Input: gpio-keys - fix possible concurrent access in gpio_keys_irq_timer()

BugLink: https://bugs.launchpad.net/bugs/2120812

commit 8f38219fa139623c29db2cb0f17d0a197a86e344 upstream.

gpio_keys_irq_isr() and gpio_keys_irq_timer() access the same resources.
There could be a concurrent access if a GPIO interrupt occurs in parallel
of a HR timer interrupt.

Guard back those resources with a spinlock.

Fixes: 019002f ("Input: gpio-keys - use hrtimer for release timer")
Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Link: https://lore.kernel.org/r/20250528-gpio_keys_preempt_rt-v2-2-3fc55a9c3619@foss.st.com
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Noah Wager <noah.wager@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

Author: GseoC

drivers/input/keyboard/gpio_keys.c

@@ -449,6 +449,8 @@ static enum hrtimer_restart gpio_keys_irq_timer(struct hrtimer *t)
 						      release_timer);
 	struct input_dev *input = bdata->input;
 
+	guard(spinlock_irqsave)(&bdata->lock);
+
 	if (bdata->key_pressed) {
 		input_report_key(input, *bdata->code, 0);
 		input_sync(input);