From mboxrd@z Thu Jan 1 00:00:00 1970 From: Allan Stephens Subject: [PATCH 09/13 net-next-2.6] [TIPC]: Add missing spinlock in name table display code Date: Fri, 30 May 2008 14:20:44 -0400 Message-ID: <1212171648-27122-10-git-send-email-allan.stephens@windriver.com> References: <1212171648-27122-1-git-send-email-allan.stephens@windriver.com> Cc: netdev@vger.kernel.org, allan.stephens@windriver.com To: David Miller Return-path: Received: from mail.windriver.com ([147.11.1.11]:50549 "EHLO mail.wrs.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753163AbYE3SXL (ORCPT ); Fri, 30 May 2008 14:23:11 -0400 In-Reply-To: <1212171648-27122-1-git-send-email-allan.stephens@windriver.com> Sender: netdev-owner@vger.kernel.org List-ID: This patch ensures that the display code that traverses the publication lists belonging to a name table entry take its associated spinlock, to protect against a possible change to one of its "head of list" pointers caused by a simultaneous name table lookup operation by another thread of control. Signed-off-by: Allan Stephens --- net/tipc/name_table.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletions(-) diff --git a/net/tipc/name_table.c b/net/tipc/name_table.c index 4455f13..096f7bd 100644 --- a/net/tipc/name_table.c +++ b/net/tipc/name_table.c @@ -74,7 +74,7 @@ struct sub_seq { * @first_free: array index of first unused sub-sequence entry * @ns_list: links to adjacent name sequences in hash chain * @subscriptions: list of subscriptions for this 'type' - * @lock: spinlock controlling access to name sequence structure + * @lock: spinlock controlling access to publication lists of all sub-sequences */ struct name_seq { @@ -918,7 +918,9 @@ static void nameseq_list(struct name_seq *seq, struct print_buf *buf, u32 depth, for (sseq = seq->sseqs; sseq != &seq->sseqs[seq->first_free]; sseq++) { if ((lowbound <= sseq->upper) && (upbound >= sseq->lower)) { tipc_printf(buf, "%s ", typearea); + spin_lock_bh(&seq->lock); subseq_list(sseq, buf, depth, index); + spin_unlock_bh(&seq->lock); sprintf(typearea, "%10s", " "); } } -- 1.5.3.2