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wwan: core: Avoid returning NULL from wwan_create_dev()

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Make wwan_create_dev() to return either valid or error pointer,
In some cases it may return NULL. Prevent this by converting
it to the respective error pointer.

Fixes: 9a44c1cc63 ("net: Add a WWAN subsystem")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Reviewed-by: Loic Poulain <loic.poulain@linaro.org>
Link: https://lore.kernel.org/r/20210811124845.10955-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Andy Shevchenko 2021-08-11 15:48:45 +03:00 • committed by Jakub Kicinski
parent 700fa08da4
commit d9d5b89612
1 changed files with 8 additions and 4 deletions
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12
drivers/net/wwan/wwan_core.c
View file

@ -164,11 +164,14 @@ static struct wwan_device *wwan_create_dev(struct device *parent)
goto done_unlock;
id = ida_alloc(&wwan_dev_ids, GFP_KERNEL);
if (id < 0)
if (id < 0) {
wwandev = ERR_PTR(id);
goto done_unlock;
}
wwandev = kzalloc(sizeof(*wwandev), GFP_KERNEL);
if (!wwandev) {
wwandev = ERR_PTR(-ENOMEM);
ida_free(&wwan_dev_ids, id);
goto done_unlock;
}
@ -182,7 +185,8 @@ static struct wwan_device *wwan_create_dev(struct device *parent)
err = device_register(&wwandev->dev);
if (err) {
put_device(&wwandev->dev);
wwandev = NULL;
wwandev = ERR_PTR(err);
goto done_unlock;
}
done_unlock:
@ -1014,8 +1018,8 @@ int wwan_register_ops(struct device *parent, const struct wwan_ops *ops,
return -EINVAL;
wwandev = wwan_create_dev(parent);
if (!wwandev)
return -ENOMEM;
if (IS_ERR(wwandev))
return PTR_ERR(wwandev);
if (WARN_ON(wwandev->ops)) {
wwan_remove_dev(wwandev);