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platform/x86: asus-wireless: Fix uninitialized symbol usage 

'ret' will not be initialized if acpi_evaluate_integer() returns through
an error path, so it should not be used in this case. This fixes the
following Smatch static analyser error:

 drivers/platform/x86/asus-wireless.c:76 asus_wireless_method() error:
                                                     uninitialized symbol 'ret'.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: João Paulo Rechi Vita <jprvita@endlessm.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
João Paulo Rechi Vita 2018-06-29 15:12:46 -07:00 committed by Andy Shevchenko
parent 6bb6ec285d
commit eca4c4e47e
1 changed files with 13 additions and 10 deletions
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23
drivers/platform/x86/asus-wireless.c
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@ -52,13 +52,12 @@ static const struct acpi_device_id device_ids[] = {
}; };
MODULE_DEVICE_TABLE(acpi, device_ids); MODULE_DEVICE_TABLE(acpi, device_ids);
static u64 asus_wireless_method(acpi_handle handle, const char *method, static acpi_status asus_wireless_method(acpi_handle handle, const char *method,
int param) int param, u64 *ret)
{ {
struct acpi_object_list p; struct acpi_object_list p;
union acpi_object obj; union acpi_object obj;
acpi_status s; acpi_status s;
u64 ret;
acpi_handle_debug(handle, "Evaluating method %s, parameter %#x\n", acpi_handle_debug(handle, "Evaluating method %s, parameter %#x\n",
method, param); method, param);
@ -67,24 +66,27 @@ static u64 asus_wireless_method(acpi_handle handle, const char *method,
p.count = 1; p.count = 1;
p.pointer = &obj; p.pointer = &obj;
s = acpi_evaluate_integer(handle, (acpi_string) method, &p, &ret); s = acpi_evaluate_integer(handle, (acpi_string) method, &p, ret);
if (ACPI_FAILURE(s)) if (ACPI_FAILURE(s))
acpi_handle_err(handle, acpi_handle_err(handle,
"Failed to eval method %s, param %#x (%d)\n", "Failed to eval method %s, param %#x (%d)\n",
method, param, s); method, param, s);
acpi_handle_debug(handle, "%s returned %#llx\n", method, ret); else
return ret; acpi_handle_debug(handle, "%s returned %#llx\n", method, *ret);
return s;
} }
static enum led_brightness led_state_get(struct led_classdev *led) static enum led_brightness led_state_get(struct led_classdev *led)
{ {
struct asus_wireless_data *data; struct asus_wireless_data *data;
int s; acpi_status s;
u64 ret;
data = container_of(led, struct asus_wireless_data, led); data = container_of(led, struct asus_wireless_data, led);
s = asus_wireless_method(acpi_device_handle(data->adev), "HSWC", s = asus_wireless_method(acpi_device_handle(data->adev), "HSWC",
data->hswc_params->status); data->hswc_params->status, &ret);
if (s == data->hswc_params->on) if (ACPI_SUCCESS(s) && ret == data->hswc_params->on)
return LED_FULL; return LED_FULL;
return LED_OFF; return LED_OFF;
} }
@ -92,10 +94,11 @@ static enum led_brightness led_state_get(struct led_classdev *led)
static void led_state_update(struct work_struct *work) static void led_state_update(struct work_struct *work)
{ {
struct asus_wireless_data *data; struct asus_wireless_data *data;
u64 ret;
data = container_of(work, struct asus_wireless_data, led_work); data = container_of(work, struct asus_wireless_data, led_work);
asus_wireless_method(acpi_device_handle(data->adev), "HSWC", asus_wireless_method(acpi_device_handle(data->adev), "HSWC",
data->led_state); data->led_state, &ret);
} }
static void led_state_set(struct led_classdev *led, enum led_brightness value) static void led_state_set(struct led_classdev *led, enum led_brightness value)