linux-kernel - Re: [PATCH] Cleanup libata HPA support

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Date:	Tue, 08 May 2007 09:44:52 -0400
From:	Mark Lord <liml@....ca>
To:	Ben Collins <ben.collins@...ntu.com>
Cc:	linux-kernel@...r.kernel.org, alan@...rguk.ukuu.org.uk,
	Kyle McMartin <kyle@...ntu.com>, linux-ide@...r.kernel.org
Subject: Re: [PATCH] Cleanup libata HPA support

Ben Collins wrote:
..
>  static u64 ata_tf_to_lba48(struct ata_taskfile *tf)
>  {
> -	u64 sectors = 0;
> +	u64 sectors;
> +	u32 high, low;
>  
> -	sectors |= ((u64)(tf->hob_lbah & 0xff)) << 40;
> -	sectors |= ((u64)(tf->hob_lbam & 0xff)) << 32;
> -	sectors |= (tf->hob_lbal & 0xff) << 24;
> -	sectors |= (tf->lbah & 0xff) << 16;
> -	sectors |= (tf->lbam & 0xff) << 8;
> -	sectors |= (tf->lbal & 0xff);
> +	high = (tf->hob_lbah << 16) |
> +	       (tf->hob_lbam <<  8) |
> +		tf->hob_lbal;
> +	low  = (tf->lbah << 16) |
> +	       (tf->lbam <<  8) |
> +		tf->lbal;
>  
> -	return ++sectors;
> +	sectors = ((u64)high << 24) | low;
> +
> +	return sectors + 1;
>  }

Ben, I very much prefer the fixed version of this function
as implemented by the patch above.

But.. is the original code actually broken, or just messy?

Cheers

-
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