From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5C996C43466 for ; Mon, 21 Sep 2020 16:34:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1CD3B239D3 for ; Mon, 21 Sep 2020 16:34:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600706091; bh=BBbo8/ziU6asjVcbtlPGEKdIIiwmfsiKuMsFgA9S9mg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=AOEBQDxTies/TtUwpQ3SGxnPGsqJ1IUiX10ysv0NwdVduX+05xo/++w+eTkP0mEEu hgNRwb+31akqHd1OOfAlz2z0v2LYxuLNUXMoLmwI48fw5hpuHFxyZBuGIqDLHtib1G rYe0fXIK/KRFncRWdcyilLXlYpdM+eTH9/FX0rZI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728052AbgIUQet (ORCPT ); Mon, 21 Sep 2020 12:34:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:33258 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728769AbgIUQed (ORCPT ); Mon, 21 Sep 2020 12:34:33 -0400 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D33A5239D0; Mon, 21 Sep 2020 16:34:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1600706072; bh=BBbo8/ziU6asjVcbtlPGEKdIIiwmfsiKuMsFgA9S9mg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oxQLA1ZXKIQS5EJ5n82/pc4sf6V7lkJmiQB4sJooW7z5yLVgwymAXhxfiHox9U/ev nG8mXD1HybGQMBK7gqz4kj3aQ9gcJtXVQ2ECa6YsYtg0CbzNFztEUVm/0djRvt2j2X NJKmjqC5QNHl19IigjcT9fonXNydfaxcnLuj2qG0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, John Garry , Jason Yan , Luo Jiaxing , "Martin K. Petersen" , Sasha Levin Subject: [PATCH 4.9 04/70] scsi: libsas: Set data_dir as DMA_NONE if libata marks qc as NODATA Date: Mon, 21 Sep 2020 18:27:04 +0200 Message-Id: <20200921162035.325075477@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200921162035.136047591@linuxfoundation.org> References: <20200921162035.136047591@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Luo Jiaxing [ Upstream commit 53de092f47ff40e8d4d78d590d95819d391bf2e0 ] It was discovered that sdparm will fail when attempting to disable write cache on a SATA disk connected via libsas. In the ATA command set the write cache state is controlled through the SET FEATURES operation. This is roughly corresponds to MODE SELECT in SCSI and the latter command is what is used in the SCSI-ATA translation layer. A subtle difference is that a MODE SELECT carries data whereas SET FEATURES is defined as a non-data command in ATA. Set the DMA data direction to DMA_NONE if the requested ATA command is identified as non-data. [mkp: commit desc] Fixes: fa1c1e8f1ece ("[SCSI] Add SATA support to libsas") Link: https://lore.kernel.org/r/1598426666-54544-1-git-send-email-luojiaxing@huawei.com Reviewed-by: John Garry Reviewed-by: Jason Yan Signed-off-by: Luo Jiaxing Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/libsas/sas_ata.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c index 87f5e694dbedd..b820c3a022eac 100644 --- a/drivers/scsi/libsas/sas_ata.c +++ b/drivers/scsi/libsas/sas_ata.c @@ -227,7 +227,10 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) task->num_scatter = si; } - task->data_dir = qc->dma_dir; + if (qc->tf.protocol == ATA_PROT_NODATA) + task->data_dir = DMA_NONE; + else + task->data_dir = qc->dma_dir; task->scatter = qc->sg; task->ata_task.retry_count = 1; task->task_state_flags = SAS_TASK_STATE_PENDING; -- 2.25.1