (*worker)(struct work_struct *work)); + /* allows to add/remove a custom action to devres stack */ int devm_add_action(struct device *dev, void (*action)(void *), void *data); void devm_remove_action(struct device *dev, void (*action)(void *), void *data);