From patchwork Mon Jan 24 23:28:51 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rafael Wysocki X-Patchwork-Id: 503311 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.3) with ESMTP id p0ONX7WI021467 for ; Mon, 24 Jan 2011 23:33:07 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753205Ab1AXXdF (ORCPT ); Mon, 24 Jan 2011 18:33:05 -0500 Received: from ogre.sisk.pl ([217.79.144.158]:35666 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752776Ab1AXXdE (ORCPT ); Mon, 24 Jan 2011 18:33:04 -0500 Received: from localhost (localhost.localdomain [127.0.0.1]) by ogre.sisk.pl (Postfix) with ESMTP id 2485D1A3174; Tue, 25 Jan 2011 00:35:47 +0100 (CET) Received: from ogre.sisk.pl ([127.0.0.1]) by localhost (ogre.sisk.pl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 08214-03; Tue, 25 Jan 2011 00:35:10 +0100 (CET) Received: from ferrari.rjw.lan (220-bem-13.acn.waw.pl [82.210.184.220]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ogre.sisk.pl (Postfix) with ESMTP id 4C71A1A3229; Tue, 25 Jan 2011 00:35:09 +0100 (CET) From: "Rafael J. Wysocki" To: Len Brown Subject: [PATCH 4/8] ACPI: Avoid walking the list of memory mappings in osl.c twice in a row Date: Tue, 25 Jan 2011 00:28:51 +0100 User-Agent: KMail/1.13.5 (Linux/2.6.38-rc1+; KDE/4.4.4; x86_64; ; ) Cc: Jeff Chua , LKML , ACPI Devel Maling List , "Linux-pm mailing list" , Matthew Garrett References: <201101201226.41021.rjw@sisk.pl> <201101250025.10817.rjw@sisk.pl> In-Reply-To: <201101250025.10817.rjw@sisk.pl> MIME-Version: 1.0 Message-Id: <201101250028.52136.rjw@sisk.pl> X-Virus-Scanned: amavisd-new at ogre.sisk.pl using MkS_Vir for Linux Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Mon, 24 Jan 2011 23:33:07 +0000 (UTC) Index: linux-2.6/drivers/acpi/osl.c =================================================================== --- linux-2.6.orig/drivers/acpi/osl.c +++ linux-2.6/drivers/acpi/osl.c @@ -358,6 +358,13 @@ static void acpi_kref_del_iomap(struct k list_del_rcu(&map->list); } +static void acpi_os_remove_map(struct acpi_ioremap *map) +{ + synchronize_rcu(); + iounmap(map->virt); + kfree(map); +} + void __ref acpi_os_unmap_memory(void __iomem *virt, acpi_size size) { struct acpi_ioremap *map; @@ -372,20 +379,14 @@ void __ref acpi_os_unmap_memory(void __i map = acpi_map_lookup_virt(virt, size); if (!map) { mutex_unlock(&acpi_ioremap_lock); - printk(KERN_ERR PREFIX "%s: bad address %p\n", __func__, virt); - dump_stack(); + WARN(true, PREFIX "%s: bad address %p\n", __func__, virt); return; } - del = kref_put(&map->ref, acpi_kref_del_iomap); mutex_unlock(&acpi_ioremap_lock); - if (!del) - return; - - synchronize_rcu(); - iounmap(map->virt); - kfree(map); + if (del) + acpi_os_remove_map(map); } EXPORT_SYMBOL_GPL(acpi_os_unmap_memory); @@ -414,8 +415,8 @@ static int acpi_os_map_generic_address(s static void acpi_os_unmap_generic_address(struct acpi_generic_address *addr) { - void __iomem *virt; - acpi_size size = addr->bit_width / 8; + struct acpi_ioremap *map; + int del; if (addr->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY) return; @@ -424,10 +425,16 @@ static void acpi_os_unmap_generic_addres return; mutex_lock(&acpi_ioremap_lock); - virt = acpi_map_vaddr_lookup(addr->address, size); + map = acpi_map_lookup(addr->address, addr->bit_width / 8); + if (!map) { + mutex_unlock(&acpi_ioremap_lock); + return; + } + del = kref_put(&map->ref, acpi_kref_del_iomap); mutex_unlock(&acpi_ioremap_lock); - acpi_os_unmap_memory(virt, size); + if (del) + acpi_os_remove_map(map); } #ifdef ACPI_FUTURE_USAGE