linux-kernel - Re: [PATCH] media: dvb_frontend: Fix uninitialized error in dvb_frontend_handle

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Date:   Thu, 16 Nov 2017 12:38:20 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] media: dvb_frontend: Fix uninitialized error in dvb_frontend_handle_ioctl()

On Thu, Nov 16, 2017 at 11:51 AM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> With gcc-4.1.2:
>
>     drivers/media/dvb-core/dvb_frontend.c: In function ‘dvb_frontend_handle_ioctl’:
>     drivers/media/dvb-core/dvb_frontend.c:2110: warning: ‘err’ may be used uninitialized in this function
>
> Indeed, there are 13 cases where err is used initialized if one of the
> dvb_frontend_ops is not implemented.
>
> Preinitialize err to -EOPNOTSUPP like before to fix this.
>
> Fixes: d73dcf0cdb95a47f ("media: dvb_frontend: cleanup ioctl handling logic")
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>

Good catch!

This one shows up on x86 allmdoconfig with gcc-4.5 or older but not gcc-4.6.

Acked-by: Arnd Bergmann <arnd@...db.de>