linux-kernel - Re: [PATCH] x86: mcheck: call put_device on device

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Date:	Sat, 30 Nov 2013 12:44:59 +0100
From:	Levente Kurusa <levex@...ux.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Luck <tony.luck@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	EDAC <linux-edac@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: mcheck: call put_device on device_register failure

2013-11-30 12:32, Borislav Petkov:
> On Sat, Nov 30, 2013 at 12:25:44PM +0100, Levente Kurusa wrote:
>> Now this tree makes me wonder if there are devices where the author
>> forgot to set a device_release or when the put_device is not called. I
>> will take a look into this.
> 
> kobject_cleanup() warns about !t->release already.

Yes, I saw that as well. By that I meant that by doing some identifier searches
for device_register and then checking whether they call put_device and have device_release
registered. Also, I wonder if it would be beneficial to have a generic device_release? Most
of the drivers I quickly swept through only call kfree(). Wouldn't a generic one save
some space?

> 
> If you want to fix actual issues and not waste time with potential
> issues which have never actually triggered, try building a couple of
> randconfigs and look at the output :-)

Yes, I do that daily usually, but most of the time I only get some uninitialized warnings. :-)

> 
> Also, we have "make W=" which gives you even more :-)

What does that do? Never heard of it yet.

-- 
Regards,
Levente Kurusa
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