linux-kernel - Re: [PATCH] drm: omapdrm: silence unititialized variable warning

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Date:   Wed, 2 May 2018 11:59:33 +0300
From:   Tomi Valkeinen <tomi.valkeinen@...com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
CC:     David Airlie <airlied@...ux.ie>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] drm: omapdrm: silence unititialized variable warning

Hi,

On 18/04/18 17:29, Dan Carpenter wrote:
> Smatch complains that "area_free" could be used without being
> initialized.  This code is several years old and premusably works fine
> so this can't be a very serious bug.  But it's easy enough to silence
> the warning.  If "area_free" is false at the end of the function then
> we return -ENOMEM.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> diff --git a/drivers/gpu/drm/omapdrm/tcm-sita.c b/drivers/gpu/drm/omapdrm/tcm-sita.c
> index d7f7bc9f061a..817be3c41863 100644
> --- a/drivers/gpu/drm/omapdrm/tcm-sita.c
> +++ b/drivers/gpu/drm/omapdrm/tcm-sita.c
> @@ -90,7 +90,7 @@ static int l2r_t2b(u16 w, u16 h, u16 a, s16 offset,
>  {
>  	int i;
>  	unsigned long index;
> -	bool area_free;
> +	bool area_free = false;
>  	unsigned long slots_per_band = PAGE_SIZE / slot_bytes;
>  	unsigned long bit_offset = (offset > 0) ? offset / slot_bytes : 0;
>  	unsigned long curr_bit = bit_offset;
> 

Thanks, I've queued this for 4.17 fixes.

 Tomi

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