From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752037AbdI1EbO (ORCPT ); Thu, 28 Sep 2017 00:31:14 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:7459 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751199AbdI1E3e (ORCPT ); Thu, 28 Sep 2017 00:29:34 -0400 From: "Wei Hu (Xavier)" To: CC: , , , , , , , , , , , Subject: [PATCH for-next 9/9] RDMA/hns: Replace usleep_range with udelay when checking command status Date: Thu, 28 Sep 2017 12:57:34 +0800 Message-ID: <1506574654-56699-10-git-send-email-xavier.huwei@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1506574654-56699-1-git-send-email-xavier.huwei@huawei.com> References: <1506574654-56699-1-git-send-email-xavier.huwei@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.71.200.31] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090204.59CC7AAB.007A,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 9cc6c9f859743780d4a13b7e0d3a7bb6 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lijun Ou It replaces usleep_range with udelay to avoid using usleep_range function in spin_lock_bh spin region, because it probably cause calltrace. BUG: scheduling while atomic: insmod/1428/0x00000002 Modules linked in: hns-roce-hw-v2(+) hns_roce rdma_ucm rdma_cm iw_cm ib_uverbs ib_cm ib_core CPU: 0 PID: 1428 Comm: insmod Not tainted 4.12.0-rc1-00677-g252e8fd-dirty #43 Hardware name: (null) (DT) Call trace: [] dump_backtrace+0x0/0x274 [] show_stack+0x20/0x28 [] dump_stack+0x94/0xb4 [] __schedule_bug+0x68/0x84 [] __schedule+0x5fc/0x70c [] schedule+0x40/0xa4 [] schedule_hrtimeout_range_clock+0x98/0xfc [] schedule_hrtimeout_range+0x34/0x40 [] usleep_range+0x6c/0x80 [] hns_roce_cmd_send+0xe4/0x264 [hns-roce-hw-v2] [] hns_roce_cmd_query_hw_info+0x40/0x60 [hns-roce-hw-v2] [] hns_roce_v2_profile+0x28/0x668 [hns-roce-hw-v2] [] hns_roce_init+0x6c/0x948 [hns-roce-hw-v2] Signed-off-by: Lijun Ou Signed-off-by: Wei Hu (Xavier) Signed-off-by: Shaobo Xu --- drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c index 90ef5c6..915d1d5 100644 --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c @@ -589,7 +589,7 @@ int hns_roce_cmq_send(struct hns_roce_dev *hr_dev, do { if (hns_roce_cmq_csq_done(hr_dev)) break; - usleep_range(1000, 2000); + udelay(1); timeout++; } while (timeout < priv->cmq.tx_timeout); } -- 1.9.1