diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 156d4b97d2bd..f99db18c809c 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -1016,6 +1016,12 @@ struct megasas_ctrl_info {
 
 #define VD_EXT_DEBUG 0
 
+enum MR_MFI_MPT_PTHR_FLAGS {
+	MFI_MPT_DETACHED = 0,
+	MFI_LIST_ADDED = 1,
+	MFI_MPT_ATTACHED = 2,
+};
+
 /* Frame Type */
 #define IO_FRAME				0
 #define PTHRU_FRAME				1
@@ -1033,7 +1039,7 @@ struct megasas_ctrl_info {
 #define MEGASAS_IOCTL_CMD			0
 #define MEGASAS_DEFAULT_CMD_TIMEOUT		90
 #define MEGASAS_THROTTLE_QUEUE_DEPTH		16
-
+#define MEGASAS_BLOCKED_CMD_TIMEOUT		60
 /*
  * FW reports the maximum of number of commands that it can accept (maximum
  * commands that can be outstanding) at any time. The driver must report a
@@ -1652,7 +1658,7 @@ struct megasas_instance {
 	struct megasas_cmd **cmd_list;
 	struct list_head cmd_pool;
 	/* used to sync fire the cmd to fw */
-	spinlock_t cmd_pool_lock;
+	spinlock_t mfi_pool_lock;
 	/* used to sync fire the cmd to fw */
 	spinlock_t hba_lock;
 	/* used to synch producer, consumer ptrs in dpc */
@@ -1839,6 +1845,11 @@ struct megasas_cmd {
 
 	struct list_head list;
 	struct scsi_cmnd *scmd;
+
+	void *mpt_pthr_cmd_blocked;
+	atomic_t mfi_mpt_pthr;
+	u8 is_wait_event;
+
 	struct megasas_instance *instance;
 	union {
 		struct {
@@ -1927,4 +1938,14 @@ int megasas_set_crash_dump_params(struct megasas_instance *instance,
 void megasas_free_host_crash_buffer(struct megasas_instance *instance);
 void megasas_fusion_crash_dump_wq(struct work_struct *work);
 
+void megasas_return_cmd_fusion(struct megasas_instance *instance,
+	struct megasas_cmd_fusion *cmd);
+int megasas_issue_blocked_cmd(struct megasas_instance *instance,
+	struct megasas_cmd *cmd, int timeout);
+void __megasas_return_cmd(struct megasas_instance *instance,
+	struct megasas_cmd *cmd);
+
+void megasas_return_mfi_mpt_pthr(struct megasas_instance *instance,
+	struct megasas_cmd *cmd_mfi, struct megasas_cmd_fusion *cmd_fusion);
+
 #endif				/*LSI_MEGARAID_SAS_H */
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 4c4c266e2388..d8cc9227e1ef 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -210,20 +210,53 @@ struct megasas_cmd *megasas_get_cmd(struct megasas_instance
 	unsigned long flags;
 	struct megasas_cmd *cmd = NULL;
 
-	spin_lock_irqsave(&instance->cmd_pool_lock, flags);
+	spin_lock_irqsave(&instance->mfi_pool_lock, flags);
 
 	if (!list_empty(&instance->cmd_pool)) {
 		cmd = list_entry((&instance->cmd_pool)->next,
 				 struct megasas_cmd, list);
 		list_del_init(&cmd->list);
+		atomic_set(&cmd->mfi_mpt_pthr, MFI_MPT_DETACHED);
 	} else {
 		printk(KERN_ERR "megasas: Command pool empty!\n");
 	}
 
-	spin_unlock_irqrestore(&instance->cmd_pool_lock, flags);
+	spin_unlock_irqrestore(&instance->mfi_pool_lock, flags);
 	return cmd;
 }
 
+/**
+ * __megasas_return_cmd -	Return a cmd to free command pool
+ * @instance:		Adapter soft state
+ * @cmd:		Command packet to be returned to free command pool
+ */
+inline void
+__megasas_return_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd)
+{
+	/*
+	 * Don't go ahead and free the MFI frame, if corresponding
+	 * MPT frame is not freed(valid for only fusion adapters).
+	 * In case of MFI adapters, anyways for any allocated MFI
+	 * frame will have cmd->mfi_mpt_mpthr set to MFI_MPT_DETACHED
+	 */
+	if (atomic_read(&cmd->mfi_mpt_pthr) != MFI_MPT_DETACHED)
+		return;
+
+	cmd->scmd = NULL;
+	cmd->frame_count = 0;
+	cmd->is_wait_event = 0;
+	cmd->mpt_pthr_cmd_blocked = NULL;
+
+	if ((instance->pdev->device != PCI_DEVICE_ID_LSI_FUSION) &&
+	    (instance->pdev->device != PCI_DEVICE_ID_LSI_INVADER) &&
+	    (instance->pdev->device != PCI_DEVICE_ID_LSI_FURY) &&
+	    (reset_devices))
+		cmd->frame->hdr.cmd = MFI_CMD_INVALID;
+
+	atomic_set(&cmd->mfi_mpt_pthr, MFI_LIST_ADDED);
+	list_add(&cmd->list, (&instance->cmd_pool)->next);
+}
+
 /**
  * megasas_return_cmd -	Return a cmd to free command pool
  * @instance:		Adapter soft state
@@ -234,19 +267,9 @@ megasas_return_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd)
 {
 	unsigned long flags;
 
-	spin_lock_irqsave(&instance->cmd_pool_lock, flags);
-
-	cmd->scmd = NULL;
-	cmd->frame_count = 0;
-	if ((instance->pdev->device != PCI_DEVICE_ID_LSI_FUSION) &&
-	    (instance->pdev->device != PCI_DEVICE_ID_LSI_PLASMA) &&
-	    (instance->pdev->device != PCI_DEVICE_ID_LSI_INVADER) &&
-	    (instance->pdev->device != PCI_DEVICE_ID_LSI_FURY) &&
-	    (reset_devices))
-		cmd->frame->hdr.cmd = MFI_CMD_INVALID;
-	list_add_tail(&cmd->list, &instance->cmd_pool);
-
-	spin_unlock_irqrestore(&instance->cmd_pool_lock, flags);
+	spin_lock_irqsave(&instance->mfi_pool_lock, flags);
+	__megasas_return_cmd(instance, cmd);
+	spin_unlock_irqrestore(&instance->mfi_pool_lock, flags);
 }
 
 
@@ -925,13 +948,14 @@ megasas_issue_polled(struct megasas_instance *instance, struct megasas_cmd *cmd)
  * Max wait time is MEGASAS_INTERNAL_CMD_WAIT_TIME secs
  * Used to issue ioctl commands.
  */
-static int
+int
 megasas_issue_blocked_cmd(struct megasas_instance *instance,
 			  struct megasas_cmd *cmd, int timeout)
 {
 	int ret = 0;
 	cmd->cmd_status = ENODATA;
 
+	cmd->is_wait_event = 1;
 	instance->instancet->issue_dcmd(instance, cmd);
 	if (timeout) {
 		ret = wait_event_timeout(instance->int_cmd_wait_q,
@@ -1903,7 +1927,12 @@ static int megasas_get_ld_vf_affiliation_111(struct megasas_instance *instance,
 				    new_affiliation_111,
 				    new_affiliation_111_h);
 	}
-	megasas_return_cmd(instance, cmd);
+
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 
 	return retval;
 }
@@ -2070,7 +2099,11 @@ static int megasas_get_ld_vf_affiliation_12(struct megasas_instance *instance,
 				    (MAX_LOGICAL_DRIVES + 1) *
 				    sizeof(struct MR_LD_VF_AFFILIATION),
 				    new_affiliation, new_affiliation_h);
-	megasas_return_cmd(instance, cmd);
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 
 	return retval;
 }
@@ -2530,7 +2563,12 @@ megasas_service_aen(struct megasas_instance *instance, struct megasas_cmd *cmd)
 		cmd->abort_aen = 0;
 
 	instance->aen_cmd = NULL;
-	megasas_return_cmd(instance, cmd);
+
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 
 	if ((instance->unload == 0) &&
 		((instance->issuepend_done == 1))) {
@@ -2906,7 +2944,8 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
 					       "failed, status = 0x%x.\n",
 					       cmd->frame->hdr.cmd_status);
 				else {
-					megasas_return_cmd(instance, cmd);
+					megasas_return_mfi_mpt_pthr(instance,
+						cmd, cmd->mpt_pthr_cmd_blocked);
 					spin_unlock_irqrestore(
 						instance->host->host_lock,
 						flags);
@@ -2914,7 +2953,8 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
 				}
 			} else
 				instance->map_id++;
-			megasas_return_cmd(instance, cmd);
+			megasas_return_mfi_mpt_pthr(instance, cmd,
+				cmd->mpt_pthr_cmd_blocked);
 
 			/*
 			 * Set fast path IO to ZERO.
@@ -3070,7 +3110,7 @@ megasas_internal_reset_defer_cmds(struct megasas_instance *instance)
 	unsigned long flags;
 
 	defer_index     = 0;
-	spin_lock_irqsave(&instance->cmd_pool_lock, flags);
+	spin_lock_irqsave(&instance->mfi_pool_lock, flags);
 	for (i = 0; i < max_cmd; i++) {
 		cmd = instance->cmd_list[i];
 		if (cmd->sync_cmd == 1 || cmd->scmd) {
@@ -3091,7 +3131,7 @@ megasas_internal_reset_defer_cmds(struct megasas_instance *instance)
 				&instance->internal_reset_pending_q);
 		}
 	}
-	spin_unlock_irqrestore(&instance->cmd_pool_lock, flags);
+	spin_unlock_irqrestore(&instance->mfi_pool_lock, flags);
 }
 
 
@@ -3656,7 +3696,9 @@ int megasas_alloc_cmds(struct megasas_instance *instance)
 	int j;
 	u32 max_cmd;
 	struct megasas_cmd *cmd;
+	struct fusion_context *fusion;
 
+	fusion = instance->ctrl_context;
 	max_cmd = instance->max_mfi_cmds;
 
 	/*
@@ -3689,13 +3731,11 @@ int megasas_alloc_cmds(struct megasas_instance *instance)
 		}
 	}
 
-	/*
-	 * Add all the commands to command pool (instance->cmd_pool)
-	 */
 	for (i = 0; i < max_cmd; i++) {
 		cmd = instance->cmd_list[i];
 		memset(cmd, 0, sizeof(struct megasas_cmd));
 		cmd->index = i;
+		atomic_set(&cmd->mfi_mpt_pthr, MFI_LIST_ADDED);
 		cmd->scmd = NULL;
 		cmd->instance = instance;
 
@@ -3766,11 +3806,11 @@ megasas_get_pd_list(struct megasas_instance *instance)
 	dcmd->sgl.sge32[0].phys_addr = cpu_to_le32(ci_h);
 	dcmd->sgl.sge32[0].length = cpu_to_le32(MEGASAS_MAX_PD * sizeof(struct MR_PD_LIST));
 
-	if (!megasas_issue_polled(instance, cmd)) {
-		ret = 0;
-	} else {
-		ret = -1;
-	}
+	if (instance->ctrl_context && !instance->mask_interrupts)
+		ret = megasas_issue_blocked_cmd(instance, cmd,
+			MEGASAS_BLOCKED_CMD_TIMEOUT);
+	else
+		ret = megasas_issue_polled(instance, cmd);
 
 	/*
 	* the following function will get the instance PD LIST.
@@ -3802,7 +3842,12 @@ megasas_get_pd_list(struct megasas_instance *instance)
 	pci_free_consistent(instance->pdev,
 				MEGASAS_MAX_PD * sizeof(struct MR_PD_LIST),
 				ci, ci_h);
-	megasas_return_cmd(instance, cmd);
+
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 
 	return ret;
 }
@@ -3861,11 +3906,12 @@ megasas_get_ld_list(struct megasas_instance *instance)
 	dcmd->sgl.sge32[0].length = cpu_to_le32(sizeof(struct MR_LD_LIST));
 	dcmd->pad_0  = 0;
 
-	if (!megasas_issue_polled(instance, cmd)) {
-		ret = 0;
-	} else {
-		ret = -1;
-	}
+	if (instance->ctrl_context && !instance->mask_interrupts)
+		ret = megasas_issue_blocked_cmd(instance, cmd,
+			MEGASAS_BLOCKED_CMD_TIMEOUT);
+	else
+		ret = megasas_issue_polled(instance, cmd);
+
 
 	ld_count = le32_to_cpu(ci->ldCount);
 
@@ -3888,7 +3934,11 @@ megasas_get_ld_list(struct megasas_instance *instance)
 				ci,
 				ci_h);
 
-	megasas_return_cmd(instance, cmd);
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 	return ret;
 }
 
@@ -3949,12 +3999,11 @@ megasas_ld_list_query(struct megasas_instance *instance, u8 query_type)
 	dcmd->sgl.sge32[0].length = cpu_to_le32(sizeof(struct MR_LD_TARGETID_LIST));
 	dcmd->pad_0  = 0;
 
-	if (!megasas_issue_polled(instance, cmd) && !dcmd->cmd_status) {
-		ret = 0;
-	} else {
-		/* On failure, call older LD list DCMD */
-		ret = 1;
-	}
+	if (instance->ctrl_context && !instance->mask_interrupts)
+		ret = megasas_issue_blocked_cmd(instance, cmd,
+			MEGASAS_BLOCKED_CMD_TIMEOUT);
+	else
+		ret = megasas_issue_polled(instance, cmd);
 
 	tgtid_count = le32_to_cpu(ci->count);
 
@@ -3970,7 +4019,11 @@ megasas_ld_list_query(struct megasas_instance *instance, u8 query_type)
 	pci_free_consistent(instance->pdev, sizeof(struct MR_LD_TARGETID_LIST),
 			    ci, ci_h);
 
-	megasas_return_cmd(instance, cmd);
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 
 	return ret;
 }
@@ -4027,17 +4080,23 @@ megasas_get_ctrl_info(struct megasas_instance *instance,
 	dcmd->sgl.sge32[0].length = cpu_to_le32(sizeof(struct megasas_ctrl_info));
 	dcmd->mbox.b[0] = 1;
 
-	if (!megasas_issue_polled(instance, cmd)) {
-		ret = 0;
+	if (instance->ctrl_context && !instance->mask_interrupts)
+		ret = megasas_issue_blocked_cmd(instance, cmd,
+			MEGASAS_BLOCKED_CMD_TIMEOUT);
+	else
+		ret = megasas_issue_polled(instance, cmd);
+
+	if (!ret)
 		memcpy(ctrl_info, ci, sizeof(struct megasas_ctrl_info));
-	} else {
-		ret = -1;
-	}
 
 	pci_free_consistent(instance->pdev, sizeof(struct megasas_ctrl_info),
 			    ci, ci_h);
 
-	megasas_return_cmd(instance, cmd);
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 	return ret;
 }
 
@@ -4086,11 +4145,17 @@ int megasas_set_crash_dump_params(struct megasas_instance *instance,
 	dcmd->sgl.sge32[0].phys_addr = cpu_to_le32(instance->crash_dump_h);
 	dcmd->sgl.sge32[0].length = cpu_to_le32(CRASH_DMA_BUF_SIZE);
 
-	if (!megasas_issue_polled(instance, cmd))
-		ret = 0;
+	if (instance->ctrl_context && !instance->mask_interrupts)
+		ret = megasas_issue_blocked_cmd(instance, cmd,
+			MEGASAS_BLOCKED_CMD_TIMEOUT);
 	else
-		ret = -1;
-	megasas_return_cmd(instance, cmd);
+		ret = megasas_issue_polled(instance, cmd);
+
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 	return ret;
 }
 
@@ -4660,7 +4725,11 @@ megasas_get_seq_num(struct megasas_instance *instance,
 	pci_free_consistent(instance->pdev, sizeof(struct megasas_evt_log_info),
 			    el_info, el_info_h);
 
-	megasas_return_cmd(instance, cmd);
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 
 	return 0;
 }
@@ -5015,7 +5084,7 @@ static int megasas_probe_one(struct pci_dev *pdev,
 		}
 		fusion = instance->ctrl_context;
 		INIT_LIST_HEAD(&fusion->cmd_pool);
-		spin_lock_init(&fusion->cmd_pool_lock);
+		spin_lock_init(&fusion->mpt_pool_lock);
 		memset(fusion->load_balance_info, 0,
 			sizeof(struct LD_LOAD_BALANCE_INFO) * MAX_LOGICAL_DRIVES_EXT);
 	}
@@ -5086,7 +5155,7 @@ static int megasas_probe_one(struct pci_dev *pdev,
 	init_waitqueue_head(&instance->int_cmd_wait_q);
 	init_waitqueue_head(&instance->abort_cmd_wait_q);
 
-	spin_lock_init(&instance->cmd_pool_lock);
+	spin_lock_init(&instance->mfi_pool_lock);
 	spin_lock_init(&instance->hba_lock);
 	spin_lock_init(&instance->completion_lock);
 
@@ -5106,7 +5175,7 @@ static int megasas_probe_one(struct pci_dev *pdev,
 		instance->flag_ieee = 1;
 		sema_init(&instance->ioctl_sem, MEGASAS_SKINNY_INT_CMDS);
 	} else
-		sema_init(&instance->ioctl_sem, MEGASAS_INT_CMDS);
+		sema_init(&instance->ioctl_sem, (MEGASAS_INT_CMDS - 5));
 
 	megasas_dbg_lvl = 0;
 	instance->flag = 0;
@@ -5318,7 +5387,11 @@ static void megasas_flush_cache(struct megasas_instance *instance)
 		dev_err(&instance->pdev->dev, "Command timedout"
 			" from %s\n", __func__);
 
-	megasas_return_cmd(instance, cmd);
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 
 	return;
 }
@@ -5365,7 +5438,11 @@ static void megasas_shutdown_controller(struct megasas_instance *instance,
 		dev_err(&instance->pdev->dev, "Command timedout"
 			"from %s\n", __func__);
 
-	megasas_return_cmd(instance, cmd);
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 
 	return;
 }
@@ -6026,9 +6103,14 @@ megasas_mgmt_fw_ioctl(struct megasas_instance *instance,
 					  le32_to_cpu(kern_sge32[i].length),
 					  kbuff_arr[i],
 					  le32_to_cpu(kern_sge32[i].phys_addr));
+			kbuff_arr[i] = NULL;
 	}
 
-	megasas_return_cmd(instance, cmd);
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 	return error;
 }
 
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 54c720ccb3e6..f37eed682c75 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -50,6 +50,7 @@
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_host.h>
+#include <scsi/scsi_dbg.h>
 
 #include "megaraid_sas_fusion.h"
 #include "megaraid_sas.h"
@@ -163,7 +164,7 @@ struct megasas_cmd_fusion *megasas_get_cmd_fusion(struct megasas_instance
 		(struct fusion_context *)instance->ctrl_context;
 	struct megasas_cmd_fusion *cmd = NULL;
 
-	spin_lock_irqsave(&fusion->cmd_pool_lock, flags);
+	spin_lock_irqsave(&fusion->mpt_pool_lock, flags);
 
 	if (!list_empty(&fusion->cmd_pool)) {
 		cmd = list_entry((&fusion->cmd_pool)->next,
@@ -173,7 +174,7 @@ struct megasas_cmd_fusion *megasas_get_cmd_fusion(struct megasas_instance
 		printk(KERN_ERR "megasas: Command pool (fusion) empty!\n");
 	}
 
-	spin_unlock_irqrestore(&fusion->cmd_pool_lock, flags);
+	spin_unlock_irqrestore(&fusion->mpt_pool_lock, flags);
 	return cmd;
 }
 
@@ -182,21 +183,47 @@ struct megasas_cmd_fusion *megasas_get_cmd_fusion(struct megasas_instance
  * @instance:		Adapter soft state
  * @cmd:		Command packet to be returned to free command pool
  */
-static inline void
-megasas_return_cmd_fusion(struct megasas_instance *instance,
-			  struct megasas_cmd_fusion *cmd)
+inline void megasas_return_cmd_fusion(struct megasas_instance *instance,
+	struct megasas_cmd_fusion *cmd)
 {
 	unsigned long flags;
 	struct fusion_context *fusion =
 		(struct fusion_context *)instance->ctrl_context;
 
-	spin_lock_irqsave(&fusion->cmd_pool_lock, flags);
+	spin_lock_irqsave(&fusion->mpt_pool_lock, flags);
 
 	cmd->scmd = NULL;
 	cmd->sync_cmd_idx = (u32)ULONG_MAX;
-	list_add_tail(&cmd->list, &fusion->cmd_pool);
+	list_add(&cmd->list, (&fusion->cmd_pool)->next);
 
-	spin_unlock_irqrestore(&fusion->cmd_pool_lock, flags);
+	spin_unlock_irqrestore(&fusion->mpt_pool_lock, flags);
+}
+
+/**
+ * megasas_return_mfi_mpt_pthr - Return a mfi and mpt to free command pool
+ * @instance:		Adapter soft state
+ * @cmd_mfi:		MFI Command packet to be returned to free command pool
+ * @cmd_mpt:		MPT Command packet to be returned to free command pool
+ */
+inline void megasas_return_mfi_mpt_pthr(struct megasas_instance *instance,
+		struct megasas_cmd *cmd_mfi,
+		struct megasas_cmd_fusion *cmd_fusion)
+{
+	unsigned long flags;
+
+	/*
+	 * TO DO: optimize this code and use only one lock instead of two
+	 * locks being used currently- mpt_pool_lock is acquired
+	 * inside mfi_pool_lock
+	 */
+	spin_lock_irqsave(&instance->mfi_pool_lock, flags);
+	megasas_return_cmd_fusion(instance, cmd_fusion);
+	if (atomic_read(&cmd_mfi->mfi_mpt_pthr) != MFI_MPT_ATTACHED)
+		dev_err(&instance->pdev->dev, "Possible bug from %s %d\n",
+			__func__, __LINE__);
+	atomic_set(&cmd_mfi->mfi_mpt_pthr, MFI_MPT_DETACHED);
+	__megasas_return_cmd(instance, cmd_mfi);
+	spin_unlock_irqrestore(&instance->mfi_pool_lock, flags);
 }
 
 /**
@@ -562,9 +589,11 @@ wait_and_poll(struct megasas_instance *instance, struct megasas_cmd *cmd,
 {
 	int i;
 	struct megasas_header *frame_hdr = &cmd->frame->hdr;
+	struct fusion_context *fusion;
 
 	u32 msecs = seconds * 1000;
 
+	fusion = instance->ctrl_context;
 	/*
 	 * Wait for cmd_status to change
 	 */
@@ -573,8 +602,12 @@ wait_and_poll(struct megasas_instance *instance, struct megasas_cmd *cmd,
 		msleep(20);
 	}
 
-	if (frame_hdr->cmd_status == 0xff)
+	if (frame_hdr->cmd_status == 0xff) {
+		if (fusion)
+			megasas_return_mfi_mpt_pthr(instance, cmd,
+				cmd->mpt_pthr_cmd_blocked);
 		return -ETIME;
+	}
 
 	return 0;
 }
@@ -777,14 +810,17 @@ megasas_get_ld_map_info(struct megasas_instance *instance)
 	dcmd->sgl.sge32[0].phys_addr = cpu_to_le32(ci_h);
 	dcmd->sgl.sge32[0].length = cpu_to_le32(size_map_info);
 
-	if (!megasas_issue_polled(instance, cmd))
-		ret = 0;
-	else {
-		printk(KERN_ERR "megasas: Get LD Map Info Failed\n");
-		ret = -1;
-	}
+	if (instance->ctrl_context && !instance->mask_interrupts)
+		ret = megasas_issue_blocked_cmd(instance, cmd,
+			MEGASAS_BLOCKED_CMD_TIMEOUT);
+	else
+		ret = megasas_issue_polled(instance, cmd);
 
-	megasas_return_cmd(instance, cmd);
+	if (instance->ctrl_context && cmd->mpt_pthr_cmd_blocked)
+		megasas_return_mfi_mpt_pthr(instance, cmd,
+			cmd->mpt_pthr_cmd_blocked);
+	else
+		megasas_return_cmd(instance, cmd);
 
 	return ret;
 }
@@ -2018,10 +2054,19 @@ complete_cmd_fusion(struct megasas_instance *instance, u32 MSIxIndex)
 			break;
 		case MEGASAS_MPI2_FUNCTION_PASSTHRU_IO_REQUEST: /*MFI command */
 			cmd_mfi = instance->cmd_list[cmd_fusion->sync_cmd_idx];
+
+			if (!cmd_mfi->mpt_pthr_cmd_blocked) {
+				if (megasas_dbg_lvl == 5)
+					dev_info(&instance->pdev->dev,
+						"freeing mfi/mpt pass-through "
+						"from %s %d\n",
+						 __func__, __LINE__);
+				megasas_return_mfi_mpt_pthr(instance, cmd_mfi,
+					cmd_fusion);
+			}
+
 			megasas_complete_cmd(instance, cmd_mfi, DID_OK);
 			cmd_fusion->flags = 0;
-			megasas_return_cmd_fusion(instance, cmd_fusion);
-
 			break;
 		}
 
@@ -2181,6 +2226,7 @@ build_mpt_mfi_pass_thru(struct megasas_instance *instance,
 	struct megasas_cmd_fusion *cmd;
 	struct fusion_context *fusion;
 	struct megasas_header *frame_hdr = &mfi_cmd->frame->hdr;
+	u32 opcode;
 
 	cmd = megasas_get_cmd_fusion(instance);
 	if (!cmd)
@@ -2188,9 +2234,20 @@ build_mpt_mfi_pass_thru(struct megasas_instance *instance,
 
 	/*  Save the smid. To be used for returning the cmd */
 	mfi_cmd->context.smid = cmd->index;
-
 	cmd->sync_cmd_idx = mfi_cmd->index;
 
+	/* Set this only for Blocked commands */
+	opcode = le32_to_cpu(mfi_cmd->frame->dcmd.opcode);
+	if ((opcode == MR_DCMD_LD_MAP_GET_INFO)
+		&& (mfi_cmd->frame->dcmd.mbox.b[1] == 1))
+		mfi_cmd->is_wait_event = 1;
+
+	if (opcode == MR_DCMD_CTRL_EVENT_WAIT)
+		mfi_cmd->is_wait_event = 1;
+
+	if (mfi_cmd->is_wait_event)
+		mfi_cmd->mpt_pthr_cmd_blocked = cmd;
+
 	/*
 	 * For cmds where the flag is set, store the flag and check
 	 * on completion. For cmds with this flag, don't call
@@ -2279,6 +2336,7 @@ megasas_issue_dcmd_fusion(struct megasas_instance *instance,
 		printk(KERN_ERR "Couldn't issue MFI pass thru cmd\n");
 		return;
 	}
+	atomic_set(&cmd->mfi_mpt_pthr, MFI_MPT_ATTACHED);
 	instance->instancet->fire_cmd(instance, req_desc->u.low,
 				      req_desc->u.high, instance->reg_set);
 }
@@ -2750,10 +2808,7 @@ int megasas_reset_fusion(struct Scsi_Host *shost, int iotimeout)
 					cmd_list[cmd_fusion->sync_cmd_idx];
 					if (cmd_mfi->frame->dcmd.opcode ==
 					    cpu_to_le32(MR_DCMD_LD_MAP_GET_INFO)) {
-						megasas_return_cmd(instance,
-								   cmd_mfi);
-						megasas_return_cmd_fusion(
-							instance, cmd_fusion);
+						megasas_return_mfi_mpt_pthr(instance, cmd_mfi, cmd_fusion);
 					} else  {
 						req_desc =
 						megasas_get_request_descriptor(
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.h b/drivers/scsi/megaraid/megaraid_sas_fusion.h
index 75844260fae9..0d183d521bdd 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.h
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.h
@@ -797,7 +797,7 @@ struct fusion_context {
 	struct megasas_cmd_fusion **cmd_list;
 	struct list_head cmd_pool;
 
-	spinlock_t cmd_pool_lock;
+	spinlock_t mpt_pool_lock;
 
 	dma_addr_t req_frames_desc_phys;
 	u8 *req_frames_desc;