nvmem: switch to simpler IDA interface

We don't need to specify any ranges when allocating IDs so we can switch
to ida_alloc() and ida_free() instead of the ida_simple_ counterparts.

ida_simple_get(ida, 0, 0, gfp) is equivalent to
ida_alloc_range(ida, 0, UINT_MAX, gfp) which is equivalent to
ida_alloc(ida, gfp). Note: IDR will never actually allocate an ID
larger than INT_MAX.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20200917134437.16637-4-srinivas.kandagatla@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/core.c

@@ -321,7 +321,7 @@ static void nvmem_release(struct device *dev)
 {
 	struct nvmem_device *nvmem = to_nvmem_device(dev);
 
-	ida_simple_remove(&nvmem_ida, nvmem->id);
+	ida_free(&nvmem_ida, nvmem->id);
 	gpiod_put(nvmem->wp_gpio);
 	kfree(nvmem);
 }
@@ -596,7 +596,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 	if (!nvmem)
 		return ERR_PTR(-ENOMEM);
 
-	rval  = ida_simple_get(&nvmem_ida, 0, 0, GFP_KERNEL);
+	rval  = ida_alloc(&nvmem_ida, GFP_KERNEL);
 	if (rval < 0) {
 		kfree(nvmem);
 		return ERR_PTR(rval);
@@ -608,7 +608,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
 		nvmem->wp_gpio = gpiod_get_optional(config->dev, "wp",
 						    GPIOD_OUT_HIGH);
 	if (IS_ERR(nvmem->wp_gpio)) {
-		ida_simple_remove(&nvmem_ida, nvmem->id);
+		ida_free(&nvmem_ida, nvmem->id);
 		rval = PTR_ERR(nvmem->wp_gpio);
 		kfree(nvmem);
 		return ERR_PTR(rval);