Older compilers like gcc-4.8 produce a bogus warning here
In file included from include/linux/compiler_types.h:68:0,
from <command-line>:0:
drivers/acpi/property.c: In function 'acpi_data_prop_read':
include/linux/compiler-gcc.h:75:45: error: 'obj' may be used uninitialized in
this function [-Werror=maybe-uninitialized]
#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
^
drivers/acpi/property.c:934:27: note: 'obj' was declared here
const union acpi_object *obj;
^
Ensure the output is always initialized even when returning an error
to avoid the warning.
Signed-off-by: Arnd Bergmann <[email protected]>
---
drivers/acpi/property.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/property.c b/drivers/acpi/property.c
index e601c4511a8b..3aa71daeb0b4 100644
--- a/drivers/acpi/property.c
+++ b/drivers/acpi/property.c
@@ -587,8 +587,10 @@ static int acpi_data_get_property_array(const struct
acpi_device_data *data,
int ret, i;
ret = acpi_data_get_property(data, name, ACPI_TYPE_PACKAGE, &prop);
- if (ret)
+ if (ret && obj) {
+ *obj = NULL;
return ret;
+ }
if (type != ACPI_TYPE_ANY) {
/* Check that all elements are of correct type. */
--
2.26.0
