From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stanislav Kinsbursky Subject: [PATCH] SUNRPC: skip dead but not buried clients on PipeFS events Date: Thu, 19 Apr 2012 14:57:18 +0400 Message-ID: <20120419105707.32131.79719.stgit@localhost6.localdomain6> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: linux-nfs@vger.kernel.org, xemul@parallels.com, neilb@suse.de, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, jbottomley@parallels.com, bfields@fieldses.org, davem@davemloft.net, devel@openvz.org To: Trond.Myklebust@netapp.com Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org These clients can't be safely dereferenced if their counter in 0. Signee-off-by: Stanislav Kinsbursky Signed-off-by: Stanislav Kinsbursky --- net/sunrpc/clnt.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 6797246..591994d 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -218,7 +218,8 @@ static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event) if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) || ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry)) continue; - atomic_inc(&clnt->cl_count); + if (atomic_inc_return(&clnt->cl_count) == 1) + continue; spin_unlock(&sn->rpc_client_lock); return clnt; }