[PATCH 4/6] megaraid_sas: catch errors from megasas_get_map_info()

[Hannes Reinecke <hare@suse.de>]

megasas_get_map_info() might fail, after which it'll be
pointless to call megasas_sync_map_info().
So update megasas_get_map_info() to correctly handle errors
and call megasas_sync_map_info() only if no error occurred.

Cc: Kashyap Desai <kashyap.desai@lsi.com>
Cc: Adam Radford <aradford@gmail.com>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
 drivers/scsi/megaraid/megaraid_sas_base.c   |  5 ++--
 drivers/scsi/megaraid/megaraid_sas_fusion.c | 41 ++++++++++++++++-------------
 2 files changed, 26 insertions(+), 20 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 95d4e5c..d17a097 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -4689,8 +4689,9 @@ megasas_resume(struct pci_dev *pdev)
 			megasas_free_cmds_fusion(instance);
 			goto fail_init_mfi;
 		}
-		if (!megasas_get_map_info(instance))
-			megasas_sync_map_info(instance);
+		if (megasas_get_map_info(instance) < 0)
+			goto fail_init_mfi;
+		megasas_sync_map_info(instance);
 	}
 	break;
 	default:
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index 5c30f9d..be6de80 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -773,15 +773,16 @@ u8
 megasas_get_map_info(struct megasas_instance *instance)
 {
 	struct fusion_context *fusion = instance->ctrl_context;
+	int rc;
 
 	fusion->fast_path_io = 0;
-	if (!megasas_get_ld_map_info(instance)) {
-		if (MR_ValidateMapInfo(instance)) {
-			fusion->fast_path_io = 1;
-			return 0;
-		}
-	}
-	return 1;
+	rc = megasas_get_ld_map_info(instance);
+	if (rc < 0)
+		return rc;
+
+	if (MR_ValidateMapInfo(instance))
+		fusion->fast_path_io = 1;
+	return 0;
 }
 
 /*
@@ -807,6 +808,14 @@ megasas_sync_map_info(struct megasas_instance *instance)
 	dma_addr_t ci_h = 0;
 	u32 size_map_info;
 
+	fusion = instance->ctrl_context;
+	if (!fusion)
+		return -ENXIO;
+
+	if (!fusion->fast_path_io)
+		return 0;
+
+
 	cmd = megasas_get_cmd(instance);
 
 	if (!cmd) {
@@ -815,13 +824,6 @@ megasas_sync_map_info(struct megasas_instance *instance)
 		return -ENOMEM;
 	}
 
-	fusion = instance->ctrl_context;
-
-	if (!fusion) {
-		megasas_return_cmd(instance, cmd);
-		return 1;
-	}
-
 	map = fusion->ld_map[instance->map_id & 1];
 
 	num_lds = le32_to_cpu(map->raidMap.ldCount);
@@ -1030,8 +1032,10 @@ megasas_init_adapter_fusion(struct megasas_instance *instance)
 		}
 	}
 
-	if (!megasas_get_map_info(instance))
-		megasas_sync_map_info(instance);
+	if (megasas_get_map_info(instance) < 0)
+		goto fail_map_info;
+
+	megasas_sync_map_info(instance);
 
 	return 0;
 
@@ -2457,8 +2461,9 @@ int megasas_reset_fusion(struct Scsi_Host *shost)
 			       sizeof(struct LD_LOAD_BALANCE_INFO)
 			       *MAX_LOGICAL_DRIVES);
 
-			if (!megasas_get_map_info(instance))
-				megasas_sync_map_info(instance);
+			if (megasas_get_map_info(instance) < 0)
+				break;
+			megasas_sync_map_info(instance);
 
 			/* Adapter reset completed successfully */
 			printk(KERN_WARNING "megaraid_sas: Reset "
-- 
1.7.12.4