From patchwork Mon May 25 18:26:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= X-Patchwork-Id: 11569299 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6C35214F6 for ; Mon, 25 May 2020 18:26:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5FA0D2087D for ; Mon, 25 May 2020 18:26:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389311AbgEYS0R (ORCPT ); Mon, 25 May 2020 14:26:17 -0400 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 Received: by mail-ej1-f67.google.com with SMTP id z5so21375647ejb.3; Mon, 25 May 2020 11:26:13 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=tkUGbMkkypRL042+ieWSoDccuHFghwak5Hi3wVxhDmE=; b=C6FvFlWGYjOrdkQk8jI5gKJ0FH/UIZfAILSeyIMoTRLVytb2uadwYyVnBKtqhCSTxo aj7PGbUmhTcR+JDysusQTqgasRYDpRRQVxdYvRfjAv9VZB2QeepMKCxd5gfoeTRCiG/e Jmgh6y48CMevLk1MxULlpxQvOwdtAh0T6TWBfaG9cwVabEG8HXYWfG+8hlVFUiRJhf7c mtlCsuSP04spjmnUmGR4zpEhwRDaInkTdyS7yw8aXxmvRwo3qaUa74CaZKTiV/4cXz5v TEJMF4mWPLspYAssS60gMRqErYpLcUVYYto+4tR5wIWJ4CrG4vDDmSFwZy+Kdd+wz9mq Thig== X-Gm-Message-State: AOAM5325TrlWaByK3eWEBqeVkTpPT770+FJzp0atfEnrNtZYykD0dU5j Ga9qYIw6jsILnnvzjKMDVjGtN1EA6vzgYy46 X-Google-Smtp-Source: ABdhPJyLZsaw5mEGXRcLaNb9q3bD5AU4cxUKQ8Vo98mbYphbp21kYQ3Rc8jcjNp3ljuzgmIEt8D4Ug== X-Received: by 2002:a17:906:f1c3:: with SMTP id gx3mr19110160ejb.278.1590431172312; Mon, 25 May 2020 11:26:12 -0700 (PDT) Received: from workstation.lan ([95.155.85.46]) by smtp.gmail.com with ESMTPSA id n15sm15555707ejs.10.2020.05.25.11.26.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 May 2020 11:26:11 -0700 (PDT) From: =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= 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 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> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200525182608.1823735-1-kw@linux.com> References: <20200525182608.1823735-1-kw@linux.com> MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@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);