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6c0eb5ba35
For bus-based driver, device removal is implemented as:
1 device_remove()->
2 bus->remove()->
3 driver->remove()
Driver core needs no inform from callee(bus driver) about the
result of remove callback. In that case, commit fc7a6209d5
("bus: Make remove callback return void") forces bus_type::remove
be void-returned.
Now we have the situation that both 1 & 2 of calling chain are
void-returned, so it does not make much sense for 3(driver->remove)
to return non-void to its caller.
So the basic idea behind this change is making remove() callback of
any bus-based driver to be void-returned.
This change, for itself, is for device drivers based on acpi-bus.
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Lee Jones <lee@kernel.org>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dawei Li <set_pte_at@outlook.com>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com> # for drivers/platform/surface/*
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/module.h>
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#include <linux/sched/signal.h>
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#include <linux/acpi.h>
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#include <acpi/button.h>
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MODULE_AUTHOR("Josh Triplett");
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MODULE_DESCRIPTION("ACPI Tiny Power Button Driver");
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MODULE_LICENSE("GPL");
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static int power_signal __read_mostly = CONFIG_ACPI_TINY_POWER_BUTTON_SIGNAL;
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module_param(power_signal, int, 0644);
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MODULE_PARM_DESC(power_signal, "Power button sends this signal to init");
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static const struct acpi_device_id tiny_power_button_device_ids[] = {
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{ ACPI_BUTTON_HID_POWER, 0 },
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{ ACPI_BUTTON_HID_POWERF, 0 },
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{ "", 0 },
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};
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MODULE_DEVICE_TABLE(acpi, tiny_power_button_device_ids);
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static int acpi_noop_add(struct acpi_device *device)
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{
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return 0;
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}
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static void acpi_noop_remove(struct acpi_device *device)
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{
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}
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static void acpi_tiny_power_button_notify(struct acpi_device *device, u32 event)
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{
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kill_cad_pid(power_signal, 1);
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}
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static struct acpi_driver acpi_tiny_power_button_driver = {
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.name = "tiny-power-button",
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.class = "tiny-power-button",
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.ids = tiny_power_button_device_ids,
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.ops = {
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.add = acpi_noop_add,
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.remove = acpi_noop_remove,
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.notify = acpi_tiny_power_button_notify,
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},
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};
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module_acpi_driver(acpi_tiny_power_button_driver);
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