Merge tag 'counter-fixes-for-6.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wbg/counter into char-misc-next

William writes:

Counter fixes for 6.15

A fix to prevent a race condition when accessing the Count enable
component in interrupt-cnt.

* tag 'counter-fixes-for-6.15' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/wbg/counter:
counter: interrupt-cnt: Protect enable/disable OPs with mutex

drivers/counter/interrupt-cnt.c

···
  * Copyright (c) 2021 Pengutronix, Oleksij Rempel <[e-mail]>
  */
 
+#include <linux/cleanup.h>
 #include <linux/counter.h>
 #include <linux/gpio/consumer.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/platform_device.h>
 #include <linux/types.h>
 
···
 	struct gpio_desc *gpio;
 	int irq;
 	bool enabled;
+	struct mutex lock;
 	struct counter_signal signals;
 	struct counter_synapse synapses;
 	struct counter_count cnts;
···
 {
 	struct interrupt_cnt_priv *priv = counter_priv(counter);
 
+	guard(mutex)(&priv->lock);
+
 	*enable = priv->enabled;
 
 	return 0;
···
 				      struct counter_count *count, u8 enable)
 {
 	struct interrupt_cnt_priv *priv = counter_priv(counter);
+
+	guard(mutex)(&priv->lock);
 
 	if (priv->enabled == enable)
 		return 0;
···
 			       dev_name(dev), counter);
 	if (ret)
 		return ret;
+
+	mutex_init(&priv->lock);
 
 	ret = devm_counter_add(dev, counter);
 	if (ret < 0)