[PATCH v4 3/7] ACPI: button: Access input device's users under appropriate mutex

[Rafael J. Wysocki]

On Mon, Jun 8, 2020 at 1:22 PM Andrzej Pietrasiewicz
<andrzej.p at collabora.com> wrote:
>
> Inspecting input device's 'users' member should be done under device's
> mutex, so add appropriate invocations.
>
> Signed-off-by: Andrzej Pietrasiewicz <andrzej.p at collabora.com>

This looks like a fix that might be applied independently of the other
patches in the series.

Do you want me to pick it up?

> ---
>  drivers/acpi/button.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
> index 78cfc70cb320..ff7ab291f678 100644
> --- a/drivers/acpi/button.c
> +++ b/drivers/acpi/button.c
> @@ -456,13 +456,16 @@ static int acpi_button_resume(struct device *dev)
>  {
>         struct acpi_device *device = to_acpi_device(dev);
>         struct acpi_button *button = acpi_driver_data(device);
> +       struct input_dev *input = button->input;
>
>         button->suspended = false;
> -       if (button->type == ACPI_BUTTON_TYPE_LID && button->input->users) {
> +       mutex_lock(&input->mutex);
> +       if (button->type == ACPI_BUTTON_TYPE_LID && input->users) {
>                 button->last_state = !!acpi_lid_evaluate_state(device);
>                 button->last_time = ktime_get();
>                 acpi_lid_initialize_state(device);
>         }
> +       mutex_unlock(&input->mutex);
>         return 0;
>  }
>  #endif
> --
> 2.17.1
>