From patchwork Mon Jul 15 14:37:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joel Fernandes X-Patchwork-Id: 11044375 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 058546C5 for ; Mon, 15 Jul 2019 14:38:40 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E854D205FC for ; Mon, 15 Jul 2019 14:38:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DADAC21BED; Mon, 15 Jul 2019 14:38:39 +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=-5.3 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id 131DF205FC for ; Mon, 15 Jul 2019 14:38:38 +0000 (UTC) Received: (qmail 32250 invoked by uid 550); 15 Jul 2019 14:37:59 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 32159 invoked from network); 15 Jul 2019 14:37:58 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=joelfernandes.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=5zPd11qsqBV6enPH1pgmEhMrw3DVmEsKL+rgelJGu5E=; b=XStDr0pOpAvfMPGvyaCiXhax5OpTI8omiicJPCmLonS9L7hbMWB8WbkqauDTlsAue1 /IzXyBhFpxdPHPkwfVRCjLPZYScMK7RsrUnJmmgQGxgyicRfMpFtWxfw1YpluI/oDB0w mhjDfrjf8F43ROWC4kjFdePNxqWjxG9UE7yCo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=5zPd11qsqBV6enPH1pgmEhMrw3DVmEsKL+rgelJGu5E=; b=nZmAvERD55LW92cZjr1I4vCOoTq3MTWOC0sl1GZtV7dosoiMmYGxaX+GyDP4OX4LjZ bhNZkBS0kwsZHdYseOM0o8Sag25oD7Y5eWi1qyWfpaiwaCQX+V/IUwwZRaYBOpb5YfDM aCjMzI42S9Ki15FVw3p02vyQ9UuYuuDEOZDfJSZ93+/4z15/1qRTW7oaj75+cj1+UKNc Oulsal4ZpQXCvNtQLWJpT9SQi4KUzGd9+knjai2tUOPsEAin11WFNXwDf/y1agpZjTxH mi6RIRbQpNyX+fxu3KLSdurt59sEAxXfC6qQ++2Mw2gzH0GiDCAhg+FhD/DU4caaNMM6 arsg== X-Gm-Message-State: APjAAAVYccunDiuP048pHykZV4P7PD67snYTJYkPPAfTvNF/epMSCgTL d2Rn6z9L0Wdq/gFrziY5A2o= X-Google-Smtp-Source: APXvYqzkIpFv5vPuz81gmhFr3B+gCTSP4FKDqSNzw1vK/5n3JtNPasCMdlzt1VHFYex1IyUvrWl66Q== X-Received: by 2002:a17:902:2889:: with SMTP id f9mr27373830plb.230.1563201466638; Mon, 15 Jul 2019 07:37:46 -0700 (PDT) From: "Joel Fernandes (Google)" To: linux-kernel@vger.kernel.org Cc: "Joel Fernandes (Google)" , Alexey Kuznetsov , Bjorn Helgaas , Borislav Petkov , c0d1n61at3@gmail.com, "David S. Miller" , edumazet@google.com, Greg Kroah-Hartman , Hideaki YOSHIFUJI , "H. Peter Anvin" , Ingo Molnar , Jonathan Corbet , Josh Triplett , keescook@chromium.org, kernel-hardening@lists.openwall.com, kernel-team@android.com, Lai Jiangshan , Len Brown , linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-pci@vger.kernel.org, linux-pm@vger.kernel.org, Mathieu Desnoyers , neilb@suse.com, netdev@vger.kernel.org, Oleg Nesterov , "Paul E. McKenney" , Pavel Machek , peterz@infradead.org, "Rafael J. Wysocki" , Rasmus Villemoes , rcu@vger.kernel.org, Steven Rostedt , Tejun Heo , Thomas Gleixner , will@kernel.org, x86@kernel.org (maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)) Subject: [PATCH 8/9] acpi: Use built-in RCU list checking for acpi_ioremaps list (v1) Date: Mon, 15 Jul 2019 10:37:04 -0400 Message-Id: <20190715143705.117908-9-joel@joelfernandes.org> X-Mailer: git-send-email 2.22.0.510.g264f2c817a-goog In-Reply-To: <20190715143705.117908-1-joel@joelfernandes.org> References: <20190715143705.117908-1-joel@joelfernandes.org> MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP list_for_each_entry_rcu has built-in RCU and lock checking. Make use of it for acpi_ioremaps list traversal. Signed-off-by: Joel Fernandes (Google) Acked-by: Rafael J. Wysocki --- drivers/acpi/osl.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index 9c0edf2fc0dd..2f9d0d20b836 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -14,6 +14,7 @@ #include #include #include +#include #include #include #include @@ -80,6 +81,7 @@ struct acpi_ioremap { static LIST_HEAD(acpi_ioremaps); static DEFINE_MUTEX(acpi_ioremap_lock); +#define acpi_ioremap_lock_held() lock_is_held(&acpi_ioremap_lock.dep_map) static void __init acpi_request_region (struct acpi_generic_address *gas, unsigned int length, char *desc) @@ -206,7 +208,7 @@ acpi_map_lookup(acpi_physical_address phys, acpi_size size) { struct acpi_ioremap *map; - list_for_each_entry_rcu(map, &acpi_ioremaps, list) + list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held()) if (map->phys <= phys && phys + size <= map->phys + map->size) return map; @@ -249,7 +251,7 @@ acpi_map_lookup_virt(void __iomem *virt, acpi_size size) { struct acpi_ioremap *map; - list_for_each_entry_rcu(map, &acpi_ioremaps, list) + list_for_each_entry_rcu(map, &acpi_ioremaps, list, acpi_ioremap_lock_held()) if (map->virt <= virt && virt + size <= map->virt + map->size) return map;