linux-kernel - Re: [PATCH] Fix a panic with 1M of shared memory, no GTT entries

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Date:	Wed, 28 Jan 2009 09:13:06 +0000 (GMT)
From:	Dave Airlie <airlied@...ux.ie>
To:	Lubomir Rintel <lkundrak@...sk>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, eric@...olt.net
Subject: Re: [PATCH] Fix a panic with 1M of shared memory, no GTT entries


> When GTT size is equal to amount of video memory, the amount of GTT
> entries is computed lower than zero, which is invalid and leads to
> off-by-one error in intel_i915_configure()
> 
> Originally posted here:
> http://bugzilla.kernel.org/show_bug.cgi?id=12539
> http://bugzilla.redhat.com/show_bug.cgi?id=445592

cc'ed Intel agp knowledge.

Dave.

> 
> Signed-Off-By: Lubomir Rintel <lkundrak@...sk>
> ---
>  drivers/char/agp/intel-agp.c |    8 +++++---
>  1 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
> index c771418..4373adb 100644
> --- a/drivers/char/agp/intel-agp.c
> +++ b/drivers/char/agp/intel-agp.c
> @@ -633,13 +633,15 @@ static void intel_i830_init_gtt_entries(void)
>  			break;
>  		}
>  	}
> -	if (gtt_entries > 0)
> +	if (gtt_entries > 0) {
>  		dev_info(&agp_bridge->dev->dev, "detected %dK %s memory\n",
>  		       gtt_entries / KB(1), local ? "local" : "stolen");
> -	else
> +		gtt_entries /= KB(4);
> +	} else {
>  		dev_info(&agp_bridge->dev->dev,
>  		       "no pre-allocated video memory detected\n");
> -	gtt_entries /= KB(4);
> +		gtt_entries = 0;
> +	}
>  
>  	intel_private.gtt_entries = gtt_entries;
>  }
> 
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