gpiolib: Get rid of never false gpio_is_valid() calls

In the cases when gpio_is_valid() is called with unsigned parameter
the result is always true in the GPIO library code, hence the check
for false won't ever be true. Get rid of such calls.

While at it, move GPIO device base to be unsigned to clearly show
it won't ever be negative. This requires a new definition for the
maximum GPIO number in the system.

Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Linus Walleij <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>

Author: andy-shev

drivers/gpio/gpiolib-legacy.c

@@ -28,10 +28,9 @@ int gpio_request_one(unsigned gpio, unsigned long flags, const char *label)
 	struct gpio_desc *desc;
 	int err;
 
-	desc = gpio_to_desc(gpio);
-
 	/* Compatibility: assume unavailable "valid" GPIOs will appear later */
-	if (!desc && gpio_is_valid(gpio))
+	desc = gpio_to_desc(gpio);
+	if (!desc)
 		return -EPROBE_DEFER;
 
 	err = gpiod_request(desc, label);
@@ -63,10 +62,11 @@ EXPORT_SYMBOL_GPL(gpio_request_one);
  */
 int gpio_request(unsigned gpio, const char *label)
 {
-	struct gpio_desc *desc = gpio_to_desc(gpio);
+	struct gpio_desc *desc;
 
 	/* Compatibility: assume unavailable "valid" GPIOs will appear later */
-	if (!desc && gpio_is_valid(gpio))
+	desc = gpio_to_desc(gpio);
+	if (!desc)
 		return -EPROBE_DEFER;
 
 	return gpiod_request(desc, label);

drivers/gpio/gpiolib-sysfs.c

@@ -412,7 +412,7 @@ static ssize_t base_show(struct device *dev,
 {
 	const struct gpio_device *gdev = dev_get_drvdata(dev);
 
-	return sysfs_emit(buf, "%d\n", gdev->base);
+	return sysfs_emit(buf, "%u\n", gdev->base);
 }
 static DEVICE_ATTR_RO(base);
 

drivers/gpio/gpiolib.c

@@ -150,9 +150,6 @@ struct gpio_desc *gpio_to_desc(unsigned gpio)
 		}
 	}
 
-	if (!gpio_is_valid(gpio))
-		pr_warn("invalid GPIO %d\n", gpio);
-
 	return NULL;
 }
 EXPORT_SYMBOL_GPL(gpio_to_desc);
@@ -297,10 +294,10 @@ struct gpio_chip *gpio_device_get_chip(struct gpio_device *gdev)
 EXPORT_SYMBOL_GPL(gpio_device_get_chip);
 
 /* dynamic allocation of GPIOs, e.g. on a hotplugged device */
-static int gpiochip_find_base_unlocked(int ngpio)
+static int gpiochip_find_base_unlocked(u16 ngpio)
 {
+	unsigned int base = GPIO_DYNAMIC_BASE;
 	struct gpio_device *gdev;
-	int base = GPIO_DYNAMIC_BASE;
 
 	list_for_each_entry_srcu(gdev, &gpio_devices, list,
 				 lockdep_is_held(&gpio_devices_lock)) {
@@ -311,9 +308,11 @@ static int gpiochip_find_base_unlocked(int ngpio)
 		base = gdev->base + gdev->ngpio;
 		if (base < GPIO_DYNAMIC_BASE)
 			base = GPIO_DYNAMIC_BASE;
+		if (base > GPIO_DYNAMIC_MAX - ngpio)
+			break;
 	}
 
-	if (gpio_is_valid(base)) {
+	if (base <= GPIO_DYNAMIC_MAX - ngpio) {
 		pr_debug("%s: found new base at %d\n", __func__, base);
 		return base;
 	} else {
@@ -749,7 +748,7 @@ static int gpiochip_setup_dev(struct gpio_device *gdev)
 	if (ret)
 		goto err_remove_device;
 
-	dev_dbg(&gdev->dev, "registered GPIOs %d to %d on %s\n", gdev->base,
+	dev_dbg(&gdev->dev, "registered GPIOs %u to %u on %s\n", gdev->base,
 		gdev->base + gdev->ngpio - 1, gdev->label);
 
 	return 0;
@@ -4788,14 +4787,14 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev)
 			value = gpio_chip_get_value(gc, desc);
 			is_irq = test_bit(FLAG_USED_AS_IRQ, &desc->flags);
 			active_low = test_bit(FLAG_ACTIVE_LOW, &desc->flags);
-			seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s%s\n",
+			seq_printf(s, " gpio-%-3u (%-20.20s|%-20.20s) %s %s %s%s\n",
 				   gpio, desc->name ?: "", gpiod_get_label(desc),
 				   is_out ? "out" : "in ",
 				   value >= 0 ? (value ? "hi" : "lo") : "?  ",
 				   is_irq ? "IRQ " : "",
 				   active_low ? "ACTIVE LOW" : "");
 		} else if (desc->name) {
-			seq_printf(s, " gpio-%-3d (%-20.20s)\n", gpio, desc->name);
+			seq_printf(s, " gpio-%-3u (%-20.20s)\n", gpio, desc->name);
 		}
 
 		gpio++;
@@ -4867,7 +4866,7 @@ static int gpiolib_seq_show(struct seq_file *s, void *v)
 		return 0;
 	}
 
-	seq_printf(s, "%s%s: GPIOs %d-%d", priv->newline ? "\n" : "",
+	seq_printf(s, "%s%s: GPIOs %u-%u", priv->newline ? "\n" : "",
 		   dev_name(&gdev->dev),
 		   gdev->base, gdev->base + gdev->ngpio - 1);
 	parent = gc->parent;

drivers/gpio/gpiolib.h

@@ -61,7 +61,7 @@ struct gpio_device {
 	struct module		*owner;
 	struct gpio_chip __rcu	*chip;
 	struct gpio_desc	*descs;
-	int			base;
+	unsigned int		base;
 	u16			ngpio;
 	bool			can_sleep;
 	const char		*label;

include/linux/gpio.h

@@ -74,6 +74,12 @@ static inline bool gpio_is_valid(int number)
  * Until they are all fixed, leave 0-512 space for them.
  */
 #define GPIO_DYNAMIC_BASE	512
+/*
+ * Define the maximum of the possible GPIO in the global numberspace.
+ * While the GPIO base and numbers are positive, we limit it with signed
+ * maximum as a lot of code is using negative values for special cases.
+ */
+#define GPIO_DYNAMIC_MAX	INT_MAX
 
 /* Always use the library code for GPIO management calls,
  * or when sleeping may be involved.