From patchwork Thu Jul 14 18:23:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Garry X-Patchwork-Id: 591610 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA81FCCA47B for ; Thu, 14 Jul 2022 18:29:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240681AbiGNS3x (ORCPT ); Thu, 14 Jul 2022 14:29:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46292 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240674AbiGNS3v (ORCPT ); Thu, 14 Jul 2022 14:29:51 -0400 Received: from sinmsgout03.his.huawei.com (sinmsgout03.his.huawei.com [119.8.177.38]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 53B206A9F2; Thu, 14 Jul 2022 11:29:50 -0700 (PDT) Received: from fraeml734-chm.china.huawei.com (unknown [172.18.156.148]) by sinmsgout03.his.huawei.com (SkyGuard) with ESMTP id 4LkNKg6n9kz9v79V; Fri, 15 Jul 2022 02:28:39 +0800 (CST) Received: from lhreml724-chm.china.huawei.com (10.201.108.75) by fraeml734-chm.china.huawei.com (10.206.15.215) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Thu, 14 Jul 2022 20:29:44 +0200 Received: from localhost.localdomain (10.69.192.58) by lhreml724-chm.china.huawei.com (10.201.108.75) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Thu, 14 Jul 2022 19:29:41 +0100 From: John Garry To: , CC: , , , Xiang Chen , John Garry Subject: [PATCH 2/5] scsi: hisi_sas: Remove unnecessary variable to hold DMA map elements Date: Fri, 15 Jul 2022 02:23:19 +0800 Message-ID: <1657823002-139010-3-git-send-email-john.garry@huawei.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1657823002-139010-1-git-send-email-john.garry@huawei.com> References: <1657823002-139010-1-git-send-email-john.garry@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.69.192.58] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To lhreml724-chm.china.huawei.com (10.201.108.75) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Xiang Chen Use slot->n_elem to store the return value of dma_map_sg() for SSP and SMP IOs, and remove unnecessary variable n_elem_req. Signed-off-by: Xiang Chen Signed-off-by: John Garry --- drivers/scsi/hisi_sas/hisi_sas_main.c | 43 +++++++++++---------------- 1 file changed, 18 insertions(+), 25 deletions(-) diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index 764e859d0106..bd62e441f947 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -220,9 +220,10 @@ void hisi_sas_slot_task_free(struct hisi_hba *hisi_hba, struct sas_task *task, if (!sas_protocol_ata(task->task_proto)) { if (slot->n_elem) - dma_unmap_sg(dev, task->scatter, - task->num_scatter, - task->data_dir); + if (task->task_proto & SAS_PROTOCOL_SSP) + dma_unmap_sg(dev, task->scatter, + task->num_scatter, + task->data_dir); if (slot->n_elem_dif) { struct sas_ssp_task *ssp_task = &task->ssp_task; struct scsi_cmnd *scsi_cmnd = ssp_task->cmd; @@ -269,28 +270,23 @@ static void hisi_sas_task_prep_abort(struct hisi_hba *hisi_hba, } static void hisi_sas_dma_unmap(struct hisi_hba *hisi_hba, - struct sas_task *task, int n_elem, - int n_elem_req) + struct sas_task *task, int n_elem) { struct device *dev = hisi_hba->dev; - if (!sas_protocol_ata(task->task_proto)) { + if (!sas_protocol_ata(task->task_proto) && n_elem) { if (task->num_scatter) { - if (n_elem) - dma_unmap_sg(dev, task->scatter, - task->num_scatter, - task->data_dir); + dma_unmap_sg(dev, task->scatter, task->num_scatter, + task->data_dir); } else if (task->task_proto & SAS_PROTOCOL_SMP) { - if (n_elem_req) - dma_unmap_sg(dev, &task->smp_task.smp_req, - 1, DMA_TO_DEVICE); + dma_unmap_sg(dev, &task->smp_task.smp_req, + 1, DMA_TO_DEVICE); } } } static int hisi_sas_dma_map(struct hisi_hba *hisi_hba, - struct sas_task *task, int *n_elem, - int *n_elem_req) + struct sas_task *task, int *n_elem) { struct device *dev = hisi_hba->dev; int rc; @@ -308,9 +304,9 @@ static int hisi_sas_dma_map(struct hisi_hba *hisi_hba, goto prep_out; } } else if (task->task_proto & SAS_PROTOCOL_SMP) { - *n_elem_req = dma_map_sg(dev, &task->smp_task.smp_req, - 1, DMA_TO_DEVICE); - if (!*n_elem_req) { + *n_elem = dma_map_sg(dev, &task->smp_task.smp_req, + 1, DMA_TO_DEVICE); + if (!*n_elem) { rc = -ENOMEM; goto prep_out; } @@ -332,8 +328,7 @@ static int hisi_sas_dma_map(struct hisi_hba *hisi_hba, err_out_dma_unmap: /* It would be better to call dma_unmap_sg() here, but it's messy */ - hisi_sas_dma_unmap(hisi_hba, task, *n_elem, - *n_elem_req); + hisi_sas_dma_unmap(hisi_hba, task, *n_elem); prep_out: return rc; } @@ -457,7 +452,7 @@ void hisi_sas_task_deliver(struct hisi_hba *hisi_hba, static int hisi_sas_queue_command(struct sas_task *task, gfp_t gfp_flags) { - int n_elem = 0, n_elem_dif = 0, n_elem_req = 0; + int n_elem = 0, n_elem_dif = 0; struct domain_device *device = task->dev; struct asd_sas_port *sas_port = device->port; struct hisi_sas_device *sas_dev = device->lldd_dev; @@ -568,8 +563,7 @@ static int hisi_sas_queue_command(struct sas_task *task, gfp_t gfp_flags) return -EINVAL; } - rc = hisi_sas_dma_map(hisi_hba, task, &n_elem, - &n_elem_req); + rc = hisi_sas_dma_map(hisi_hba, task, &n_elem); if (rc < 0) goto prep_out; @@ -605,8 +599,7 @@ static int hisi_sas_queue_command(struct sas_task *task, gfp_t gfp_flags) if (!sas_protocol_ata(task->task_proto)) hisi_sas_dif_dma_unmap(hisi_hba, task, n_elem_dif); err_out_dma_unmap: - hisi_sas_dma_unmap(hisi_hba, task, n_elem, - n_elem_req); + hisi_sas_dma_unmap(hisi_hba, task, n_elem); prep_out: dev_err(dev, "task exec: failed[%d]!\n", rc); return rc;