gpio: mockup: fix debugfs handling

The debugfs routines returning pointers can return NULL or error codes
embedded with ERR_PTR(). Check the return values with IS_ERR_OR_NULL().

While we're at it: make the error message more specific so it's not
confused with the one emitted when the top-level gpio-mockup debugfs
directory creation fails.

Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index dba5e79e3278b4390ac4bef3fcb802cbef129778..68a0c1e06a16359c935d8a73c87252ea30fd20d2 100644 (file)
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -183,11 +183,11 @@ static void gpio_mockup_debugfs_setup(struct device *dev,
        devname = dev_name(&gc->gpiodev->dev);
 
        chip->dbg_dir = debugfs_create_dir(devname, gpio_mockup_dbg_dir);
-       if (!chip->dbg_dir)
+       if (IS_ERR_OR_NULL(chip->dbg_dir))
                goto err;
 
        link = debugfs_create_symlink(gc->label, gpio_mockup_dbg_dir, devname);
-       if (!link)
+       if (IS_ERR_OR_NULL(link))
                goto err;
 
        for (i = 0; i < gc->ngpio; i++) {
@@ -205,14 +205,14 @@ static void gpio_mockup_debugfs_setup(struct device *dev,
 
                evfile = debugfs_create_file(name, 0200, chip->dbg_dir, priv,
                                             &gpio_mockup_event_ops);
-               if (!evfile)
+               if (IS_ERR_OR_NULL(evfile))
                        goto err;
        }
 
        return;
 
 err:
-       dev_err(dev, "error creating debugfs directory\n");
+       dev_err(dev, "error creating debugfs event files\n");
 }
 
 static int gpio_mockup_name_lines(struct device *dev,
@@ -336,7 +336,7 @@ static int __init gpio_mockup_init(void)
        num_chips = gpio_mockup_params_nr / 2;
 
        gpio_mockup_dbg_dir = debugfs_create_dir("gpio-mockup-event", NULL);
-       if (!gpio_mockup_dbg_dir)
+       if (IS_ERR_OR_NULL(gpio_mockup_dbg_dir))
                gpio_mockup_err("error creating debugfs directory\n");
 
        err = platform_driver_register(&gpio_mockup_driver);