From 52ac95fe06edd660a6414fd6aa3165c3437ac4be Mon Sep 17 00:00:00 2001 From: Yaniv Gardi Date: Mon, 1 Feb 2016 15:02:37 +0200 Subject: [PATCH] scsi: ufs: clear UTRD, UPIU req and rsp before new transfers 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. Reviewed-by: Gilad Broner Reviewed-by: Dolev Raviv Signed-off-by: Subhash Jadavani Signed-off-by: Maya Erez Signed-off-by: Yaniv Gardi Signed-off-by: Martin K. Petersen --- drivers/scsi/ufs/ufshcd.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index 85cd256..03533f0 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) 2013-2016, The Linux Foundation. All rights reserved. * * Authors: * Santosh Yaraganavi @@ -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 +1156,11 @@ 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); + memset(ucd_req_ptr->sc.cdb, 0, MAX_CDB_SIZE); + memcpy(ucd_req_ptr->sc.cdb, lrbp->cmd->cmnd, cdb_len); + + memset(lrbp->ucd_rsp_ptr, 0, sizeof(struct utp_upiu_rsp)); } /** -- 2.7.4