linux-kernel - Re: [git patches] two warning fixes

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Date:	Mon, 23 Jul 2007 07:29:20 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Krzysztof Halasa <khc@...waw.pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>, ak@...e.de,
	adaplas@...il.com, linux-fbdev-devel@...ts.sourceforge.net
Subject: Re: [git patches] two warning fixes


> Not necessarily as simple as that -- you need to make sure you don't 
> pass something bogus to a sysfs_remove_blah() function at 
> unregister/unload time, if sysfs_create_blah() failed.
> 
> Certainly sysfs_foo() failure is often ignorable in the sense that you 
> want the driver to keep loading... but that does not imply that it is 
> strictly ignorable, if you also consider the associated cleanup code.

It should be trivial enough to have sysfs_create_blah() do enough
initializations before it can fail so that sysfs_remove_blah() do the
right thing regardless.

It's actually a major PITA for a driver that creates a whole bunch of
sysfs files to have to track precisely which ones were created
successfully for the error path. If it's a single function, goto does
the trick but if for some reason it's not, it's really annoying.

Ben.


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