Re: Question about handling return value of device_create_file function

["Dmitry Torokhov" <dmitry.torokhov@gmail.com>]

On 8/18/06, Michal Piotrowski <michal.k.k.piotrowski@gmail.com> wrote:
> Hi,
>
> I have noticed that sparse generates a lot of "ignoring return value
> of 'device_create_file'" warnings.
>
> (cat sparse.txt | grep -c "device_create_file"
> 1231 :)
>
> I want to fix this warnings, but I'm wondering how to properly handle
> return value of device_create_file function.
>
> The shortest way.
>
> int foo()
> {
>        int error;
>
>        [..]
>
>        error = device_create_file(&bar, &bas)
>
>        if (error)
>                return error;
> }
>
> A bit longer way.
>
> int foo()
> {
>        int error;
>
>        [..]
>
>        error = device_create_file(&bar, &bas)
>
>        if (error) {
>                subsystem_remove_device(bar);
>                return error;
>        }
> }

Normally you should use 2nd form, especially when foo is a
module_init(foo) as you do not want to have a half-registered device
without supporting code in kernel.

--
Dmitry
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