Looks OK.
Reviewed-by: Gilad Broner <gbro...@codeaurora.org>
> Clear the UFS data structures before sending new request.
>
> The SCSI command is sent to the device within the UFS UPIU request.
> As part of the transfer UPIU preparation, the SCSI command is copied
> to the UPIU structure according to the SCSI command size.
> As different SCSI commands differ in size from each other, we need
> to clear the whole SCSI command field to prevent sending uninitialized
> data to the device.
>
> The UPIU response doesn't always include the sense data and can differ
> in size.
> Hence, the UPIU response should also be cleared before the transfer.
>
> Signed-off-by: Subhash Jadavani <subha...@codeaurora.org>
> Signed-off-by: Maya Erez <me...@codeaurora.org>
> Signed-off-by: Yaniv Gardi <yga...@codeaurora.org>
>
> ---
> drivers/scsi/ufs/ufshcd.c | 17 +++++++++++++----
> 1 file changed, 13 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index 131c720..3428f72 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -3,7 +3,7 @@
> *
> * This code is based on drivers/scsi/ufs/ufshcd.c
> * Copyright (C) 2011-2013 Samsung India Software Operations
> - * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
> *
> * Authors:
> * Santosh Yaraganavi <santosh...@samsung.com>
> @@ -1035,6 +1035,7 @@ static int ufshcd_map_sg(struct ufshcd_lrb *lrbp)
> cpu_to_le32(lower_32_bits(sg->dma_address));
> prd_table[i].upper_addr =
> cpu_to_le32(upper_32_bits(sg->dma_address));
> + prd_table[i].reserved = 0;
> }
> } else {
> lrbp->utr_descriptor_ptr->prd_table_length = 0;
> @@ -1117,7 +1118,8 @@ static void ufshcd_prepare_req_desc_hdr(struct
> ufshcd_lrb *lrbp,
>
> /* Transfer request descriptor header fields */
> req_desc->header.dword_0 = cpu_to_le32(dword_0);
> -
> + /* dword_1 is reserved, hence it is set to 0 */
> + req_desc->header.dword_1 = 0;
> /*
> * assigning invalid value for command status. Controller
> * updates OCS on command completion, with the command
> @@ -1125,6 +1127,8 @@ static void ufshcd_prepare_req_desc_hdr(struct
> ufshcd_lrb *lrbp,
> */
> req_desc->header.dword_2 =
> cpu_to_le32(OCS_INVALID_COMMAND_STATUS);
> + /* dword_3 is reserved, hence it is set to 0 */
> + req_desc->header.dword_3 = 0;
> }
>
> /**
> @@ -1137,6 +1141,7 @@ static
> void ufshcd_prepare_utp_scsi_cmd_upiu(struct ufshcd_lrb *lrbp, u32
> upiu_flags)
> {
> struct utp_upiu_req *ucd_req_ptr = lrbp->ucd_req_ptr;
> + unsigned short cdb_len;
>
> /* command descriptor fields */
> ucd_req_ptr->header.dword_0 = UPIU_HEADER_DWORD(
> @@ -1151,8 +1156,12 @@ void ufshcd_prepare_utp_scsi_cmd_upiu(struct
> ufshcd_lrb *lrbp, u32 upiu_flags)
> ucd_req_ptr->sc.exp_data_transfer_len =
> cpu_to_be32(lrbp->cmd->sdb.length);
>
> - memcpy(ucd_req_ptr->sc.cdb, lrbp->cmd->cmnd,
> - (min_t(unsigned short, lrbp->cmd->cmd_len, MAX_CDB_SIZE)));
> + cdb_len = min_t(unsigned short, lrbp->cmd->cmd_len, MAX_CDB_SIZE);
> + memcpy(ucd_req_ptr->sc.cdb, lrbp->cmd->cmnd, cdb_len);
> + if (cdb_len < MAX_CDB_SIZE)
> + memset(ucd_req_ptr->sc.cdb + cdb_len, 0,
> + (MAX_CDB_SIZE - cdb_len));
> + 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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