linux-kernel - Re: [PATCH 1/8] fs/9p: Deletion of unnecessary checks before the function call "p9_client

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Date:	Mon, 05 Jan 2015 22:55:16 +0100
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Julia Lawall <julia.lawall@...6.fr>
CC:	Dan Carpenter <dan.carpenter@...cle.com>,
	Eric Van Hensbergen <ericvh@...il.com>,
	Latchesar Ionkov <lucho@...kov.net>,
	Ron Minnich <rminnich@...dia.gov>,
	v9fs-developer@...ts.sourceforge.net,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/8] fs/9p: Deletion of unnecessary checks before the
 function call "p9_client_clunk"

>> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/net/9p/client.c?id=d8282ea05ad119247122de23db7d48ad6098cfa2#n1448
>> http://lxr.free-electrons.com/source/net/9p/client.c#L1448
> 
> What do you mean by "work in principle"?

If I do not stumble on an unexpected name space issue from my static source
analysis again, then I would see the linked function as relevant here.
Its implementation provides a clear input parameter validation.


> But you don't want to do a dump_stack for no reason.  That would at best
> be very misleading, and I would imagine be quite expensive.

The error response is clear. Are any software developments efforts expected
to clean-up the call stack for unwanted null pointers even more?

Regards,
Markus
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