linux-kernel - Re: [PATCH 19/19] ide: use PIO/MMIO operations directly where possible

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Message-ID: <20070112100641.02858876@localhost.localdomain>
Date:	Fri, 12 Jan 2007 10:06:41 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-ide@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 19/19] ide: use PIO/MMIO operations directly where
 possible

On Fri, 12 Jan 2007 05:28:07 +0100
Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:

> [PATCH] ide: use PIO/MMIO operations directly where possible
> 
> This results in smaller/faster/simpler code and allows future optimizations.
> Also remove no longer needed ide[_mm]_{inl,outl}() and ide_hwif_t.{INL,OUTL}.
> 
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>

> --- a.orig/drivers/ide/ide-dma.c
> +++ a/drivers/ide/ide-dma.c
> @@ -565,7 +565,10 @@ int ide_dma_setup(ide_drive_t *drive)
>  	}
>  
>  	/* PRD table */
> -	hwif->OUTL(hwif->dmatable_dma, hwif->dma_prdtable);
> +	if (hwif->mmio == 2)
> +		writel(hwif->dmatable_dma, (void __iomem *)hwif->dma_prdtable);
> +	else
> +		outl(hwif->dmatable_dma, hwif->dma_prdtable);


This should simply be if (hwif->mmio)

mmio = 1 is still used by some amiga and other oddments and indicates
mmio in old form. I don't think this causes a bug as they don't use the
DMA layer, but its a bug waiting to happen if the mmio==1 case doesn't
get handled correctly or BUG()

Alan
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