Re: [PATCH 24/61] sysfs: make sysfs_put() ignore NULL sd

[YOSHIFUJI Hideaki / 吉藤英明]

In article <20070711235529.GA7485@xxxxxxx> (at Wed, 11 Jul 2007 16:55:29 -0700), Greg KH <gregkh@xxxxxxx> says:

> On Thu, Jul 12, 2007 at 08:50:47AM +0900, YOSHIFUJI Hideaki / ?$B5HF#1QL@ wrote:
> > In article <11841968512510-git-send-email-gregkh@xxxxxxx> (at Wed, 11 Jul 2007 16:31:43 -0700), Greg Kroah-Hartman <gregkh@xxxxxxx> says:
> > 
> > > Make sysfs_put() ignore NULL sd instead of oopsing.
> > 
> > I do not think this is a good idea; it is non-sense (and rather a bug)
> > to call "put" with NULL argument in general.
> 
> It's better than having to check it all the time in the caller :)

How many callers do we have that will get benefit from this change?

Well, the change will hide the bug. It seems all callers in fs/sysfs
already assume that the argument is NOT NULL, and it is a bug to call
sysfs_put() with NULL; the function should be used to "put" something
you "have" (non-NULL). If it is called with NULL, I would say, we
should BUG here to detect the logical bug.

--yoshfuji
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