dell-laptop: Only install the i8042 filter when rfkill is active
Installing the i8042 filter is not useful on machines where rfkill is not
whitelisted, so move the filter installation into dell_setup_rfkill,
after the whitelist check.
This avoids doing a needless and potentially troublesome rfkill query
(dell_send_request(buf, 17, 11)) when the wireless Fn key gets pressed on
non whitelisted laptops.
This patch was written as a result of:
https://bugzilla.redhat.com/show_bug.cgi?id=1045807
It is not yet clear if this is related, but it is a good idea to not register
the i8042 filter in general.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>
diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
index d2ceb76..fed4111 100644
--- a/drivers/platform/x86/dell-laptop.c
+++ b/drivers/platform/x86/dell-laptop.c
@@ -559,6 +559,29 @@
}
static DECLARE_DELAYED_WORK(dell_rfkill_work, dell_update_rfkill);
+static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
+ struct serio *port)
+{
+ static bool extended;
+
+ if (str & 0x20)
+ return false;
+
+ if (unlikely(data == 0xe0)) {
+ extended = true;
+ return false;
+ } else if (unlikely(extended)) {
+ switch (data) {
+ case 0x8:
+ schedule_delayed_work(&dell_rfkill_work,
+ round_jiffies_relative(HZ / 4));
+ break;
+ }
+ extended = false;
+ }
+
+ return false;
+}
static int __init dell_setup_rfkill(void)
{
@@ -636,7 +659,16 @@
goto err_wwan;
}
+ ret = i8042_install_filter(dell_laptop_i8042_filter);
+ if (ret) {
+ pr_warn("Unable to install key filter\n");
+ goto err_filter;
+ }
+
return 0;
+err_filter:
+ if (wwan_rfkill)
+ rfkill_unregister(wwan_rfkill);
err_wwan:
rfkill_destroy(wwan_rfkill);
if (bluetooth_rfkill)
@@ -758,30 +790,6 @@
led_classdev_unregister(&touchpad_led);
}
-static bool dell_laptop_i8042_filter(unsigned char data, unsigned char str,
- struct serio *port)
-{
- static bool extended;
-
- if (str & 0x20)
- return false;
-
- if (unlikely(data == 0xe0)) {
- extended = true;
- return false;
- } else if (unlikely(extended)) {
- switch (data) {
- case 0x8:
- schedule_delayed_work(&dell_rfkill_work,
- round_jiffies_relative(HZ / 4));
- break;
- }
- extended = false;
- }
-
- return false;
-}
-
static int __init dell_init(void)
{
int max_intensity = 0;
@@ -831,12 +839,6 @@
goto fail_rfkill;
}
- ret = i8042_install_filter(dell_laptop_i8042_filter);
- if (ret) {
- pr_warn("Unable to install key filter\n");
- goto fail_filter;
- }
-
if (quirks && quirks->touchpad_led)
touchpad_led_init(&platform_device->dev);
@@ -888,7 +890,6 @@
fail_backlight:
i8042_remove_filter(dell_laptop_i8042_filter);
cancel_delayed_work_sync(&dell_rfkill_work);
-fail_filter:
dell_cleanup_rfkill();
fail_rfkill:
free_page((unsigned long)bufferpage);