From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757428AbaEITdF (ORCPT ); Fri, 9 May 2014 15:33:05 -0400 Received: from mail-qa0-f54.google.com ([209.85.216.54]:42595 "EHLO mail-qa0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757362AbaEITdA (ORCPT ); Fri, 9 May 2014 15:33:00 -0400 From: Tejun Heo To: lizefan@huawei.com Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Tejun Heo Subject: [PATCH 2/7] cgroup: cgroup_idr_lock should be bh Date: Fri, 9 May 2014 15:32:50 -0400 Message-Id: <1399663975-315-3-git-send-email-tj@kernel.org> X-Mailer: git-send-email 1.9.0 In-Reply-To: <1399663975-315-1-git-send-email-tj@kernel.org> References: <1399663975-315-1-git-send-email-tj@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org cgroup_idr_remove() can be invoked from bh leading to lockdep detecting possible AA deadlock (IN_BH/ON_BH). Make the lock bh-safe. Signed-off-by: Tejun Heo --- kernel/cgroup.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 95fc66b..e2ff925 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -203,9 +203,9 @@ static int cgroup_idr_alloc(struct idr *idr, void *ptr, int start, int end, int ret; idr_preload(gfp_mask); - spin_lock(&cgroup_idr_lock); + spin_lock_bh(&cgroup_idr_lock); ret = idr_alloc(idr, ptr, start, end, gfp_mask); - spin_unlock(&cgroup_idr_lock); + spin_unlock_bh(&cgroup_idr_lock); idr_preload_end(); return ret; } @@ -214,17 +214,17 @@ static void *cgroup_idr_replace(struct idr *idr, void *ptr, int id) { void *ret; - spin_lock(&cgroup_idr_lock); + spin_lock_bh(&cgroup_idr_lock); ret = idr_replace(idr, ptr, id); - spin_unlock(&cgroup_idr_lock); + spin_unlock_bh(&cgroup_idr_lock); return ret; } static void cgroup_idr_remove(struct idr *idr, int id) { - spin_lock(&cgroup_idr_lock); + spin_lock_bh(&cgroup_idr_lock); idr_remove(idr, id); - spin_unlock(&cgroup_idr_lock); + spin_unlock_bh(&cgroup_idr_lock); } /** -- 1.9.0