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Groups > linux.kernel > #1323074

[PATCH v7 01/14] scsi: ufs: clear UTRD, UPIU req and rsp before new transfers

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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 <gbroner@codeaurora.org>
Reviewed-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Maya Erez <merez@codeaurora.org>
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>

---
 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 <santosh.sy@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 +1156,11 @@ 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));
 }
 
 /**
-- 
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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Thread

[PATCH v7 00/14] Big fixes, retries, handle a race condition Yaniv Gardi <ygardi@codeaurora.org> - 2016-02-01 14:10 +0100
  [PATCH v7 01/14] scsi: ufs: clear UTRD, UPIU req and rsp before new transfers Yaniv Gardi <ygardi@codeaurora.org> - 2016-02-01 14:10 +0100
  [PATCH v7 03/14] scsi: ufs: verify command tag validity Yaniv Gardi <ygardi@codeaurora.org> - 2016-02-01 14:10 +0100
  [PATCH v7 11/14] scsi: ufs: reduce the interrupts for power mode change requests Yaniv Gardi <ygardi@codeaurora.org> - 2016-02-01 14:10 +0100
  [PATCH v7 09/14] scsi: ufs: fix error recovery after the hibern8 exit failure Yaniv Gardi <ygardi@codeaurora.org> - 2016-02-01 14:10 +0100
  [PATCH v7 05/14] scsi: ufs: increase fDeviceInit query response timeout Yaniv Gardi <ygardi@codeaurora.org> - 2016-02-01 14:10 +0100
  [PATCH v7 10/14] scsi: ufs: retry failed query flag requests Yaniv Gardi <ygardi@codeaurora.org> - 2016-02-01 14:10 +0100
  [PATCH v7 12/14] scsi: ufs: add missing memory barriers Yaniv Gardi <ygardi@codeaurora.org> - 2016-02-01 14:10 +0100
  [PATCH v7 14/14] scsi: ufs: add wrapper for retrying sending query attribute Yaniv Gardi <ygardi@codeaurora.org> - 2016-02-01 14:10 +0100
  [PATCH v7 04/14] scsi: ufs: clear outstanding_request bit in case query timeout Yaniv Gardi <ygardi@codeaurora.org> - 2016-02-01 14:10 +0100
  [PATCH v7 02/14] scsi: ufs: clear fields UTRD, UPIU req and rsp before new transfers Yaniv Gardi <ygardi@codeaurora.org> - 2016-02-01 14:20 +0100
    RE: [PATCH v7 02/14] scsi: ufs: clear fields UTRD, UPIU req and rsp  before new transfers "Winkler, Tomas" <tomas.winkler@intel.com> - 2016-02-02 11:10 +0100

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