linux-kernel - Re: [PATCH] mei: mei-amt-version: remove unneeded call of mei

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Date:	Fri, 03 Jan 2014 17:14:59 +0000
From:	David Howells <dhowells@...hat.com>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	dhowells@...hat.com, akpm@...ux-foundation.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tomas Winkler <tomas.winkler@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mei: mei-amt-version: remove unneeded call of mei_deinit()

Paul Bolle <pebolle@...cali.nl> wrote:

> From: Paul Bolle <pebolle@...cali.nl>
> 
> Building mei-amt-version.o triggers a GCC warning:
>     Documentation/misc-devices/mei/mei-amt-version.c: In function 'main':
>     Documentation/misc-devices/mei/mei-amt-version.c:103:5: warning: 'acmd.fd' is used uninitialized in this function [-Wuninitialized]
>       if (cl->fd != -1)
>          ^
>     Documentation/misc-devices/mei/mei-amt-version.c:443:21: note: 'acmd.fd' was declared here
>       struct amt_host_if acmd;
>                          ^
> 
> GCC is correct. See, the call chain that GCC detects must be
>     main()
>         amt_host_if_init()
>             mei_init()
>                 mei_deinit()
> 
> But when we enter mei_deinit() struct amt_host_if acmd is still
> unitialized. That makes the test for (effectively) amt_host_if->mei_cl->fd
> bogus.
> 
> But it turns out that call of mei_deinit() isn't needed at all. All of
> the members of mei_cl will be set later in mei_init() and none will be
> used before they are set. So we can simply drop this call of
> mei_deinit().
> 
> Signed-off-by: Paul Bolle <pebolle@...cali.nl>

Builds without warning for me.

Acked-by: David Howells <dhowells@...hat.com>
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