[PATCH] fwts: fix acpi table access on failed load

[Jeremy Kerr]

Currently, we may try and access tables even if the load has failed;
after a failed load, acpi_tables_loaded will be
ACPI_TABLES_LOADED_FAILED. The check in fwts_acpi_find_table is just:

	if (acpi_tables_loaded == ACPI_TABLES_LOADED_FAILED)
		return FWTS_ERROR;

- which means we assume the tables have been loaded, so we begin to
parse the tables array.

This change introduces a check if the load has failed.

Signed-off-by: Jeremy Kerr <jk at ozlabs.org>

---
 src/lib/src/fwts_acpi_tables.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/lib/src/fwts_acpi_tables.c b/src/lib/src/fwts_acpi_tables.c
index f383aee..e40583e 100644
--- a/src/lib/src/fwts_acpi_tables.c
+++ b/src/lib/src/fwts_acpi_tables.c
@@ -959,6 +959,9 @@ int fwts_acpi_find_table(fwts_framework *fw, const char *name, const int which,
 
 	*info = NULL;
 
+	if (acpi_tables_loaded == ACPI_TABLES_LOADED_FAILED)
+		return FWTS_ERROR;
+
 	if (acpi_tables_loaded == ACPI_TABLES_NOT_LOADED)
 		if ((ret = fwts_acpi_load_tables(fw)) != FWTS_OK)
 			return ret;