From patchwork Thu May 5 21:54:16 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 758312 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter2.kernel.org (8.14.4/8.14.3) with ESMTP id p45Lt0LD021922 for ; Thu, 5 May 2011 21:55:00 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753335Ab1EEVyt (ORCPT ); Thu, 5 May 2011 17:54:49 -0400 Received: from kroah.org ([198.145.64.141]:48542 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753537Ab1EEVyp (ORCPT ); Thu, 5 May 2011 17:54:45 -0400 Received: from localhost (c-76-121-69-168.hsd1.wa.comcast.net [76.121.69.168]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by coco.kroah.org (Postfix) with ESMTPSA id 0D1B64891B; Thu, 5 May 2011 14:54:45 -0700 (PDT) Subject: Patch "mmc: fix all hangs related to mmc/sd card insert/removal during suspend/resume" has been added to the 2.6.32-longterm tree To: maximlevitsky@gmail.com, akpm@linux-foundation.org, david-b@pacbell.net, gregkh@suse.de, linux-mmc@vger.kernel.org, stern@rowland.harvard.edu, torvalds@linux-foundation.org Cc: , From: Date: Thu, 05 May 2011 14:54:16 -0700 Message-ID: <13046324562530@kroah.org> MIME-Version: 1.0 Sender: linux-mmc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mmc@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter2.kernel.org [140.211.167.43]); Thu, 05 May 2011 21:55:00 +0000 (UTC) This is a note to let you know that I've just added the patch titled mmc: fix all hangs related to mmc/sd card insert/removal during suspend/resume to the 2.6.32-longterm tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/longterm/longterm-queue-2.6.32.git;a=summary The filename of the patch is: mmc-fix-all-hangs-related-to-mmc-sd-card-insert-remo.patch and it can be found in the queue-2.6.32 subdirectory. If you, or anyone else, feels it should not be added to the 2.6.32 longterm tree, please let know about it. From 849d6563ac4395a9890e6a1d10573c79237d4e8f Mon Sep 17 00:00:00 2001 From: Maxim Levitsky Date: Tue, 10 Aug 2010 18:01:41 -0700 Subject: mmc: fix all hangs related to mmc/sd card insert/removal during suspend/resume From: Maxim Levitsky commit 4c2ef25fe0b847d2ae818f74758ddb0be1c27d8e upstream. If you don't use CONFIG_MMC_UNSAFE_RESUME, as soon as you attempt to suspend, the card will be removed, therefore this patch doesn't change the behavior of this option. However the removal will be done by pm notifier, which runs while userspace is still not frozen and thus can freely use del_gendisk, without the risk of deadlock which would happen otherwise. Card detect workqueue is now disabled while userspace is frozen, Therefore if you do use CONFIG_MMC_UNSAFE_RESUME, and remove the card during suspend, the removal will be detected as soon as userspace is unfrozen, again at the moment it is safe to call del_gendisk. Tested with and without CONFIG_MMC_UNSAFE_RESUME with suspend and hibernate. [akpm@linux-foundation.org: clean up function prototype] [akpm@linux-foundation.org: fix CONFIG_PM-n linkage, small cleanups] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Maxim Levitsky Cc: David Brownell Cc: Alan Stern Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds [bwh: Adjust for 2.6.32] Signed-off-by: Greg Kroah-Hartman --- drivers/mmc/core/core.c | 81 ++++++++++++++++++++++++++++++++--------------- drivers/mmc/core/host.c | 4 ++ include/linux/mmc/host.h | 3 + 3 files changed, 63 insertions(+), 25 deletions(-) Patches currently in longterm-queue-2.6.32 which might be from maximlevitsky@gmail.com are /home/gregkh/linux/longterm/longterm-queue-2.6.32/queue-2.6.32/mmc-build-fix-mmc_pm_notify-is-only-available-with-c.patch /home/gregkh/linux/longterm/longterm-queue-2.6.32/queue-2.6.32/mmc-fix-all-hangs-related-to-mmc-sd-card-insert-remo.patch -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1041,6 +1041,17 @@ void mmc_rescan(struct work_struct *work container_of(work, struct mmc_host, detect.work); u32 ocr; int err; + unsigned long flags; + + spin_lock_irqsave(&host->lock, flags); + + if (host->rescan_disable) { + spin_unlock_irqrestore(&host->lock, flags); + return; + } + + spin_unlock_irqrestore(&host->lock, flags); + mmc_bus_get(host); @@ -1247,18 +1258,6 @@ int mmc_suspend_host(struct mmc_host *ho if (host->bus_ops && !host->bus_dead) { if (host->bus_ops->suspend) err = host->bus_ops->suspend(host); - if (err == -ENOSYS || !host->bus_ops->resume) { - /* - * We simply "remove" the card in this case. - * It will be redetected on resume. - */ - if (host->bus_ops->remove) - host->bus_ops->remove(host); - mmc_claim_host(host); - mmc_detach_bus(host); - mmc_release_host(host); - err = 0; - } } mmc_bus_put(host); @@ -1288,28 +1287,60 @@ int mmc_resume_host(struct mmc_host *hos printk(KERN_WARNING "%s: error %d during resume " "(card was removed?)\n", mmc_hostname(host), err); - if (host->bus_ops->remove) - host->bus_ops->remove(host); - mmc_claim_host(host); - mmc_detach_bus(host); - mmc_release_host(host); - /* no need to bother upper layers */ err = 0; } } mmc_bus_put(host); - /* - * We add a slight delay here so that resume can progress - * in parallel. - */ - mmc_detect_change(host, 1); - return err; } - EXPORT_SYMBOL(mmc_resume_host); +/* Do the card removal on suspend if card is assumed removeable + * Do that in pm notifier while userspace isn't yet frozen, so we will be able + to sync the card. +*/ +int mmc_pm_notify(struct notifier_block *notify_block, + unsigned long mode, void *unused) +{ + struct mmc_host *host = container_of( + notify_block, struct mmc_host, pm_notify); + unsigned long flags; + + + switch (mode) { + case PM_HIBERNATION_PREPARE: + case PM_SUSPEND_PREPARE: + + spin_lock_irqsave(&host->lock, flags); + host->rescan_disable = 1; + spin_unlock_irqrestore(&host->lock, flags); + cancel_delayed_work_sync(&host->detect); + + if (!host->bus_ops || host->bus_ops->suspend) + break; + + mmc_claim_host(host); + + if (host->bus_ops->remove) + host->bus_ops->remove(host); + + mmc_detach_bus(host); + mmc_release_host(host); + break; + + case PM_POST_SUSPEND: + case PM_POST_HIBERNATION: + + spin_lock_irqsave(&host->lock, flags); + host->rescan_disable = 0; + spin_unlock_irqrestore(&host->lock, flags); + mmc_detect_change(host, 0); + + } + + return 0; +} #endif static int __init mmc_init(void) --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -16,6 +16,7 @@ #include #include #include +#include #include @@ -84,6 +85,7 @@ struct mmc_host *mmc_alloc_host(int extr init_waitqueue_head(&host->wq); INIT_DELAYED_WORK(&host->detect, mmc_rescan); INIT_DELAYED_WORK_DEFERRABLE(&host->disable, mmc_host_deeper_disable); + host->pm_notify.notifier_call = mmc_pm_notify; /* * By default, hosts do not support SGIO or large requests. @@ -132,6 +134,7 @@ int mmc_add_host(struct mmc_host *host) #endif mmc_start_host(host); + register_pm_notifier(&host->pm_notify); return 0; } @@ -148,6 +151,7 @@ EXPORT_SYMBOL(mmc_add_host); */ void mmc_remove_host(struct mmc_host *host) { + unregister_pm_notifier(&host->pm_notify); mmc_stop_host(host); #ifdef CONFIG_DEBUG_FS --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -120,6 +120,7 @@ struct mmc_host { unsigned int f_min; unsigned int f_max; u32 ocr_avail; + struct notifier_block pm_notify; #define MMC_VDD_165_195 0x00000080 /* VDD voltage 1.65 - 1.95 */ #define MMC_VDD_20_21 0x00000100 /* VDD voltage 2.0 ~ 2.1 */ @@ -177,6 +178,7 @@ struct mmc_host { /* Only used with MMC_CAP_DISABLE */ int enabled; /* host is enabled */ + int rescan_disable; /* disable card detection */ int nesting_cnt; /* "enable" nesting count */ int en_dis_recurs; /* detect recursion */ unsigned int disable_delay; /* disable delay in msecs */ @@ -249,6 +251,7 @@ int mmc_card_can_sleep(struct mmc_host * int mmc_host_enable(struct mmc_host *host); int mmc_host_disable(struct mmc_host *host); int mmc_host_lazy_disable(struct mmc_host *host); +int mmc_pm_notify(struct notifier_block *notify_block, unsigned long, void *); static inline void mmc_set_disable_delay(struct mmc_host *host, unsigned int disable_delay)