megaraid_sas: complete outstanding IOCTLs before killing adapter

Driver calls megasas_complete_cmd() to call wake_up() for each MFI frame
that was issued through the ioctl() interface prior to the kill adapter.
This ensures userspace ioctl() system calls issued just before a kill
adapter don't get stuck in wait state and IOCTLs are returned to
the application.

Cc: <stable@vger.kernel.org>
Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Signed-off-by: Chaitra Basappa <chaitra.basappa@avagotech.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>

drivers/scsi/megaraid/megaraid_sas_base.c

@@ -1692,22 +1692,66 @@ static int megasas_slave_alloc(struct scsi_device *sdev)
 	return 0;
 }
 
+/*
+* megasas_complete_outstanding_ioctls - Complete outstanding ioctls after a
+*                                       kill adapter
+* @instance:				Adapter soft state
+*
+*/
+void megasas_complete_outstanding_ioctls(struct megasas_instance *instance)
+{
+	int i;
+	struct megasas_cmd *cmd_mfi;
+	struct megasas_cmd_fusion *cmd_fusion;
+	struct fusion_context *fusion = instance->ctrl_context;
+
+	/* Find all outstanding ioctls */
+	if (fusion) {
+		for (i = 0; i < instance->max_fw_cmds; i++) {
+			cmd_fusion = fusion->cmd_list[i];
+			if (cmd_fusion->sync_cmd_idx != (u32)ULONG_MAX) {
+				cmd_mfi = instance->cmd_list[cmd_fusion->sync_cmd_idx];
+				if (cmd_mfi->sync_cmd &&
+					cmd_mfi->frame->hdr.cmd != MFI_CMD_ABORT)
+					megasas_complete_cmd(instance,
+							     cmd_mfi, DID_OK);
+			}
+		}
+	} else {
+		for (i = 0; i < instance->max_fw_cmds; i++) {
+			cmd_mfi = instance->cmd_list[i];
+			if (cmd_mfi->sync_cmd && cmd_mfi->frame->hdr.cmd !=
+				MFI_CMD_ABORT)
+				megasas_complete_cmd(instance, cmd_mfi, DID_OK);
+		}
+	}
+}
+
+
 void megaraid_sas_kill_hba(struct megasas_instance *instance)
 {
+	/* Set critical error to block I/O & ioctls in case caller didn't */
+	instance->adprecovery = MEGASAS_HW_CRITICAL_ERROR;
+	/* Wait 1 second to ensure IO or ioctls in build have posted */
+	msleep(1000);
 	if ((instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0073SKINNY) ||
 		(instance->pdev->device == PCI_DEVICE_ID_LSI_SAS0071SKINNY) ||
 		(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)) {
-		writel(MFI_STOP_ADP, &instance->reg_set->doorbell);
+		writel(MFI_STOP_ADP,
+			&instance->reg_set->doorbell);
 		/* Flush */
 		readl(&instance->reg_set->doorbell);
 		if (instance->mpio && instance->requestorId)
 			memset(instance->ld_ids, 0xff, MEGASAS_MAX_LD_IDS);
 	} else {
-		writel(MFI_STOP_ADP, &instance->reg_set->inbound_doorbell);
+		writel(MFI_STOP_ADP,
+			&instance->reg_set->inbound_doorbell);
 	}
+	/* Complete outstanding ioctls when adapter is killed */
+	megasas_complete_outstanding_ioctls(instance);
 }
 
  /**
@@ -3031,10 +3075,9 @@ megasas_issue_pending_cmds_again(struct megasas_instance *instance)
 					"was tried multiple times during reset."
 					"Shutting down the HBA\n",
 					cmd, cmd->scmd, cmd->sync_cmd);
+				instance->instancet->disable_intr(instance);
+				atomic_set(&instance->fw_reset_no_pci_access, 1);
 				megaraid_sas_kill_hba(instance);
-
-				instance->adprecovery =
-						MEGASAS_HW_CRITICAL_ERROR;
 				return;
 			}
 		}
@@ -3168,8 +3211,8 @@ process_fw_state_change_wq(struct work_struct *work)
 		if (megasas_transition_to_ready(instance, 1)) {
 			printk(KERN_NOTICE "megaraid_sas:adapter not ready\n");
 
+			atomic_set(&instance->fw_reset_no_pci_access, 1);
 			megaraid_sas_kill_hba(instance);
-			instance->adprecovery	= MEGASAS_HW_CRITICAL_ERROR;
 			return ;
 		}
 

drivers/scsi/megaraid/megaraid_sas_fusion.c

@@ -2631,7 +2631,6 @@ int megasas_reset_fusion(struct Scsi_Host *shost, int iotimeout)
 				instance->host->host_no);
 			megaraid_sas_kill_hba(instance);
 			instance->skip_heartbeat_timer_del = 1;
-			instance->adprecovery = MEGASAS_HW_CRITICAL_ERROR;
 			retval = FAILED;
 			goto out;
 		}
@@ -2827,8 +2826,6 @@ int megasas_reset_fusion(struct Scsi_Host *shost, int iotimeout)
 				dev_info(&instance->pdev->dev,
 					"Failed from %s %d\n",
 					__func__, __LINE__);
-				instance->adprecovery =
-					MEGASAS_HW_CRITICAL_ERROR;
 				megaraid_sas_kill_hba(instance);
 				retval = FAILED;
 			}
@@ -2877,7 +2874,6 @@ int megasas_reset_fusion(struct Scsi_Host *shost, int iotimeout)
 		       "adapter scsi%d.\n", instance->host->host_no);
 		megaraid_sas_kill_hba(instance);
 		instance->skip_heartbeat_timer_del = 1;
-		instance->adprecovery = MEGASAS_HW_CRITICAL_ERROR;
 		retval = FAILED;
 	} else {
 		/* For VF: Restart HB timer if we didn't OCR */