be2iscsi: Fix mbox synchronization replacing spinlock with mutex

This is second part of actual fix for soft lockup.

All mbox cmds issued using BMBX and MCC are synchronized using mutex
mbox_lock instead of spin_lock. Used mutex_lock_interruptible where ever
possible.

Signed-off-by: Jitendra Bhivare <jitendra.bhivare@avagotech.com>
Reviewed-by: Shane Seymour <shane.seymour@hpe.com>
Reviewed-by: Hannes Reinicke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

4 files changed, 94 insertions, 88 deletions

diff --git a/drivers/scsi/be2iscsi/be.h b/drivers/scsi/be2iscsi/be.h
index a41c6432f444..ce0119b2111f 100644
--- a/drivers/scsi/be2iscsi/be.h
+++ b/drivers/scsi/be2iscsi/be.h
@@ -124,7 +124,7 @@ struct be_ctrl_info {
 	struct pci_dev *pdev;
 
 	/* Mbox used for cmd request/response */
-	spinlock_t mbox_lock;	/* For serializing mbox cmds to BE card */
+	struct mutex mbox_lock;	/* For serializing mbox cmds to BE card */
 	struct be_dma_mem mbox_mem;
 	/* Mbox mem is adjusted to align to 16 bytes. The allocated addr
 	 * is stored for freeing purpose */
diff --git a/drivers/scsi/be2iscsi/be_cmds.c b/drivers/scsi/be2iscsi/be_cmds.c
index cd50e3ce35a6..6fabdeda27f6 100644
--- a/drivers/scsi/be2iscsi/be_cmds.c
+++ b/drivers/scsi/be2iscsi/be_cmds.c
@@ -164,9 +164,9 @@ int beiscsi_mccq_compl(struct beiscsi_hba *phba,
 	}
 
 	/* Set MBX Tag state to Active */
-	spin_lock(&phba->ctrl.mbox_lock);
+	mutex_lock(&phba->ctrl.mbox_lock);
 	phba->ctrl.ptag_state[tag].tag_state = MCC_TAG_STATE_RUNNING;
-	spin_unlock(&phba->ctrl.mbox_lock);
+	mutex_unlock(&phba->ctrl.mbox_lock);
 
 	/* wait for the mccq completion */
 	rc = wait_event_interruptible_timeout(
@@ -178,9 +178,9 @@ int beiscsi_mccq_compl(struct beiscsi_hba *phba,
 	if (rc <= 0) {
 		struct be_dma_mem *tag_mem;
 		/* Set MBX Tag state to timeout */
-		spin_lock(&phba->ctrl.mbox_lock);
+		mutex_lock(&phba->ctrl.mbox_lock);
 		phba->ctrl.ptag_state[tag].tag_state = MCC_TAG_STATE_TIMEOUT;
-		spin_unlock(&phba->ctrl.mbox_lock);
+		mutex_unlock(&phba->ctrl.mbox_lock);
 
 		/* Store resource addr to be freed later */
 		tag_mem = &phba->ctrl.ptag_state[tag].tag_mem_state;
@@ -199,9 +199,9 @@ int beiscsi_mccq_compl(struct beiscsi_hba *phba,
 	} else {
 		rc = 0;
 		/* Set MBX Tag state to completed */
-		spin_lock(&phba->ctrl.mbox_lock);
+		mutex_lock(&phba->ctrl.mbox_lock);
 		phba->ctrl.ptag_state[tag].tag_state = MCC_TAG_STATE_COMPLETED;
-		spin_unlock(&phba->ctrl.mbox_lock);
+		mutex_unlock(&phba->ctrl.mbox_lock);
 	}
 
 	mcc_tag_response = phba->ctrl.mcc_numtag[tag];
@@ -390,9 +390,9 @@ int be_mcc_compl_process_isr(struct be_ctrl_info *ctrl,
 					    tag_mem->va, tag_mem->dma);
 
 		/* Change tag state */
-		spin_lock(&phba->ctrl.mbox_lock);
+		mutex_lock(&phba->ctrl.mbox_lock);
 		ctrl->ptag_state[tag].tag_state = MCC_TAG_STATE_COMPLETED;
-		spin_unlock(&phba->ctrl.mbox_lock);
+		mutex_unlock(&phba->ctrl.mbox_lock);
 
 		/* Free MCC Tag */
 		free_mcc_tag(ctrl, tag);
@@ -831,7 +831,7 @@ int beiscsi_cmd_eq_create(struct be_ctrl_info *ctrl,
 	struct be_dma_mem *q_mem = &eq->dma_mem;
 	int status;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	memset(wrb, 0, sizeof(*wrb));
 
 	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
@@ -858,7 +858,7 @@ int beiscsi_cmd_eq_create(struct be_ctrl_info *ctrl,
 		eq->id = le16_to_cpu(resp->eq_id);
 		eq->created = true;
 	}
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return status;
 }
 
@@ -879,7 +879,7 @@ int be_cmd_fw_initialize(struct be_ctrl_info *ctrl)
 	int status;
 	u8 *endian_check;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	memset(wrb, 0, sizeof(*wrb));
 
 	endian_check = (u8 *) wrb;
@@ -898,7 +898,7 @@ int be_cmd_fw_initialize(struct be_ctrl_info *ctrl)
 		beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_INIT,
 			    "BC_%d : be_cmd_fw_initialize Failed\n");
 
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return status;
 }
 
@@ -919,7 +919,7 @@ int be_cmd_fw_uninit(struct be_ctrl_info *ctrl)
 	int status;
 	u8 *endian_check;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	memset(wrb, 0, sizeof(*wrb));
 
 	endian_check = (u8 *) wrb;
@@ -939,7 +939,7 @@ int be_cmd_fw_uninit(struct be_ctrl_info *ctrl)
 		beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_INIT,
 			    "BC_%d : be_cmd_fw_uninit Failed\n");
 
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return status;
 }
 
@@ -955,7 +955,7 @@ int beiscsi_cmd_cq_create(struct be_ctrl_info *ctrl,
 	void *ctxt = &req->context;
 	int status;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	memset(wrb, 0, sizeof(*wrb));
 
 	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
@@ -1005,7 +1005,7 @@ int beiscsi_cmd_cq_create(struct be_ctrl_info *ctrl,
 			    "BC_%d : In be_cmd_cq_create, status=ox%08x\n",
 			    status);
 
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 
 	return status;
 }
@@ -1029,7 +1029,7 @@ int beiscsi_cmd_mccq_create(struct beiscsi_hba *phba,
 	void *ctxt;
 	int status;
 
-	spin_lock(&phba->ctrl.mbox_lock);
+	mutex_lock(&phba->ctrl.mbox_lock);
 	ctrl = &phba->ctrl;
 	wrb = wrb_from_mbox(&ctrl->mbox_mem);
 	memset(wrb, 0, sizeof(*wrb));
@@ -1060,7 +1060,7 @@ int beiscsi_cmd_mccq_create(struct beiscsi_hba *phba,
 		mccq->id = le16_to_cpu(resp->id);
 		mccq->created = true;
 	}
-	spin_unlock(&phba->ctrl.mbox_lock);
+	mutex_unlock(&phba->ctrl.mbox_lock);
 
 	return status;
 }
@@ -1078,7 +1078,7 @@ int beiscsi_cmd_q_destroy(struct be_ctrl_info *ctrl, struct be_queue_info *q,
 		    "BC_%d : In beiscsi_cmd_q_destroy "
 		    "queue_type : %d\n", queue_type);
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	memset(wrb, 0, sizeof(*wrb));
 	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
 
@@ -1108,7 +1108,7 @@ int beiscsi_cmd_q_destroy(struct be_ctrl_info *ctrl, struct be_queue_info *q,
 		opcode = OPCODE_COMMON_ISCSI_CFG_REMOVE_SGL_PAGES;
 		break;
 	default:
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		BUG();
 		return -ENXIO;
 	}
@@ -1118,7 +1118,7 @@ int beiscsi_cmd_q_destroy(struct be_ctrl_info *ctrl, struct be_queue_info *q,
 
 	status = be_mbox_notify(ctrl);
 
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return status;
 }
 
@@ -1153,7 +1153,7 @@ int be_cmd_create_default_pdu_queue(struct be_ctrl_info *ctrl,
 	void *ctxt = &req->context;
 	int status;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	memset(wrb, 0, sizeof(*wrb));
 
 	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
@@ -1225,7 +1225,7 @@ int be_cmd_create_default_pdu_queue(struct be_ctrl_info *ctrl,
 			defq_ring->doorbell_offset = resp->doorbell_offset;
 		}
 	}
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 
 	return status;
 }
@@ -1253,7 +1253,7 @@ int be_cmd_wrbq_create(struct be_ctrl_info *ctrl,
 	struct beiscsi_hba *phba = pci_get_drvdata(ctrl->pdev);
 	int status;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	memset(wrb, 0, sizeof(*wrb));
 
 	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
@@ -1284,7 +1284,7 @@ int be_cmd_wrbq_create(struct be_ctrl_info *ctrl,
 			pwrb_context->doorbell_offset = resp->doorbell_offset;
 		}
 	}
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return status;
 }
 
@@ -1295,7 +1295,7 @@ int be_cmd_iscsi_post_template_hdr(struct be_ctrl_info *ctrl,
 	struct be_post_template_pages_req *req = embedded_payload(wrb);
 	int status;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 
 	memset(wrb, 0, sizeof(*wrb));
 	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
@@ -1308,7 +1308,7 @@ int be_cmd_iscsi_post_template_hdr(struct be_ctrl_info *ctrl,
 	be_cmd_page_addrs_prepare(req->pages, ARRAY_SIZE(req->pages), q_mem);
 
 	status = be_mbox_notify(ctrl);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return status;
 }
 
@@ -1318,7 +1318,7 @@ int be_cmd_iscsi_remove_template_hdr(struct be_ctrl_info *ctrl)
 	struct be_remove_template_pages_req *req = embedded_payload(wrb);
 	int status;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 
 	memset(wrb, 0, sizeof(*wrb));
 	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
@@ -1329,7 +1329,7 @@ int be_cmd_iscsi_remove_template_hdr(struct be_ctrl_info *ctrl)
 	req->type = BEISCSI_TEMPLATE_HDR_TYPE_ISCSI;
 
 	status = be_mbox_notify(ctrl);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return status;
 }
 
@@ -1348,7 +1348,7 @@ int be_cmd_iscsi_post_sgl_pages(struct be_ctrl_info *ctrl,
 	if (num_pages == 0xff)
 		num_pages = 1;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	do {
 		memset(wrb, 0, sizeof(*wrb));
 		be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
@@ -1377,7 +1377,7 @@ int be_cmd_iscsi_post_sgl_pages(struct be_ctrl_info *ctrl,
 		}
 	} while (num_pages > 0);
 error:
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	if (status != 0)
 		beiscsi_cmd_q_destroy(ctrl, NULL, QTYPE_SGL);
 	return status;
@@ -1390,7 +1390,7 @@ int beiscsi_cmd_reset_function(struct beiscsi_hba  *phba)
 	struct be_post_sgl_pages_req *req = embedded_payload(wrb);
 	int status;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 
 	req = embedded_payload(wrb);
 	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
@@ -1398,7 +1398,7 @@ int beiscsi_cmd_reset_function(struct beiscsi_hba  *phba)
 			   OPCODE_COMMON_FUNCTION_RESET, sizeof(*req));
 	status = be_mbox_notify_wait(phba);
 
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return status;
 }
 
@@ -1420,10 +1420,11 @@ int be_cmd_set_vlan(struct beiscsi_hba *phba,
 	struct be_cmd_set_vlan_req *req;
 	struct be_ctrl_info *ctrl = &phba->ctrl;
 
-	spin_lock(&ctrl->mbox_lock);
+	if (mutex_lock_interruptible(&ctrl->mbox_lock))
+		return 0;
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 
@@ -1439,7 +1440,7 @@ int be_cmd_set_vlan(struct beiscsi_hba *phba,
 	req->vlan_priority = vlan_tag;
 
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 
 	return tag;
 }
diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index cb9072a841be..ca3dc4bfc4cf 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -727,7 +727,7 @@ static int be_ctrl_init(struct beiscsi_hba *phba, struct pci_dev *pdev)
 	mbox_mem_align->va = PTR_ALIGN(mbox_mem_alloc->va, 16);
 	mbox_mem_align->dma = PTR_ALIGN(mbox_mem_alloc->dma, 16);
 	memset(mbox_mem_align->va, 0, sizeof(struct be_mcc_mailbox));
-	spin_lock_init(&ctrl->mbox_lock);
+	mutex_init(&ctrl->mbox_lock);
 	spin_lock_init(&phba->ctrl.mcc_lock);
 	spin_lock_init(&phba->ctrl.mcc_cq_lock);
 
diff --git a/drivers/scsi/be2iscsi/be_mgmt.c b/drivers/scsi/be2iscsi/be_mgmt.c
index 7b54b23e756e..a41013ed742e 100644
--- a/drivers/scsi/be2iscsi/be_mgmt.c
+++ b/drivers/scsi/be2iscsi/be_mgmt.c
@@ -164,10 +164,10 @@ int be_cmd_modify_eq_delay(struct beiscsi_hba *phba,
 	unsigned int tag = 0;
 	int i;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 
@@ -188,7 +188,7 @@ int be_cmd_modify_eq_delay(struct beiscsi_hba *phba,
 	}
 
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return tag;
 }
 
@@ -215,10 +215,10 @@ unsigned int mgmt_reopen_session(struct beiscsi_hba *phba,
 		    BEISCSI_LOG_CONFIG | BEISCSI_LOG_MBOX,
 		    "BG_%d : In bescsi_get_boot_target\n");
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 
@@ -235,7 +235,7 @@ unsigned int mgmt_reopen_session(struct beiscsi_hba *phba,
 	req->session_handle = sess_handle;
 
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return tag;
 }
 
@@ -250,10 +250,10 @@ unsigned int mgmt_get_boot_target(struct beiscsi_hba *phba)
 		    BEISCSI_LOG_CONFIG | BEISCSI_LOG_MBOX,
 		    "BG_%d : In bescsi_get_boot_target\n");
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 
@@ -266,7 +266,7 @@ unsigned int mgmt_get_boot_target(struct beiscsi_hba *phba)
 			   sizeof(struct be_cmd_get_boot_target_resp));
 
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return tag;
 }
 
@@ -285,10 +285,10 @@ unsigned int mgmt_get_session_info(struct beiscsi_hba *phba,
 		    BEISCSI_LOG_CONFIG | BEISCSI_LOG_MBOX,
 		    "BG_%d : In beiscsi_get_session_info\n");
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 
@@ -311,7 +311,7 @@ unsigned int mgmt_get_session_info(struct beiscsi_hba *phba,
 	sge->len = cpu_to_le32(nonemb_cmd->size);
 
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return tag;
 }
 
@@ -334,7 +334,7 @@ int mgmt_get_fw_config(struct be_ctrl_info *ctrl,
 	struct be_fw_cfg *req = embedded_payload(wrb);
 	int status = 0;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	memset(wrb, 0, sizeof(*wrb));
 
 	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
@@ -415,7 +415,7 @@ int mgmt_get_fw_config(struct be_ctrl_info *ctrl,
 		status = -EINVAL;
 	}
 
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return status;
 }
 
@@ -440,7 +440,7 @@ int mgmt_check_supported_fw(struct be_ctrl_info *ctrl,
 	nonemb_cmd.size = sizeof(struct be_mgmt_controller_attributes);
 	req = nonemb_cmd.va;
 	memset(req, 0, sizeof(*req));
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	memset(wrb, 0, sizeof(*wrb));
 	be_wrb_hdr_prepare(wrb, sizeof(*req), false, 1);
 	be_cmd_hdr_prepare(&req->hdr, CMD_SUBSYSTEM_COMMON,
@@ -470,7 +470,7 @@ int mgmt_check_supported_fw(struct be_ctrl_info *ctrl,
 	} else
 		beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_INIT,
 			    "BG_%d :  Failed in mgmt_check_supported_fw\n");
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	if (nonemb_cmd.va)
 		pci_free_consistent(ctrl->pdev, nonemb_cmd.size,
 				    nonemb_cmd.va, nonemb_cmd.dma);
@@ -501,8 +501,9 @@ unsigned int mgmt_vendor_specific_fw_cmd(struct be_ctrl_info *ctrl,
 	req->region = region;
 	req->sector = sector;
 	req->offset = offset;
-	spin_lock(&ctrl->mbox_lock);
 
+	if (mutex_lock_interruptible(&ctrl->mbox_lock))
+		return 0;
 	switch (bsg_req->rqst_data.h_vendor.vendor_cmd[0]) {
 	case BEISCSI_WRITE_FLASH:
 		offset = sector * sector_size + offset;
@@ -521,13 +522,13 @@ unsigned int mgmt_vendor_specific_fw_cmd(struct be_ctrl_info *ctrl,
 			    "BG_%d : Unsupported cmd = 0x%x\n\n",
 			    bsg_req->rqst_data.h_vendor.vendor_cmd[0]);
 
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return -ENOSYS;
 	}
 
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 
@@ -542,7 +543,7 @@ unsigned int mgmt_vendor_specific_fw_cmd(struct be_ctrl_info *ctrl,
 
 	be_mcc_notify(phba);
 
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return tag;
 }
 
@@ -562,7 +563,7 @@ int mgmt_epfw_cleanup(struct beiscsi_hba *phba, unsigned short ulp_num)
 	struct iscsi_cleanup_req *req = embedded_payload(wrb);
 	int status = 0;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 
 	be_wrb_hdr_prepare(wrb, sizeof(*req), true, 0);
 	be_cmd_hdr_prepare(&req->hdr, CMD_SUBSYSTEM_ISCSI,
@@ -576,7 +577,7 @@ int mgmt_epfw_cleanup(struct beiscsi_hba *phba, unsigned short ulp_num)
 	if (status)
 		beiscsi_log(phba, KERN_WARNING, BEISCSI_LOG_INIT,
 			    "BG_%d : mgmt_epfw_cleanup , FAILED\n");
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return status;
 }
 
@@ -592,10 +593,10 @@ unsigned int  mgmt_invalidate_icds(struct beiscsi_hba *phba,
 	struct invalidate_commands_params_in *req;
 	unsigned int i, tag = 0;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 
@@ -622,7 +623,7 @@ unsigned int  mgmt_invalidate_icds(struct beiscsi_hba *phba,
 	sge->len = cpu_to_le32(nonemb_cmd->size);
 
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return tag;
 }
 
@@ -637,10 +638,10 @@ unsigned int mgmt_invalidate_connection(struct beiscsi_hba *phba,
 	struct iscsi_invalidate_connection_params_in *req;
 	unsigned int tag = 0;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 	wrb = wrb_from_mccq(phba);
@@ -659,7 +660,7 @@ unsigned int mgmt_invalidate_connection(struct beiscsi_hba *phba,
 		req->cleanup_type = CMD_ISCSI_CONNECTION_INVALIDATE;
 	req->save_cfg = savecfg_flag;
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return tag;
 }
 
@@ -671,10 +672,10 @@ unsigned int mgmt_upload_connection(struct beiscsi_hba *phba,
 	struct tcp_upload_params_in *req;
 	unsigned int tag = 0;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 	wrb = wrb_from_mccq(phba);
@@ -687,7 +688,7 @@ unsigned int mgmt_upload_connection(struct beiscsi_hba *phba,
 	req->id = (unsigned short)cid;
 	req->upload_type = (unsigned char)upload_flag;
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return tag;
 }
 
@@ -732,10 +733,11 @@ int mgmt_open_connection(struct beiscsi_hba *phba,
 
 	ptemplate_address = &template_address;
 	ISCSI_GET_PDU_TEMPLATE_ADDRESS(phba, ptemplate_address);
-	spin_lock(&ctrl->mbox_lock);
+	if (mutex_lock_interruptible(&ctrl->mbox_lock))
+		return 0;
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 	wrb = wrb_from_mccq(phba);
@@ -773,7 +775,7 @@ int mgmt_open_connection(struct beiscsi_hba *phba,
 		beiscsi_log(phba, KERN_ERR, BEISCSI_LOG_CONFIG,
 			    "BG_%d : unknown addr family %d\n",
 			    dst_addr->sa_family);
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		free_mcc_tag(&phba->ctrl, tag);
 		return -EINVAL;
 
@@ -802,7 +804,7 @@ int mgmt_open_connection(struct beiscsi_hba *phba,
 	}
 
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return tag;
 }
 
@@ -815,10 +817,11 @@ unsigned int mgmt_get_all_if_id(struct beiscsi_hba *phba)
 	unsigned int tag;
 	int status = 0;
 
-	spin_lock(&ctrl->mbox_lock);
+	if (mutex_lock_interruptible(&ctrl->mbox_lock))
+		return -EINTR;
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return -ENOMEM;
 	}
 
@@ -831,7 +834,7 @@ unsigned int mgmt_get_all_if_id(struct beiscsi_hba *phba)
 			   OPCODE_COMMON_ISCSI_NTWK_GET_ALL_IF_ID,
 			   sizeof(*req));
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 
 	status = beiscsi_mccq_compl(phba, tag, &wrb, NULL);
 	if (status) {
@@ -864,10 +867,10 @@ static int mgmt_exec_nonemb_cmd(struct beiscsi_hba *phba,
 	unsigned int tag;
 	int rc = 0;
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		rc = -ENOMEM;
 		goto free_cmd;
 	}
@@ -882,7 +885,7 @@ static int mgmt_exec_nonemb_cmd(struct beiscsi_hba *phba,
 	sge->len = cpu_to_le32(nonemb_cmd->size);
 
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 
 	rc = beiscsi_mccq_compl(phba, tag, NULL, nonemb_cmd);
 
@@ -1262,10 +1265,11 @@ unsigned int be_cmd_get_initname(struct beiscsi_hba *phba)
 	struct be_cmd_hba_name *req;
 	struct be_ctrl_info *ctrl = &phba->ctrl;
 
-	spin_lock(&ctrl->mbox_lock);
+	if (mutex_lock_interruptible(&ctrl->mbox_lock))
+		return 0;
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 
@@ -1278,7 +1282,7 @@ unsigned int be_cmd_get_initname(struct beiscsi_hba *phba)
 			sizeof(*req));
 
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return tag;
 }
 
@@ -1289,10 +1293,11 @@ unsigned int be_cmd_get_port_speed(struct beiscsi_hba *phba)
 	struct be_cmd_ntwk_link_status_req *req;
 	struct be_ctrl_info *ctrl = &phba->ctrl;
 
-	spin_lock(&ctrl->mbox_lock);
+	if (mutex_lock_interruptible(&ctrl->mbox_lock))
+		return 0;
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		return tag;
 	}
 
@@ -1305,7 +1310,7 @@ unsigned int be_cmd_get_port_speed(struct beiscsi_hba *phba)
 			sizeof(*req));
 
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 	return tag;
 }
 
@@ -1761,10 +1766,10 @@ int beiscsi_logout_fw_sess(struct beiscsi_hba *phba,
 		    BEISCSI_LOG_CONFIG | BEISCSI_LOG_MBOX,
 		    "BG_%d : In bescsi_logout_fwboot_sess\n");
 
-	spin_lock(&ctrl->mbox_lock);
+	mutex_lock(&ctrl->mbox_lock);
 	tag = alloc_mcc_tag(phba);
 	if (!tag) {
-		spin_unlock(&ctrl->mbox_lock);
+		mutex_unlock(&ctrl->mbox_lock);
 		beiscsi_log(phba, KERN_INFO,
 			    BEISCSI_LOG_CONFIG | BEISCSI_LOG_MBOX,
 			    "BG_%d : MBX Tag Failure\n");
@@ -1782,7 +1787,7 @@ int beiscsi_logout_fw_sess(struct beiscsi_hba *phba,
 	/* Set the session handle */
 	req->session_handle = fw_sess_handle;
 	be_mcc_notify(phba);
-	spin_unlock(&ctrl->mbox_lock);
+	mutex_unlock(&ctrl->mbox_lock);
 
 	rc = beiscsi_mccq_compl(phba, tag, &wrb, NULL);
 	if (rc) {