From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756201Ab2GXRBv (ORCPT ); Tue, 24 Jul 2012 13:01:51 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:40776 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755798Ab2GXRBt (ORCPT ); Tue, 24 Jul 2012 13:01:49 -0400 From: Ming Lei To: Linus Torvalds , Greg Kroah-Hartman Cc: "Rafael J. Wysocki" , Borislav Petkov , linux-kernel@vger.kernel.org, Ming Lei Subject: [RFC PATCH 13/13] driver core: firmware loader: cache devices firmware during suspend/resume cycle Date: Wed, 25 Jul 2012 01:00:13 +0800 Message-Id: <1343149213-10160-14-git-send-email-ming.lei@canonical.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1343149213-10160-1-git-send-email-ming.lei@canonical.com> References: <1343149213-10160-1-git-send-email-ming.lei@canonical.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch implements caching devices' firmware automatically during system syspend/resume cycle, so any device drivers can call request_firmware or request_firmware_nowait inside resume path to get the cached firmware if they have loaded firmwares successfully at least once before entering suspend. Signed-off-by: Ming Lei --- drivers/base/firmware_class.c | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 0918b26..59384e0 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "base.h" @@ -106,6 +107,8 @@ struct firmware_cache { wait_queue_head_t wait_queue; int cnt; struct delayed_work work; + + struct notifier_block pm_notify; }; struct firmware_buf { @@ -1202,6 +1205,31 @@ static void device_uncache_firmwares_delay(unsigned long delay) msecs_to_jiffies(delay)); } +#ifdef CONFIG_PM +static int fw_pm_notify(struct notifier_block *notify_block, + unsigned long mode, void *unused) +{ + switch (mode) { + case PM_HIBERNATION_PREPARE: + case PM_SUSPEND_PREPARE: + device_cache_firmwares(); + break; + + case PM_POST_SUSPEND: + case PM_POST_HIBERNATION: + case PM_POST_RESTORE: + device_uncache_firmwares_delay(10 * MSEC_PER_SEC); + break; + } + + return 0; +} +#else +static int fw_pm_notify(struct notifier_block *notify_block, + unsigned long mode, void *unused) +{} +#endif + static void __init fw_cache_init(void) { spin_lock_init(&fw_cache.lock); @@ -1214,6 +1242,9 @@ static void __init fw_cache_init(void) init_waitqueue_head(&fw_cache.wait_queue); INIT_DELAYED_WORK(&fw_cache.work, device_uncache_firmwares_work); + fw_cache.pm_notify.notifier_call = fw_pm_notify; + + register_pm_notifier(&fw_cache.pm_notify); } static int __init firmware_class_init(void) @@ -1224,6 +1255,7 @@ static int __init firmware_class_init(void) static void __exit firmware_class_exit(void) { + unregister_pm_notifier(&fw_cache.pm_notify); class_unregister(&firmware_class); } -- 1.7.9.5