Ensure struct gpio_chip for gpiochip_setup_dev().  This eliminates a few
checks for struct gpio_chip.

Signed-off-by: Tzung-Bi Shih <[email protected]>
---
 drivers/gpio/gpiolib-cdev.c  | 13 ++-----------
 drivers/gpio/gpiolib-cdev.h  |  3 ++-
 drivers/gpio/gpiolib-sysfs.c | 11 ++---------
 drivers/gpio/gpiolib-sysfs.h |  5 +++--
 drivers/gpio/gpiolib.c       | 24 +++++++++++++++++-------
 5 files changed, 26 insertions(+), 30 deletions(-)

diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c
index 66bd260c68e9..24449bbe38c9 100644
--- a/drivers/gpio/gpiolib-cdev.c
+++ b/drivers/gpio/gpiolib-cdev.c
@@ -2784,9 +2784,9 @@ static const struct file_operations gpio_fileops = {
 #endif
 };
 
-int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt)
+int gpiolib_cdev_register(struct gpio_device *gdev, struct gpio_chip *gc,
+                         dev_t devt)
 {
-       struct gpio_chip *gc;
        int ret;
 
        cdev_init(&gdev->chrdev, &gpio_fileops);
@@ -2802,18 +2802,9 @@ int gpiolib_cdev_register(struct gpio_device *gdev, 
dev_t devt)
        if (ret)
                goto err_free_workqueue;
 
-       guard(srcu)(&gdev->srcu);
-       gc = srcu_dereference(gdev->chip, &gdev->srcu);
-       if (!gc) {
-               ret = -ENODEV;
-               goto err_free_cdev;
-       }
-
        gpiochip_dbg(gc, "added GPIO chardev (%d:%d)\n", MAJOR(devt), gdev->id);
 
        return 0;
-err_free_cdev:
-       cdev_device_del(&gdev->chrdev, &gdev->dev);
 err_free_workqueue:
        destroy_workqueue(gdev->line_state_wq);
        return ret;
diff --git a/drivers/gpio/gpiolib-cdev.h b/drivers/gpio/gpiolib-cdev.h
index b42644cbffb8..16ef1e2e96a0 100644
--- a/drivers/gpio/gpiolib-cdev.h
+++ b/drivers/gpio/gpiolib-cdev.h
@@ -7,7 +7,8 @@
 
 struct gpio_device;
 
-int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt);
+int gpiolib_cdev_register(struct gpio_device *gdev, struct gpio_chip *gc,
+                         dev_t devt);
 void gpiolib_cdev_unregister(struct gpio_device *gdev);
 
 #endif /* GPIOLIB_CDEV_H */
diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c
index 8e6b09d8b559..a4427a5cfa85 100644
--- a/drivers/gpio/gpiolib-sysfs.c
+++ b/drivers/gpio/gpiolib-sysfs.c
@@ -978,10 +978,9 @@ void gpiod_unexport(struct gpio_desc *desc)
 }
 EXPORT_SYMBOL_GPL(gpiod_unexport);
 
-int gpiochip_sysfs_register(struct gpio_device *gdev)
+int gpiochip_sysfs_register(struct gpio_device *gdev, struct gpio_chip *chip)
 {
        struct gpiodev_data *data;
-       struct gpio_chip *chip;
        struct device *parent;
        int err;
 
@@ -994,12 +993,6 @@ int gpiochip_sysfs_register(struct gpio_device *gdev)
        if (!class_is_registered(&gpio_class))
                return 0;
 
-       guard(srcu)(&gdev->srcu);
-
-       chip = srcu_dereference(gdev->chip, &gdev->srcu);
-       if (!chip)
-               return -ENODEV;
-
        /*
         * For sysfs backward compatibility we need to preserve this
         * preferred parenting to the gpio_chip parent field, if set.
@@ -1082,7 +1075,7 @@ static int gpiofind_sysfs_register(struct gpio_chip *gc, 
const void *data)
        struct gpio_device *gdev = gc->gpiodev;
        int ret;
 
-       ret = gpiochip_sysfs_register(gdev);
+       ret = gpiochip_sysfs_register(gdev, gc);
        if (ret)
                gpiochip_err(gc, "failed to register the sysfs entry: %d\n", 
ret);
 
diff --git a/drivers/gpio/gpiolib-sysfs.h b/drivers/gpio/gpiolib-sysfs.h
index 93debe8e118c..192b1ee041a6 100644
--- a/drivers/gpio/gpiolib-sysfs.h
+++ b/drivers/gpio/gpiolib-sysfs.h
@@ -7,13 +7,14 @@ struct gpio_device;
 
 #ifdef CONFIG_GPIO_SYSFS
 
-int gpiochip_sysfs_register(struct gpio_device *gdev);
+int gpiochip_sysfs_register(struct gpio_device *gdev, struct gpio_chip *chip);
 void gpiochip_sysfs_unregister(struct gpio_device *gdev,
                               struct gpio_chip *chip);
 
 #else
 
-static inline int gpiochip_sysfs_register(struct gpio_device *gdev)
+static inline int gpiochip_sysfs_register(struct gpio_device *gdev,
+                                         struct gpio_chip *chip)
 {
        return 0;
 }
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index c3e1465042c4..efe72b81e131 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -882,14 +882,15 @@ static const struct device_type gpio_dev_type = {
 };
 
 #ifdef CONFIG_GPIO_CDEV
-#define gcdev_register(gdev, devt)     gpiolib_cdev_register((gdev), (devt))
+#define gcdev_register(gdev, gc, devt) \
+               gpiolib_cdev_register((gdev), (gc), (devt))
 #define gcdev_unregister(gdev)         gpiolib_cdev_unregister((gdev))
 #else
 /*
  * gpiolib_cdev_register() indirectly calls device_add(), which is still
  * required even when cdev is not selected.
  */
-#define gcdev_register(gdev, devt)     device_add(&(gdev)->dev)
+#define gcdev_register(gdev, gc, devt) device_add(&(gdev)->dev)
 #define gcdev_unregister(gdev)         device_del(&(gdev)->dev)
 #endif
 
@@ -897,7 +898,7 @@ static const struct device_type gpio_dev_type = {
  * An initial reference count has been held in gpiochip_add_data_with_key().
  * The caller should drop the reference via gpio_device_put() on errors.
  */
-static int gpiochip_setup_dev(struct gpio_device *gdev)
+static int gpiochip_setup_dev(struct gpio_device *gdev, struct gpio_chip *gc)
 {
        struct fwnode_handle *fwnode = dev_fwnode(&gdev->dev);
        int ret;
@@ -911,11 +912,11 @@ static int gpiochip_setup_dev(struct gpio_device *gdev)
        if (fwnode && !fwnode->dev)
                fwnode_dev_initialized(fwnode, false);
 
-       ret = gcdev_register(gdev, gpio_devt);
+       ret = gcdev_register(gdev, gc, gpio_devt);
        if (ret)
                return ret;
 
-       ret = gpiochip_sysfs_register(gdev);
+       ret = gpiochip_sysfs_register(gdev, gc);
        if (ret)
                goto err_remove_device;
 
@@ -962,13 +963,22 @@ static void machine_gpiochip_add(struct gpio_chip *gc)
 static void gpiochip_setup_devs(void)
 {
        struct gpio_device *gdev;
+       struct gpio_chip *gc;
        int ret;
 
        guard(srcu)(&gpio_devices_srcu);
 
        list_for_each_entry_srcu(gdev, &gpio_devices, list,
                                 srcu_read_lock_held(&gpio_devices_srcu)) {
-               ret = gpiochip_setup_dev(gdev);
+               guard(srcu)(&gdev->srcu);
+
+               gc = srcu_dereference(gdev->chip, &gdev->srcu);
+               if (!gc) {
+                       dev_err(&gdev->dev, "Underlying GPIO chip is gone\n");
+                       continue;
+               }
+
+               ret = gpiochip_setup_dev(gdev, gc);
                if (ret) {
                        gpio_device_put(gdev);
                        dev_err(&gdev->dev,
@@ -1222,7 +1232,7 @@ int gpiochip_add_data_with_key(struct gpio_chip *gc, void 
*data,
         * (i.e., `gpio_bus_type` is ready).  Otherwise, defer until later.
         */
        if (gpiolib_initialized) {
-               ret = gpiochip_setup_dev(gdev);
+               ret = gpiochip_setup_dev(gdev, gc);
                if (ret)
                        goto err_teardown_shared;
        }
-- 
2.52.0.457.g6b5491de43-goog


Reply via email to