iwlwifi: add debug print for parsing firmware TLV

When parsing TLV during loading firmware, if encounter any TLV error,
log the error message to help debugging.
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -1806,12 +1806,21 @@ static int iwlagn_load_firmware(struct iwl_priv *priv,
 	const u8 *data;
 	int wanted_alternative = iwlagn_wanted_ucode_alternative, tmp;
 	u64 alternatives;
+	u32 tlv_len;
+	enum iwl_ucode_tlv_type tlv_type;
+	const u8 *tlv_data;
+	int ret = 0;
 
-	if (len < sizeof(*ucode))
+	if (len < sizeof(*ucode)) {
+		IWL_ERR(priv, "uCode has invalid length: %zd\n", len);
 		return -EINVAL;
+	}
 
-	if (ucode->magic != cpu_to_le32(IWL_TLV_UCODE_MAGIC))
+	if (ucode->magic != cpu_to_le32(IWL_TLV_UCODE_MAGIC)) {
+		IWL_ERR(priv, "invalid uCode magic: 0X%x\n",
+			le32_to_cpu(ucode->magic));
 		return -EINVAL;
+	}
 
 	/*
 	 * Check which alternatives are present, and "downgrade"
@@ -1836,11 +1845,9 @@ static int iwlagn_load_firmware(struct iwl_priv *priv,
 
 	len -= sizeof(*ucode);
 
-	while (len >= sizeof(*tlv)) {
-		u32 tlv_len;
-		enum iwl_ucode_tlv_type tlv_type;
+	while (len >= sizeof(*tlv) && !ret) {
 		u16 tlv_alt;
-		const u8 *tlv_data;
+		u32 fixed_tlv_size = 4;
 
 		len -= sizeof(*tlv);
 		tlv = (void *)data;
@@ -1850,8 +1857,11 @@ static int iwlagn_load_firmware(struct iwl_priv *priv,
 		tlv_alt = le16_to_cpu(tlv->alternative);
 		tlv_data = tlv->data;
 
-		if (len < tlv_len)
+		if (len < tlv_len) {
+			IWL_ERR(priv, "invalid TLV len: %zd/%u\n",
+				len, tlv_len);
 			return -EINVAL;
+		}
 		len -= ALIGN(tlv_len, 4);
 		data += sizeof(*tlv) + ALIGN(tlv_len, 4);
 
@@ -1885,56 +1895,71 @@ static int iwlagn_load_firmware(struct iwl_priv *priv,
 			pieces->boot_size = tlv_len;
 			break;
 		case IWL_UCODE_TLV_PROBE_MAX_LEN:
-			if (tlv_len != 4)
-				return -EINVAL;
+			if (tlv_len != fixed_tlv_size)
+				ret = -EINVAL;
+			else
 				capa->max_probe_length =
 					le32_to_cpup((__le32 *)tlv_data);
 			break;
 		case IWL_UCODE_TLV_INIT_EVTLOG_PTR:
-			if (tlv_len != 4)
-				return -EINVAL;
+			if (tlv_len != fixed_tlv_size)
+				ret = -EINVAL;
+			else
 				pieces->init_evtlog_ptr =
 					le32_to_cpup((__le32 *)tlv_data);
 			break;
 		case IWL_UCODE_TLV_INIT_EVTLOG_SIZE:
-			if (tlv_len != 4)
-				return -EINVAL;
+			if (tlv_len != fixed_tlv_size)
+				ret = -EINVAL;
+			else
 				pieces->init_evtlog_size =
 					le32_to_cpup((__le32 *)tlv_data);
 			break;
 		case IWL_UCODE_TLV_INIT_ERRLOG_PTR:
-			if (tlv_len != 4)
-				return -EINVAL;
+			if (tlv_len != fixed_tlv_size)
+				ret = -EINVAL;
+			else
 				pieces->init_errlog_ptr =
 					le32_to_cpup((__le32 *)tlv_data);
 			break;
 		case IWL_UCODE_TLV_RUNT_EVTLOG_PTR:
-			if (tlv_len != 4)
-				return -EINVAL;
+			if (tlv_len != fixed_tlv_size)
+				ret = -EINVAL;
+			else
 				pieces->inst_evtlog_ptr =
 					le32_to_cpup((__le32 *)tlv_data);
 			break;
 		case IWL_UCODE_TLV_RUNT_EVTLOG_SIZE:
-			if (tlv_len != 4)
-				return -EINVAL;
+			if (tlv_len != fixed_tlv_size)
+				ret = -EINVAL;
+			else
 				pieces->inst_evtlog_size =
 					le32_to_cpup((__le32 *)tlv_data);
 			break;
 		case IWL_UCODE_TLV_RUNT_ERRLOG_PTR:
-			if (tlv_len != 4)
-				return -EINVAL;
+			if (tlv_len != fixed_tlv_size)
+				ret = -EINVAL;
+			else
 				pieces->inst_errlog_ptr =
 					le32_to_cpup((__le32 *)tlv_data);
 			break;
 		default:
+			IWL_WARN(priv, "unknown TLV: %d\n", tlv_type);
 			break;
 		}
 	}
 
-	if (len)
-		return -EINVAL;
+	if (len) {
+		IWL_ERR(priv, "invalid TLV after parsing: %zd\n", len);
+		iwl_print_hex_dump(priv, IWL_DL_FW, (u8 *)data, len);
+		ret = -EINVAL;
+	} else if (ret) {
+		IWL_ERR(priv, "TLV %d has invalid size: %u\n",
+			tlv_type, tlv_len);
+		iwl_print_hex_dump(priv, IWL_DL_FW, (u8 *)tlv_data, tlv_len);
+	}
 
-	return 0;
+	return ret;
 }
 
 /**