From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933540Ab2HQBqW (ORCPT ); Thu, 16 Aug 2012 21:46:22 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:61239 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932345Ab2HQBqS (ORCPT ); Thu, 16 Aug 2012 21:46:18 -0400 From: Ming Lei To: Linus Torvalds , Greg Kroah-Hartman Cc: "Rafael J. Wysocki" , Borislav Petkov , linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Ming Lei Subject: [RFC PATCH 2/3] PM / Sleep: introduce dpm_for_each_dev Date: Fri, 17 Aug 2012 09:45:48 +0800 Message-Id: <1345167949-7419-3-git-send-email-ming.lei@canonical.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1345167949-7419-1-git-send-email-ming.lei@canonical.com> References: <1345167949-7419-1-git-send-email-ming.lei@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org dpm_list and its pm lock provide a good way to iterate all devices in system. Except this way, there is no other easy way to iterate devices in system. firmware loader need to cache firmware images for devices before system sleep, so introduce the function to meet its demand. Reported-by: Fengguang Wu Signed-off-by: Ming Lei --- drivers/base/power/main.c | 19 +++++++++++++++++++ include/linux/pm.h | 5 +++++ 2 files changed, 24 insertions(+) diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c index 57f5814..184bcb5 100644 --- a/drivers/base/power/main.c +++ b/drivers/base/power/main.c @@ -1349,3 +1349,22 @@ int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) return async_error; } EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); + +/** + * dpm_for_each_dev - device iterator. + * @data: data for the callback. + * @fn: function to be called for each device. + * + * Iterate over devices in dpm_list, and call @fn for each device, + * passing it @data. + */ +void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) +{ + struct device *dev; + + device_pm_lock(); + list_for_each_entry(dev, &dpm_list, power.entry) + fn(dev, data); + device_pm_unlock(); +} +EXPORT_SYMBOL_GPL(dpm_for_each_dev); diff --git a/include/linux/pm.h b/include/linux/pm.h index 44d1f23..bf86f89 100644 --- a/include/linux/pm.h +++ b/include/linux/pm.h @@ -640,6 +640,7 @@ extern void __suspend_report_result(const char *function, void *fn, int ret); } while (0) extern int device_pm_wait_for_dev(struct device *sub, struct device *dev); +extern void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)); extern int pm_generic_prepare(struct device *dev); extern int pm_generic_suspend_late(struct device *dev); @@ -679,6 +680,10 @@ static inline int device_pm_wait_for_dev(struct device *a, struct device *b) return 0; } +void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) +{ +} + #define pm_generic_prepare NULL #define pm_generic_suspend NULL #define pm_generic_resume NULL -- 1.7.9.5