[PATCH 23/23] gpiolib: Remove unused `chip` and `srcu` in struct gpio_device

[Tzung-Bi Shih <tzungbi@kernel.org>]

`chip` and `srcu` in struct gpio_device are unused as their usages are
replaced to use revocable.  Remove them.

Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
 drivers/gpio/gpiolib.c | 26 +-------------------------
 drivers/gpio/gpiolib.h |  4 ----
 2 files changed, 1 insertion(+), 29 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 44915c8b6131..31f6cc27e0b7 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -424,8 +424,6 @@ static int gpiochip_get_direction(struct gpio_chip *gc, unsigned int offset)
 {
 	int ret;
 
-	lockdep_assert_held(&gc->gpiodev->srcu);
-
 	if (WARN_ON(!gc->get_direction))
 		return -EOPNOTSUPP;
 
@@ -880,7 +878,6 @@ static void gpiodev_release(struct device *dev)
 	ida_free(&gpio_ida, gdev->id);
 	kfree_const(gdev->label);
 	kfree(gdev->descs);
-	cleanup_srcu_struct(&gdev->srcu);
 	kfree(gdev);
 }
 
@@ -1104,14 +1101,9 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 		goto err_free_descs;
 	}
 
-	ret = init_srcu_struct(&gdev->srcu);
-	if (ret)
-		goto err_free_label;
-	rcu_assign_pointer(gdev->chip, gc);
-
 	ret = init_srcu_struct(&gdev->desc_srcu);
 	if (ret)
-		goto err_cleanup_gdev_srcu;
+		goto err_free_label;
 
 	gdev->chip_rp = revocable_provider_alloc(gc);
 	if (!gdev->chip_rp) {
@@ -1286,8 +1278,6 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
 
 err_cleanup_desc_srcu:
 	cleanup_srcu_struct(&gdev->desc_srcu);
-err_cleanup_gdev_srcu:
-	cleanup_srcu_struct(&gdev->srcu);
 err_free_label:
 	kfree_const(gdev->label);
 err_free_descs:
@@ -1330,8 +1320,6 @@ void gpiochip_remove(struct gpio_chip *gc)
 	synchronize_srcu(&gpio_devices_srcu);
 
 	/* Numb the device, cancelling all outstanding operations */
-	rcu_assign_pointer(gdev->chip, NULL);
-	synchronize_srcu(&gdev->srcu);
 	revocable_provider_revoke(gdev->chip_rp);
 	gpio_device_teardown_shared(gdev);
 	gpiochip_irqchip_remove(gc);
@@ -2843,8 +2831,6 @@ static int gpiochip_direction_input(struct gpio_chip *gc, unsigned int offset)
 {
 	int ret;
 
-	lockdep_assert_held(&gc->gpiodev->srcu);
-
 	if (WARN_ON(!gc->direction_input))
 		return -EOPNOTSUPP;
 
@@ -2860,8 +2846,6 @@ static int gpiochip_direction_output(struct gpio_chip *gc, unsigned int offset,
 {
 	int ret;
 
-	lockdep_assert_held(&gc->gpiodev->srcu);
-
 	if (WARN_ON(!gc->direction_output))
 		return -EOPNOTSUPP;
 
@@ -2952,8 +2936,6 @@ static int gpiochip_set(struct gpio_chip *gc, unsigned int offset, int value)
 {
 	int ret;
 
-	lockdep_assert_held(&gc->gpiodev->srcu);
-
 	if (WARN_ON(unlikely(!gc->set)))
 		return -EOPNOTSUPP;
 
@@ -3312,8 +3294,6 @@ static int gpiochip_get(struct gpio_chip *gc, unsigned int offset)
 {
 	int ret;
 
-	lockdep_assert_held(&gc->gpiodev->srcu);
-
 	/* Make sure this is called after checking for gc->get(). */
 	ret = gc->get(gc, offset);
 	if (ret > 1)
@@ -3368,8 +3348,6 @@ static int gpiod_get_raw_value_commit(const struct gpio_desc *desc)
 static int gpio_chip_get_multiple(struct gpio_chip *gc,
 				  unsigned long *mask, unsigned long *bits)
 {
-	lockdep_assert_held(&gc->gpiodev->srcu);
-
 	if (gc->get_multiple) {
 		int ret;
 
@@ -3731,8 +3709,6 @@ static int gpiochip_set_multiple(struct gpio_chip *gc,
 	unsigned int i;
 	int ret;
 
-	lockdep_assert_held(&gc->gpiodev->srcu);
-
 	if (gc->set_multiple) {
 		ret = gc->set_multiple(gc, mask, bits);
 		if (ret > 0)
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 00aa354950c9..c1952c287a64 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -28,7 +28,6 @@
  * @chrdev: character device for the GPIO device
  * @id: numerical ID number for the GPIO chip
  * @owner: helps prevent removal of modules exporting active GPIOs
- * @chip: pointer to the corresponding gpiochip, holding static
  * data for this device
  * @descs: array of ngpio descriptors.
  * @valid_mask: If not %NULL, holds bitmask of GPIOs which are valid to be
@@ -51,7 +50,6 @@
  *                 process context
  * @device_notifier: used to notify character device wait queues about the GPIO
  *                   device being unregistered
- * @srcu: protects the pointer to the underlying GPIO chip
  * @chip_rp: revocable provider handle for the corresponding struct gpio_chip.
  * @pin_ranges: range of pins served by the GPIO driver
  *
@@ -65,7 +63,6 @@ struct gpio_device {
 	struct cdev		chrdev;
 	int			id;
 	struct module		*owner;
-	struct gpio_chip __rcu	*chip;
 	struct gpio_desc	*descs;
 	unsigned long		*valid_mask;
 	struct srcu_struct	desc_srcu;
@@ -79,7 +76,6 @@ struct gpio_device {
 	rwlock_t		line_state_lock;
 	struct workqueue_struct	*line_state_wq;
 	struct blocking_notifier_head device_notifier;
-	struct srcu_struct	srcu;
 	struct revocable_provider *chip_rp;
 
 #ifdef CONFIG_PINCTRL
-- 
2.52.0.457.g6b5491de43-goog