[PATCH 12/18] gpio: mockup: fix debugfs handling

Bartosz Golaszewski
2017-11-27T10:58:39Z

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>
---
drivers/gpio/gpio-mockup.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index dba5e79e3278..68a0c1e06a16 100644
--- 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);
--
2.15.0