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Commit 3ef1af14 authored by Subhash Jadavani's avatar Subhash Jadavani
Browse files

scsi: ufs: clear fields UTRD, UPIU req and rsp before new transfers 



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.

Change-Id: Iac02618cd5e9d97883652e134c5365884f3d0b44
Signed-off-by: default avatarSubhash Jadavani <subhashj@codeaurora.org>
parent 5c17c2e7

drivers/scsi/ufs/ufshcd.c

+8 −0
Original line number Diff line number Diff line
@@ -2032,6 +2032,8 @@ 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;

}



/**
@@ -2101,6 +2103,7 @@ 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)
@@ -2113,6 +2116,11 @@ 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));

}



/**