should failed calls to device_register() always call put_device()?

[Belisko Marek]

On Sat, May 28, 2011 at 9:43 PM, Robert P. J. Day <rpjday at crashcourse.ca> wrote:
> On Sat, 28 May 2011, Belisko Marek wrote:
>
>> On Sat, May 28, 2011 at 6:29 PM, Robert P. J. Day <rpjday at crashcourse.ca> wrote:
>> >
>> >  i agree that there should be a "put_device(&dev->dev);" statement
>> > as you show above.  however, i still don't see how this can be
>> > just a stylistic improvement as you seem to suggest.  based on the
>> > warning from the kernel source file, it would seem that you *must*
>> > do a put_device() in that situation -- it's not optional.
>
>> Sure you're right. You can send a patch to fix this problem. Good
>> catch.
>
>  i didn't want to submit anything until i verified what correct code
> should look like.  and it's not like that's the only example -- others
> are trivially easy to find, like this in
> drivers/media/video/bt8xx/bttv-gpio.c (line 97):
>
>  err = device_register(&sub->dev);
>  if (0 != err) {
>           kfree(sub);
>           return err;
>  }
I'm little bit confused. If you look at device_add which is part of
device_register if
something in device_add failed it will always call put_device (in any
error case) so why
then is necessary to call it again when device_register return error?
As you said on some
places put_device is used on some not. Assume device_register in
normal conditions
don't fail so this code is not called anyway or?

>
> that would seem to be incorrect as well, no?
>
> rday
>
> --
>
> ========================================================================
> Robert P. J. Day                                 Ottawa, Ontario, CANADA
>                        http://crashcourse.ca
>
> Twitter:                                       http://twitter.com/rpjday
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> ========================================================================

regards,

marek

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