linux-kernel - Re: [PATCH] drm/radeon: Fix an always-false-comparison

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Message-ID: <AANLkTiniutXFx3rtdSx+ZcicGDO_NXqUPv=63kPV-BNU@mail.gmail.com>
Date:	Sat, 2 Apr 2011 09:51:17 -0400
From:	Alex Deucher <alexdeucher@...il.com>
To:	"'Liu Yuan" <namei.unix@...il.com>, '@...edesktop.org
Cc:	David Airlie <airlied@...ux.ie>, Liu Yuan <tailai.ly@...bao.com>,
	open list <linux-kernel@...r.kernel.org>,
	"open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/radeon: Fix an always-false-comparison

On Fri, Apr 1, 2011 at 1:12 AM, 'Liu Yuan <namei.unix@...il.com> wrote:
> From: Liu Yuan <tailai.ly@...bao.com>
>
> In the function atom_op_delay() of drivers/gpu/drm/radeon/atom.c,
> the comparison performed in the udelay() is always false due to
> that the unsigned-char is compared to an integer 20000.
>

nack.  the delay count is only an 8 bit field.

Alex

> Signed-off-by: Liu Yuan <tailai.ly@...bao.com>
> ---
>  drivers/gpu/drm/radeon/atom.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/atom.c b/drivers/gpu/drm/radeon/atom.c
> index 258fa5e..e248211 100644
> --- a/drivers/gpu/drm/radeon/atom.c
> +++ b/drivers/gpu/drm/radeon/atom.c
> @@ -648,7 +648,7 @@ static void atom_op_compare(atom_exec_context *ctx, int *ptr, int arg)
>
>  static void atom_op_delay(atom_exec_context *ctx, int *ptr, int arg)
>  {
> -       uint8_t count = U8((*ptr)++);
> +       uint32_t count = U32((*ptr)++);
>        SDEBUG("   count: %d\n", count);
>        if (arg == ATOM_UNIT_MICROSEC)
>                udelay(count);
> --
> 1.7.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
>
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