linux-kernel - Re: [PATCH] i915, debugfs: Fix uninitialized warning

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Date:	Thu, 21 Nov 2013 17:10:30 +0100
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, Borislav Petkov <bp@...e.de>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	David Airlie <airlied@...ux.ie>,
	intel-gfx@...ts.freedesktop.org,
	DRI mailing list <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] i915, debugfs: Fix uninitialized warning

On Thu, Nov 21, 2013 at 4:49 PM, Borislav Petkov <bp@...en8.de> wrote:
> From: Borislav Petkov <bp@...e.de>
>
> gcc complains that:
>
> drivers/gpu/drm/i915/i915_debugfs.c: In function ‘display_crc_ctl_write’:
> drivers/gpu/drm/i915/i915_debugfs.c:2393:2: warning: ‘val’ may be used uninitialized in this function [-Wuninitialized]
> drivers/gpu/drm/i915/i915_debugfs.c:2350:6: note: ‘val’ was declared here
>
> but it can't see that we're going to use val only in the success case.
> So shut it up.
>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: David Airlie <airlied@...ux.ie>
> Cc: intel-gfx@...ts.freedesktop.org
> Cc: dri-devel@...ts.freedesktop.org
> Signed-off-by: Borislav Petkov <bp@...e.de>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index 6ed45a984230..1191aa47adc9 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2347,7 +2347,7 @@ static int pipe_crc_set_source(struct drm_device *dev, enum pipe pipe,
>  {
>         struct drm_i915_private *dev_priv = dev->dev_private;
>         struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[pipe];
> -       u32 val;
> +       u32 val = 0; /* shut up gcc */

Wouldn't it be better to use uninitialized_var() here?

>         int ret;
>
>         if (pipe_crc->source == source)
> --
> 1.8.4
>
> --
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-- 
Thanks,
//richard
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