scsi: ufs: Remove ufshcd_lrb.sense_buffer

ufshcd_lrb.sense_buffer is NULL if ufshcd_lrb.cmd is NULL and
ufshcd_lrb.sense_buffer points at cmd->sense_buffer if ufshcd_lrb.cmd is
set. In other words, the ufshcd_lrb.sense_buffer member is identical to
cmd->sense_buffer. Hence this patch that removes the
ufshcd_lrb.sense_buffer structure member.

Link: https://lore.kernel.org/r/20220419225811.4127248-7-bvanassche@acm.orgTested-by: Bean Huo <beanhuo@micron.com>
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/ufs/ufshcd.c

@@ -2127,15 +2127,17 @@ void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag)
  */
 static inline void ufshcd_copy_sense_data(struct ufshcd_lrb *lrbp)
 {
+	u8 *const sense_buffer = lrbp->cmd->sense_buffer;
 	int len;
-	if (lrbp->sense_buffer &&
+
+	if (sense_buffer &&
 	    ufshcd_get_rsp_upiu_data_seg_len(lrbp->ucd_rsp_ptr)) {
 		int len_to_copy;
 
 		len = be16_to_cpu(lrbp->ucd_rsp_ptr->sr.sense_data_len);
 		len_to_copy = min_t(int, UFS_SENSE_SIZE, len);
 
-		memcpy(lrbp->sense_buffer, lrbp->ucd_rsp_ptr->sr.sense_data,
+		memcpy(sense_buffer, lrbp->ucd_rsp_ptr->sr.sense_data,
 		       len_to_copy);
 	}
 }
@@ -2789,7 +2791,6 @@ static int ufshcd_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 	lrbp = &hba->lrb[tag];
 	WARN_ON(lrbp->cmd);
 	lrbp->cmd = cmd;
-	lrbp->sense_buffer = cmd->sense_buffer;
 	lrbp->task_tag = tag;
 	lrbp->lun = ufshcd_scsi_to_upiu_lun(cmd->device->lun);
 	lrbp->intr_cmd = !ufshcd_is_intr_aggr_allowed(hba);
@@ -2829,7 +2830,6 @@ static int ufshcd_compose_dev_cmd(struct ufs_hba *hba,
 		struct ufshcd_lrb *lrbp, enum dev_cmd_type cmd_type, int tag)
 {
 	lrbp->cmd = NULL;
-	lrbp->sense_buffer = NULL;
 	lrbp->task_tag = tag;
 	lrbp->lun = 0; /* device management cmd is not specific to any LUN */
 	lrbp->intr_cmd = true; /* No interrupt aggregation */
@@ -6800,7 +6800,6 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
 	lrbp = &hba->lrb[tag];
 	WARN_ON(lrbp->cmd);
 	lrbp->cmd = NULL;
-	lrbp->sense_buffer = NULL;
 	lrbp->task_tag = tag;
 	lrbp->lun = 0;
 	lrbp->intr_cmd = true;

drivers/scsi/ufs/ufshcd.h

@@ -181,7 +181,6 @@ struct ufs_pm_lvl_states {
  * @ucd_rsp_dma_addr: UPIU response dma address for debug
  * @ucd_req_dma_addr: UPIU request dma address for debug
  * @cmd: pointer to SCSI command
- * @sense_buffer: pointer to sense buffer address of the SCSI command
  * @scsi_status: SCSI status of the command
  * @command_type: SCSI, UFS, Query.
  * @task_tag: Task tag of the command
@@ -205,7 +204,6 @@ struct ufshcd_lrb {
 	dma_addr_t ucd_prdt_dma_addr;
 
 	struct scsi_cmnd *cmd;
-	u8 *sense_buffer;
 	int scsi_status;
 
 	int command_type;