From patchwork Tue Jun 18 01:37:55 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ming Lei X-Patchwork-Id: 11000783 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4BD7314E5 for ; Tue, 18 Jun 2019 01:39:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3A60028614 for ; Tue, 18 Jun 2019 01:39:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2E3B92868D; Tue, 18 Jun 2019 01:39:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id DCCC2286CC for ; Tue, 18 Jun 2019 01:39:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727768AbfFRBjc (ORCPT ); Mon, 17 Jun 2019 21:39:32 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42828 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726243AbfFRBjc (ORCPT ); Mon, 17 Jun 2019 21:39:32 -0400 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B91CB307D85A; Tue, 18 Jun 2019 01:39:31 +0000 (UTC) Received: from localhost (ovpn-8-17.pek2.redhat.com [10.72.8.17]) by smtp.corp.redhat.com (Postfix) with ESMTP id BB41591F23; Tue, 18 Jun 2019 01:39:28 +0000 (UTC) From: Ming Lei To: linux-scsi@vger.kernel.org, "Martin K . Petersen" Cc: James Bottomley , Bart Van Assche , Hannes Reinecke , Christoph Hellwig , Jim Gill , Cathy Avery , "Ewan D . Milne" , Brian King , James Smart , "Juergen E . Fischer" , Michael Schmitz , Finn Thain , Greg Kroah-Hartman , devel@driverdev.osuosl.org, linux-usb@vger.kernel.org, Dan Carpenter , Benjamin Block , Ming Lei Subject: [PATCH V5 14/16] scsi: ppa: use sg helper to operate scatterlist Date: Tue, 18 Jun 2019 09:37:55 +0800 Message-Id: <20190618013757.22401-15-ming.lei@redhat.com> In-Reply-To: <20190618013757.22401-1-ming.lei@redhat.com> References: <20190618013757.22401-1-ming.lei@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.48]); Tue, 18 Jun 2019 01:39:31 +0000 (UTC) Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Use the scatterlist iterators and remove direct indexing of the scatterlist array. This way allows us to pre-allocate one small scatterlist, which can be chained with one runtime allocated scatterlist if the pre-allocated one isn't enough for the whole request. Reviewed-by: Christoph Hellwig Reviewed-by: Bart Van Assche Signed-off-by: Ming Lei --- drivers/scsi/ppa.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/ppa.c b/drivers/scsi/ppa.c index 35213082e933..a406cc825426 100644 --- a/drivers/scsi/ppa.c +++ b/drivers/scsi/ppa.c @@ -590,7 +590,7 @@ static int ppa_completion(struct scsi_cmnd *cmd) if (cmd->SCp.buffer && !cmd->SCp.this_residual) { /* if scatter/gather, advance to the next segment */ if (cmd->SCp.buffers_residual--) { - cmd->SCp.buffer++; + cmd->SCp.buffer = sg_next(cmd->SCp.buffer); cmd->SCp.this_residual = cmd->SCp.buffer->length; cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);