From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752836AbeEUKOZ (ORCPT ); Mon, 21 May 2018 06:14:25 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:55756 "EHLO huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752257AbeEUKLl (ORCPT ); Mon, 21 May 2018 06:11:41 -0400 From: John Garry To: , CC: , , , Xiang Chen , "John Garry" Subject: [PATCH 03/13] scsi: hisi_sas: Change common allocation mode of device id Date: Mon, 21 May 2018 18:09:15 +0800 Message-ID: <1526897365-228549-4-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1526897365-228549-1-git-send-email-john.garry@huawei.com> References: <1526897365-228549-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.67.212.75] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xiang Chen To reduce possibility of hitting unknown SoC bugs and aid debugging and test, change allocation mode of device id from last used device id instead of lowest available index. Signed-off-by: Xiang Chen Signed-off-by: John Garry --- drivers/scsi/hisi_sas/hisi_sas.h | 1 + drivers/scsi/hisi_sas/hisi_sas_main.c | 6 +++++- 2 files changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/hisi_sas/hisi_sas.h b/drivers/scsi/hisi_sas/hisi_sas.h index 3c88400..b4717bd 100644 --- a/drivers/scsi/hisi_sas/hisi_sas.h +++ b/drivers/scsi/hisi_sas/hisi_sas.h @@ -275,6 +275,7 @@ struct hisi_hba { int slot_index_count; int last_slot_index; + int last_dev_id; unsigned long *slot_index_tags; unsigned long reject_stp_links_msk; diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index 1d300a2..04a3eb4 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -596,10 +596,12 @@ static struct hisi_sas_device *hisi_sas_alloc_dev(struct domain_device *device) struct hisi_hba *hisi_hba = dev_to_hisi_hba(device); struct hisi_sas_device *sas_dev = NULL; unsigned long flags; + int last = hisi_hba->last_dev_id; + int first = (hisi_hba->last_dev_id + 1) % HISI_SAS_MAX_DEVICES; int i; spin_lock_irqsave(&hisi_hba->lock, flags); - for (i = 0; i < HISI_SAS_MAX_DEVICES; i++) { + for (i = first; i != last; i %= HISI_SAS_MAX_DEVICES) { if (hisi_hba->devices[i].dev_type == SAS_PHY_UNUSED) { int queue = i % hisi_hba->queue_count; struct hisi_sas_dq *dq = &hisi_hba->dq[queue]; @@ -614,7 +616,9 @@ static struct hisi_sas_device *hisi_sas_alloc_dev(struct domain_device *device) INIT_LIST_HEAD(&hisi_hba->devices[i].list); break; } + i++; } + hisi_hba->last_dev_id = i; spin_unlock_irqrestore(&hisi_hba->lock, flags); return sas_dev; -- 1.9.1