linux-kernel - Re: [PATCH v3 02/15] scsi: ufs: clear fields UTRD, UPIU req and rsp before new transfers

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Date:	Thu, 22 Oct 2015 07:14:57 -0000
From:	subhashj@...eaurora.org
To:	"Yaniv Gardi" <ygardi@...eaurora.org>
Cc:	robherring2@...il.com, james.bottomley@...senpartnership.com,
	pebolle@...cali.nl, hch@...radead.org,
	linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, santoshsy@...il.com,
	linux-scsi-owner@...r.kernel.org, subhashj@...eaurora.org,
	ygardi@...eaurora.org, gbroner@...eaurora.org,
	draviv@...eaurora.org,
	"Vinayak Holikatti" <vinholikatti@...il.com>,
	"James E.J. Bottomley" <jbottomley@...n.com>
Subject: Re: [PATCH v3 02/15] scsi: ufs: clear fields UTRD, UPIU req and rsp
 before new transfers

Looks good to me.
Reviewed-by: Subhash Jadavani <subhashj@...eaurora.org>



> 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 <subhashj@...eaurora.org>
> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>
> ---
>  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
> --
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