From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756923AbbJVHPB (ORCPT ); Thu, 22 Oct 2015 03:15:01 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:37922 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752197AbbJVHO7 (ORCPT ); Thu, 22 Oct 2015 03:14:59 -0400 Message-ID: <82de867201280d01e2a5bb648479ee6d.squirrel@codeaurora.org> In-Reply-To: <1441188795-4600-3-git-send-email-ygardi@codeaurora.org> References: <1441188795-4600-1-git-send-email-ygardi@codeaurora.org> <1441188795-4600-3-git-send-email-ygardi@codeaurora.org> Date: Thu, 22 Oct 2015 07:14:57 -0000 Subject: Re: [PATCH v3 02/15] scsi: ufs: clear fields UTRD, UPIU req and rsp before new transfers From: subhashj@codeaurora.org To: "Yaniv Gardi" Cc: robherring2@gmail.com, james.bottomley@hansenpartnership.com, pebolle@tiscali.nl, hch@infradead.org, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-arm-msm@vger.kernel.org, santoshsy@gmail.com, linux-scsi-owner@vger.kernel.org, subhashj@codeaurora.org, ygardi@codeaurora.org, gbroner@codeaurora.org, draviv@codeaurora.org, "Vinayak Holikatti" , "James E.J. Bottomley" User-Agent: SquirrelMail/1.4.22-4.el6 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT X-Priority: 3 (Normal) Importance: Normal Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Looks good to me. Reviewed-by: Subhash Jadavani > Some of the data structures (like response UPIU) and/or its elements > (unused fields) should be cleared before sending out the respective > command to UFS device. > > This change clears the UPIU response data structure for query commands > and NOP command before sending out the command. We also initialize the > PRDT table length to zero which should take care of commands which doesn't > have any data associated with it. We are also clearing the unused fields > in > request UPIU for NOP command. > > Signed-off-by: Subhash Jadavani > Signed-off-by: Yaniv Gardi > > --- > drivers/scsi/ufs/ufshcd.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c > index 3428f72..2d3ebca 100644 > --- a/drivers/scsi/ufs/ufshcd.c > +++ b/drivers/scsi/ufs/ufshcd.c > @@ -1129,6 +1129,8 @@ static void ufshcd_prepare_req_desc_hdr(struct > ufshcd_lrb *lrbp, > cpu_to_le32(OCS_INVALID_COMMAND_STATUS); > /* dword_3 is reserved, hence it is set to 0 */ > req_desc->header.dword_3 = 0; > + > + req_desc->prd_table_length = 0; > } > > /** > @@ -1198,6 +1200,7 @@ static void ufshcd_prepare_utp_query_req_upiu(struct > ufs_hba *hba, > if (query->request.upiu_req.opcode == UPIU_QUERY_OPCODE_WRITE_DESC) > memcpy(descp, query->descriptor, len); > > + memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp)); > } > > static inline void ufshcd_prepare_utp_nop_upiu(struct ufshcd_lrb *lrbp) > @@ -1210,6 +1213,11 @@ static inline void > ufshcd_prepare_utp_nop_upiu(struct ufshcd_lrb *lrbp) > ucd_req_ptr->header.dword_0 = > UPIU_HEADER_DWORD( > UPIU_TRANSACTION_NOP_OUT, 0, 0, lrbp->task_tag); > + /* clear rest of the fields of basic header */ > + ucd_req_ptr->header.dword_1 = 0; > + ucd_req_ptr->header.dword_2 = 0; > + > + memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp)); > } > > /** > -- > 1.8.5.2 > > -- > QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member > of Code Aurora Forum, hosted by The Linux Foundation > -- > To unsubscribe from this list: send the line "unsubscribe linux-scsi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >