From a9ed3aa9b87ee41e8ab3ff471b1331c154767e45 Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Sat, 26 Sep 2026 07:57:59 +1000 Subject: Merge tag 'drm-misc-fixes-2026-09-24' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-fixes A number of fixes: - bridge: - samsung-dsim: fix GPIO lifetime - client: Null pointer dereference fix - imagination: error handling fix, page handling fix - nouveau: fix reference leaks, double-frees, out-of-bounds accesses, use-after-frees, don't reject config without SCDC, a number of workarounds - virtio: fix memory leak, reference leaks, null pointer dereference, add pixel blend mode, cache coherency fix Signed-off-by: Dave Airlie From: Maxime Ripard Link: https://patch.msgid.link/arU22zzqUGDEco1y@houat --- drivers/leds/trigger/ledtrig-panic.c | 68 ++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) create mode 100644 drivers/leds/trigger/ledtrig-panic.c (limited to 'drivers/leds/trigger/ledtrig-panic.c') diff --git a/drivers/leds/trigger/ledtrig-panic.c b/drivers/leds/trigger/ledtrig-panic.c new file mode 100644 index 000000000..1d49c1078 --- /dev/null +++ b/drivers/leds/trigger/ledtrig-panic.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Kernel Panic LED Trigger + * + * Copyright 2016 Ezequiel Garcia + */ + +#include +#include +#include +#include +#include +#include "../leds.h" + +static struct led_trigger *trigger; + +/* + * This is called in a special context by the atomic panic + * notifier. This means the trigger can be changed without + * worrying about locking. + */ +static void led_trigger_set_panic(struct led_classdev *led_cdev) +{ + if (led_cdev->trigger) + list_del(&led_cdev->trig_list); + list_add_tail(&led_cdev->trig_list, &trigger->led_cdevs); + + /* Avoid the delayed blink path */ + led_cdev->blink_delay_on = 0; + led_cdev->blink_delay_off = 0; + + led_cdev->trigger = trigger; +} + +static int led_trigger_panic_notifier(struct notifier_block *nb, + unsigned long code, void *unused) +{ + struct led_classdev *led_cdev; + + list_for_each_entry(led_cdev, &leds_list, node) + if (led_cdev->flags & LED_PANIC_INDICATOR) + led_trigger_set_panic(led_cdev); + return NOTIFY_DONE; +} + +static struct notifier_block led_trigger_panic_nb = { + .notifier_call = led_trigger_panic_notifier, +}; + +static long led_panic_blink(int state) +{ + led_trigger_event(trigger, state ? LED_FULL : LED_OFF); + return 0; +} + +static int __init ledtrig_panic_init(void) +{ + led_trigger_register_simple("panic", &trigger); + if (!trigger) + return -ENOMEM; + + atomic_notifier_chain_register(&panic_notifier_list, + &led_trigger_panic_nb); + + panic_blink = led_panic_blink; + return 0; +} +device_initcall(ledtrig_panic_init); -- cgit v1.3.1