The original intent of 84d3f6b76447 was to delay evaluating lid state until
all drivers have been loaded, with input device being opened from userspace
serving as a signal for this condition. Let's ensure that state updates
happen even if userspace closed (or in the future inhibited) input device.
Note that if we go through suspend/resume cycle we assume the system has
been fully initialized even if LID input device has not been opened yet.
This has a side-effect of fixing access to input->users outside of
input->mutex protections by the way of eliminating said accesses and using
driver private flag.
Fixes: 84d3f6b76447 ("ACPI / button: Delay acpi_lid_initialize_state() until first user space open")
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>
---
drivers/acpi/button.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 78cfc70cb320..b8dd51d8f96d 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -154,6 +154,7 @@ struct acpi_button {
int last_state;
ktime_t last_time;
bool suspended;
+ bool lid_state_initialized;
};
static struct acpi_device *lid_device;
@@ -384,6 +385,8 @@ static int acpi_lid_update_state(struct acpi_device *device,
static void acpi_lid_initialize_state(struct acpi_device *device)
{
+ struct acpi_button *button = acpi_driver_data(device);
+
switch (lid_init_state) {
case ACPI_BUTTON_LID_INIT_OPEN:
(void)acpi_lid_notify_state(device, 1);
@@ -395,13 +398,14 @@ static void acpi_lid_initialize_state(struct acpi_device *device)
default:
break;
}
+
+ button->lid_state_initialized = true;
}
static void acpi_button_notify(struct acpi_device *device, u32 event)
{
struct acpi_button *button = acpi_driver_data(device);
struct input_dev *input;
- int users;
switch (event) {
case ACPI_FIXED_HARDWARE_EVENT:
@@ -410,10 +414,7 @@ static void acpi_button_notify(struct acpi_device *device, u32 event)
case ACPI_BUTTON_NOTIFY_STATUS:
input = button->input;
if (button->type == ACPI_BUTTON_TYPE_LID) {
- mutex_lock(&button->input->mutex);
- users = button->input->users;
- mutex_unlock(&button->input->mutex);
- if (users)
+ if (button->lid_state_initialized)
acpi_lid_update_state(device, true);
} else {
int keycode;
@@ -458,7 +459,7 @@ static int acpi_button_resume(struct device *dev)
struct acpi_button *button = acpi_driver_data(device);
button->suspended = false;
- if (button->type == ACPI_BUTTON_TYPE_LID && button->input->users) {
+ if (button->type == ACPI_BUTTON_TYPE_LID) {
button->last_state = !!acpi_lid_evaluate_state(device);
button->last_time = ktime_get();
acpi_lid_initialize_state(device);
--
2.28.0.806.g8561365e88-goog
--
Dmitry
