From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753443AbbF2Ova (ORCPT ); Mon, 29 Jun 2015 10:51:30 -0400 Received: from mailuogwhop.emc.com ([168.159.213.141]:58777 "EHLO mailuogwhop.emc.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752903AbbF2Ouk (ORCPT ); Mon, 29 Jun 2015 10:50:40 -0400 X-DKIM: OpenDKIM Filter v2.4.3 mailuogwprd01.lss.emc.com t5TEoTwl026704 X-DKIM: OpenDKIM Filter v2.4.3 mailuogwprd01.lss.emc.com t5TEoTwl026704 From: Allen Hubbe To: linux-ntb@googlegroups.com Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Jon Mason , Dave Jiang , Allen Hubbe Subject: [PATCH 5/9] NTB: Fix oops in debugfs when transport is half-up Date: Mon, 29 Jun 2015 10:50:01 -0400 Message-Id: X-Mailer: git-send-email 2.4.0.rc0.44.g244209c.dirty In-Reply-To: References: In-Reply-To: References: X-RSA-Classifications: public X-Sentrion-Hostname: mailuogwprd01.lss.emc.com Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dave Jiang When the remote side is not up, we do not have all the context for the transport, and that causes NULL ptr access. Have the debugfs reads check to see if transport is up before we make access. Signed-off-by: Dave Jiang --- drivers/ntb/ntb_transport.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c index 30d8b52421ec..1764bb2fd265 100644 --- a/drivers/ntb/ntb_transport.c +++ b/drivers/ntb/ntb_transport.c @@ -438,13 +438,17 @@ static ssize_t debugfs_read(struct file *filp, char __user *ubuf, size_t count, char *buf; ssize_t ret, out_offset, out_count; + qp = filp->private_data; + + if (!qp || !qp->link_is_up) + return 0; + out_count = 1000; buf = kmalloc(out_count, GFP_KERNEL); if (!buf) return -ENOMEM; - qp = filp->private_data; out_offset = 0; out_offset += snprintf(buf + out_offset, out_count - out_offset, "NTB QP stats\n"); -- 2.4.0.rc0.43.gcf8a8c6