From patchwork Sun Aug 11 02:47:49 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yinghai Lu X-Patchwork-Id: 266282 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id E32212C00D0 for ; Sun, 11 Aug 2013 12:48:54 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752770Ab3HKCsi (ORCPT ); Sat, 10 Aug 2013 22:48:38 -0400 Received: from aserp1040.oracle.com ([141.146.126.69]:34715 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751956Ab3HKCsf (ORCPT ); Sat, 10 Aug 2013 22:48:35 -0400 Received: from acsinet21.oracle.com (acsinet21.oracle.com [141.146.126.237]) by aserp1040.oracle.com (Sentrion-MTA-4.3.1/Sentrion-MTA-4.3.1) with ESMTP id r7B2mFw1015630 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Sun, 11 Aug 2013 02:48:16 GMT Received: from aserz7021.oracle.com (aserz7021.oracle.com [141.146.126.230]) by acsinet21.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id r7B2mFmG001375 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sun, 11 Aug 2013 02:48:15 GMT Received: from abhmt117.oracle.com (abhmt117.oracle.com [141.146.116.69]) by aserz7021.oracle.com (8.14.4+Sun/8.14.4) with ESMTP id r7B2mFF6001370; Sun, 11 Aug 2013 02:48:15 GMT Received: from linux-siqj.site.site (/75.36.254.102) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Sat, 10 Aug 2013 19:48:14 -0700 From: Yinghai Lu To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Tony Luck , Bjorn Helgaas , "Rafael J. Wysocki" Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, Yinghai Lu Subject: [PATCH v4 03/28] genirq: Do not free unallocated irq descriptors Date: Sat, 10 Aug 2013 19:47:49 -0700 Message-Id: <1376189294-32022-4-git-send-email-yinghai@kernel.org> X-Mailer: git-send-email 1.8.1.4 In-Reply-To: <1376189294-32022-1-git-send-email-yinghai@kernel.org> References: <1376189294-32022-1-git-send-email-yinghai@kernel.org> X-Source-IP: acsinet21.oracle.com [141.146.126.237] Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Hot-added interrupt controllers can reserve a range of interrupt numbers, but only allocate some of them. To simplify the release on hot-remove allow them to iterate over the reserved range, let the free_desc() code return early when the descriptor does not exist -v2: changelog from tglx Signed-off-by: Yinghai Lu --- kernel/irq/irqdesc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c index 1166545..bbf0601 100644 --- a/kernel/irq/irqdesc.c +++ b/kernel/irq/irqdesc.c @@ -165,6 +165,9 @@ static void free_desc(unsigned int irq) { struct irq_desc *desc = irq_to_desc(irq); + if (!desc) + return; + unregister_irq_proc(irq, desc); mutex_lock(&sparse_irq_lock);