It is possible that acpi_evaluate_integer might fail and value would not be
set to any value so correct this defect by returning 0 in case of an
error. This is also the correct thing to return because the backlight
subsystem will print the old value of brightness in this case.
Signed-off-by: Giedrius Statkevičius <giedrius.statkevic...@gmail.com>
---
drivers/platform/x86/asus-laptop.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/x86/asus-laptop.c
b/drivers/platform/x86/asus-laptop.c
index 9a69734..15f1311 100644
--- a/drivers/platform/x86/asus-laptop.c
+++ b/drivers/platform/x86/asus-laptop.c
@@ -775,8 +775,10 @@ static int asus_read_brightness(struct backlight_device
*bd)
rv = acpi_evaluate_integer(asus->handle, METHOD_BRIGHTNESS_GET,
NULL, &value);
- if (ACPI_FAILURE(rv))
+ if (ACPI_FAILURE(rv)) {
pr_warn("Error reading brightness\n");
+ return 0;
+ }
return value;
}
--
2.8.0
