--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -125,8 +125,9 @@ EXPORT_SYMBOL_GPL(ufshcd_dump_regs);
 enum {
 	UFSHCD_MAX_CHANNEL	= 0,
 	UFSHCD_MAX_ID		= 1,
-	UFSHCD_CMD_PER_LUN	= 32,
-	UFSHCD_CAN_QUEUE	= 32,
+	UFSHCD_NUM_RESERVED	= 1,
+	UFSHCD_CMD_PER_LUN	= 32 - UFSHCD_NUM_RESERVED,
+	UFSHCD_CAN_QUEUE	= 32 - UFSHCD_NUM_RESERVED,
 };
 
 /* UFSHCD error handling flags */
@@ -2185,6 +2186,7 @@ static inline int ufshcd_hba_capabilitie
 	hba->nutrs = (hba->capabilities & MASK_TRANSFER_REQUESTS_SLOTS) + 1;
 	hba->nutmrs =
 	((hba->capabilities & MASK_TASK_MANAGEMENT_REQUEST_SLOTS) >> 16) + 1;
+	hba->reserved_slot = hba->nutrs - 1;
 
 	/* Read crypto capabilities */
 	err = ufshcd_hba_init_crypto_capabilities(hba);
@@ -2910,30 +2912,15 @@ static int ufshcd_wait_for_dev_cmd(struc
 static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
 		enum dev_cmd_type cmd_type, int timeout)
 {
-	struct request_queue *q = hba->cmd_queue;
 	DECLARE_COMPLETION_ONSTACK(wait);
-	struct request *req;
+	const u32 tag = hba->reserved_slot;
 	struct ufshcd_lrb *lrbp;
 	int err;
-	int tag;
 
-	down_read(&hba->clk_scaling_lock);
+	/* Protects use of hba->reserved_slot. */
+	lockdep_assert_held(&hba->dev_cmd.lock);
 
-	/*
-	 * Get free slot, sleep if slots are unavailable.
-	 * Even though we use wait_event() which sleeps indefinitely,
-	 * the maximum wait time is bounded by SCSI request timeout.
-	 */
-	req = blk_get_request(q, REQ_OP_DRV_OUT, 0);
-	if (IS_ERR(req)) {
-		err = PTR_ERR(req);
-		goto out_unlock;
-	}
-	tag = req->tag;
-	WARN_ONCE(tag < 0, "Invalid tag %d\n", tag);
-	/* Set the timeout such that the SCSI error handler is not activated. */
-	req->timeout = msecs_to_jiffies(2 * timeout);
-	blk_mq_start_request(req);
+	down_read(&hba->clk_scaling_lock);
 
 	lrbp = &hba->lrb[tag];
 	WARN_ON(lrbp->cmd);
@@ -2951,8 +2938,6 @@ static int ufshcd_exec_dev_cmd(struct uf
 				    (struct utp_upiu_req *)lrbp->ucd_rsp_ptr);
 
 out:
-	blk_put_request(req);
-out_unlock:
 	up_read(&hba->clk_scaling_lock);
 	return err;
 }
@@ -6640,23 +6625,16 @@ static int ufshcd_issue_devman_upiu_cmd(
 					enum dev_cmd_type cmd_type,
 					enum query_opcode desc_op)
 {
-	struct request_queue *q = hba->cmd_queue;
 	DECLARE_COMPLETION_ONSTACK(wait);
-	struct request *req;
+	const u32 tag = hba->reserved_slot;
 	struct ufshcd_lrb *lrbp;
 	int err = 0;
-	int tag;
 	u8 upiu_flags;
 
-	down_read(&hba->clk_scaling_lock);
+	/* Protects use of hba->reserved_slot. */
+	lockdep_assert_held(&hba->dev_cmd.lock);
 
-	req = blk_get_request(q, REQ_OP_DRV_OUT, 0);
-	if (IS_ERR(req)) {
-		err = PTR_ERR(req);
-		goto out_unlock;
-	}
-	tag = req->tag;
-	WARN_ONCE(tag < 0, "Invalid tag %d\n", tag);
+	down_read(&hba->clk_scaling_lock);
 
 	lrbp = &hba->lrb[tag];
 	WARN_ON(lrbp->cmd);
@@ -6725,9 +6703,6 @@ static int ufshcd_issue_devman_upiu_cmd(
 	ufshcd_add_query_upiu_trace(hba, err ? UFS_QUERY_ERR : UFS_QUERY_COMP,
 				    (struct utp_upiu_req *)lrbp->ucd_rsp_ptr);
 
-	blk_put_request(req);
-
-out_unlock:
 	up_read(&hba->clk_scaling_lock);
 	return err;
 }
@@ -9418,8 +9393,8 @@ int ufshcd_init(struct ufs_hba *hba, voi
 	/* Configure LRB */
 	ufshcd_host_memory_configure(hba);
 
-	host->can_queue = hba->nutrs;
-	host->cmd_per_lun = hba->nutrs;
+	host->can_queue = hba->nutrs - UFSHCD_NUM_RESERVED;
+	host->cmd_per_lun = hba->nutrs - UFSHCD_NUM_RESERVED;
 	host->max_id = UFSHCD_MAX_ID;
 	host->max_lun = UFS_MAX_LUNS;
 	host->max_channel = UFSHCD_MAX_CHANNEL;
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -725,6 +725,7 @@ struct ufs_hba_monitor {
  * @capabilities: UFS Controller Capabilities
  * @nutrs: Transfer Request Queue depth supported by controller
  * @nutmrs: Task Management Queue depth supported by controller
+ * @reserved_slot: Used to submit device commands. Protected by @dev_cmd.lock.
  * @ufs_version: UFS Version to which controller complies
  * @vops: pointer to variant specific operations
  * @priv: pointer to variant specific private data
@@ -813,6 +814,7 @@ struct ufs_hba {
 	u32 capabilities;
 	int nutrs;
 	int nutmrs;
+	u32 reserved_slot;
 	u32 ufs_version;
 	const struct ufs_hba_variant_ops *vops;
 	struct ufs_hba_variant_params *vps;
