From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ej1-f67.google.com ([209.85.218.67]:36124 "EHLO mail-ej1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387644AbgEYS0Q (ORCPT ); Mon, 25 May 2020 14:26:16 -0400 From: =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= Subject: [PATCH 1/8] driver core: Add helper for accessing Power Management callbacs Date: Mon, 25 May 2020 18:26:01 +0000 Message-Id: <20200525182608.1823735-2-kw@linux.com> In-Reply-To: <20200525182608.1823735-1-kw@linux.com> References: <20200525182608.1823735-1-kw@linux.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-s390-owner@vger.kernel.org List-ID: To: Dan Carpenter Cc: "Rafael J. Wysocki" , Len Brown , Kevin Hilman , Ulf Hansson , Pavel Machek , Greg Kroah-Hartman , Johan Hovold , Alex Elder , Bjorn Helgaas , "James E.J. Bottomley" , "Martin K. Petersen" , Felipe Balbi , Julian Wiedmann , Karsten Graul , Ursula Braun , Jakub Kicinski , Bjorn Andersson , John Stultz , "David S. Miller" , greybus-dev@lists.linaro.org, netdev@vger.kernel.org, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-usb@vger.kernel.org Add driver_to_pm() helper allowing for accessing the Power Management callbacs for a particular device. Access to the callbacs (struct dev_pm_ops) is normally done through using the pm pointer that is embedded within the device_driver struct. Helper allows for the code required to reference the pm pointer and access Power Management callbas to be simplified. Changing the following: struct device_driver *drv = dev->driver; if (dev->driver && dev->driver->pm && dev->driver->pm->prepare) { int ret = dev->driver->pm->prepare(dev); To: const struct dev_pm_ops *pm = driver_to_pm(dev->driver); if (pm && pm->prepare) { int ret = pm->prepare(dev); Or, changing the following: const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; To: const struct dev_pm_ops *pm = driver_to_pm(dev->driver); Signed-off-by: Krzysztof Wilczyński --- include/linux/device/driver.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/linux/device/driver.h b/include/linux/device/driver.h index ee7ba5b5417e..ccd0b315fd93 100644 --- a/include/linux/device/driver.h +++ b/include/linux/device/driver.h @@ -236,6 +236,21 @@ driver_find_device_by_acpi_dev(struct device_driver *drv, const void *adev) } #endif +/** + * driver_to_pm - Return Power Management callbacs (struct dev_pm_ops) for + * a particular device. + * @drv: Pointer to a device (struct device_driver) for which you want to access + * the Power Management callbacks. + * + * Returns a pointer to the struct dev_pm_ops embedded within the device (struct + * device_driver), or returns NULL if Power Management is not present and the + * pointer is not valid. + */ +static inline const struct dev_pm_ops *driver_to_pm(struct device_driver *drv) +{ + return drv && drv->pm ? drv->pm : NULL; +} + extern int driver_deferred_probe_timeout; void driver_deferred_probe_add(struct device *dev); int driver_deferred_probe_check_state(struct device *dev); -- 2.26.2