From patchwork Wed Apr 25 14:28:27 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sebastian Andrzej Siewior X-Patchwork-Id: 10363335 X-Patchwork-Delegate: rjw@sisk.pl Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 67B56601D3 for ; Wed, 25 Apr 2018 14:28:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 583BE28746 for ; Wed, 25 Apr 2018 14:28:40 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4C9412891E; Wed, 25 Apr 2018 14:28:40 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7FE9528746 for ; Wed, 25 Apr 2018 14:28:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753336AbeDYO2i convert rfc822-to-8bit (ORCPT ); Wed, 25 Apr 2018 10:28:38 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:40914 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753508AbeDYO2i (ORCPT ); Wed, 25 Apr 2018 10:28:38 -0400 Received: from localhost ([127.0.0.1] helo=bazinga.breakpoint.cc) by Galois.linutronix.de with esmtp (Exim 4.80) (envelope-from ) id 1fBLPN-0001Jr-24; Wed, 25 Apr 2018 16:28:33 +0200 From: Sebastian Andrzej Siewior To: "Rafael J. Wysocki" Cc: "Rafael J. Wysocki" , ACPI Devel Maling List , devel@acpica.org, Thomas Gleixner , Steven Rostedt , Robert Moore , Erik Schmauss , Clark Williams , John Kacur , Sebastian Andrzej Siewior Subject: [PATCH 2/2] ACPICA: Convert acpi_gbl_hardware lock back to an acpi_raw_spinlock Date: Wed, 25 Apr 2018 16:28:27 +0200 Message-Id: <20180425142827.22202-2-bigeasy@linutronix.de> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180425142827.22202-1-bigeasy@linutronix.de> References: <20180425102940.4j5fkdhn4t2o7sgc@linutronix.de> <20180425142827.22202-1-bigeasy@linutronix.de> MIME-Version: 1.0 Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Steven Rostedt We hit the following bug with -RT: |BUG: scheduling while atomic: swapper/7/0/0x00000002 |Pid: 0, comm: swapper/7 Not tainted 3.6.11-rt28.19.el6rt.x86_64.debug #1 |Call Trace: | rt_spin_lock+0x16/0x40 | __schedule_bug+0x67/0x90 | __schedule+0x793/0x7a0 | acpi_os_acquire_lock+0x1f/0x23 | acpi_write_bit_register+0x33/0xb0 | rt_spin_lock_slowlock+0xe5/0x2f0 | acpi_idle_enter_bm+0x8a/0x28e … As the acpi code disables interrupts in acpi_idle_enter_bm, and calls code that grabs the acpi lock, it causes issues as the lock is currently in RT a sleeping lock. The lock was converted from a raw to a sleeping lock due to some previous issues, and tests that showed it didn't seem to matter. Unfortunately, it did matter for one of our boxes. This patch converts the lock back to a raw lock. I've run this code on a few of my own machines, one being my laptop that uses the acpi quite extensively. I've been able to suspend and resume without issues. [ tglx: Made the change exclusive for acpi_gbl_hardware_lock ] Signed-off-by: Steven Rostedt Cc: John Kacur Cc: Clark Williams Link: http://lkml.kernel.org/r/1360765565.23152.5.camel@gandalf.local.home Signed-off-by: Thomas Gleixner [bigeasy: shorten the backtrace, use the type acpi_raw_spinlock incl. accessor] Signed-off-by: Sebastian Andrzej Siewior --- drivers/acpi/acpica/acglobal.h | 2 +- drivers/acpi/acpica/hwregs.c | 4 ++-- drivers/acpi/acpica/hwxface.c | 4 ++-- drivers/acpi/acpica/utmutex.c | 4 ++-- 4 files changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/acpi/acpica/acglobal.h b/drivers/acpi/acpica/acglobal.h index 0bc550072a21..1e6204518496 100644 --- a/drivers/acpi/acpica/acglobal.h +++ b/drivers/acpi/acpica/acglobal.h @@ -82,7 +82,7 @@ ACPI_GLOBAL(u8, acpi_gbl_global_lock_pending); * interrupt level */ ACPI_GLOBAL(acpi_spinlock, acpi_gbl_gpe_lock); /* For GPE data structs and registers */ -ACPI_GLOBAL(acpi_spinlock, acpi_gbl_hardware_lock); /* For ACPI H/W except GPE registers */ +ACPI_GLOBAL(acpi_raw_spinlock, acpi_gbl_hardware_lock); /* For ACPI H/W except GPE registers */ ACPI_GLOBAL(acpi_spinlock, acpi_gbl_reference_count_lock); /* Mutex for _OSI support */ diff --git a/drivers/acpi/acpica/hwregs.c b/drivers/acpi/acpica/hwregs.c index 27a86ad55b58..3de794bcf8fa 100644 --- a/drivers/acpi/acpica/hwregs.c +++ b/drivers/acpi/acpica/hwregs.c @@ -390,14 +390,14 @@ acpi_status acpi_hw_clear_acpi_status(void) ACPI_BITMASK_ALL_FIXED_STATUS, ACPI_FORMAT_UINT64(acpi_gbl_xpm1a_status.address))); - lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); + lock_flags = acpi_os_acquire_raw_lock(acpi_gbl_hardware_lock); /* Clear the fixed events in PM1 A/B */ status = acpi_hw_register_write(ACPI_REGISTER_PM1_STATUS, ACPI_BITMASK_ALL_FIXED_STATUS); - acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); + acpi_os_release_raw_lock(acpi_gbl_hardware_lock, lock_flags); if (ACPI_FAILURE(status)) { goto exit; diff --git a/drivers/acpi/acpica/hwxface.c b/drivers/acpi/acpica/hwxface.c index 5d1396870bd0..6e39a771a56e 100644 --- a/drivers/acpi/acpica/hwxface.c +++ b/drivers/acpi/acpica/hwxface.c @@ -227,7 +227,7 @@ acpi_status acpi_write_bit_register(u32 register_id, u32 value) return_ACPI_STATUS(AE_BAD_PARAMETER); } - lock_flags = acpi_os_acquire_lock(acpi_gbl_hardware_lock); + lock_flags = acpi_os_acquire_raw_lock(acpi_gbl_hardware_lock); /* * At this point, we know that the parent register is one of the @@ -288,7 +288,7 @@ acpi_status acpi_write_bit_register(u32 register_id, u32 value) unlock_and_exit: - acpi_os_release_lock(acpi_gbl_hardware_lock, lock_flags); + acpi_os_release_raw_lock(acpi_gbl_hardware_lock, lock_flags); return_ACPI_STATUS(status); } diff --git a/drivers/acpi/acpica/utmutex.c b/drivers/acpi/acpica/utmutex.c index d2d93e388f40..2e465e6a0ab6 100644 --- a/drivers/acpi/acpica/utmutex.c +++ b/drivers/acpi/acpica/utmutex.c @@ -52,7 +52,7 @@ acpi_status acpi_ut_mutex_initialize(void) return_ACPI_STATUS (status); } - status = acpi_os_create_lock (&acpi_gbl_hardware_lock); + status = acpi_os_create_raw_lock(&acpi_gbl_hardware_lock); if (ACPI_FAILURE (status)) { return_ACPI_STATUS (status); } @@ -109,7 +109,7 @@ void acpi_ut_mutex_terminate(void) /* Delete the spinlocks */ acpi_os_delete_lock(acpi_gbl_gpe_lock); - acpi_os_delete_lock(acpi_gbl_hardware_lock); + acpi_os_delete_raw_lock(acpi_gbl_hardware_lock); acpi_os_delete_lock(acpi_gbl_reference_count_lock); /* Delete the reader/writer lock */