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[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-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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); -- 2.25.4 -- Matti Vaittinen, Linux device drivers ROHM Semiconductors, Finland SWDC Kiviharjunlenkki 1E 90220 OULU FINLAND ~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~ Simon says - in Latin please. ~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~ Thanks to Simon Glass for the translation =]