linux-kernel - Re: [PATCH 12/18] ide: use ->tf_load in actual_try_to

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Date:	Sat, 21 Jun 2008 21:10:30 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/18] ide: use ->tf_load in actual_try_to_identify()

On Saturday 21 June 2008, Sergei Shtylyov wrote:
> Hello.
> 
> Bartlomiej Zolnierkiewicz wrote:
> > Convert actual_try_to_identify() to use ->tf_load instead of ->OUTB.
> >
> > There should be no functional changes caused by this patch.
> >
> > Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> >   
> [...]
> > Index: b/drivers/ide/ide-probe.c
> > ===================================================================
> > --- a/drivers/ide/ide-probe.c
> > +++ b/drivers/ide/ide-probe.c
> > @@ -290,9 +290,15 @@ static int actual_try_to_identify (ide_d
> >  	/* set features register for atapi
> >  	 * identify command to be sure of reply
> >  	 */
> > -	if ((cmd == WIN_PIDENTIFY))
> > -		/* disable dma & overlap */
> > -		hwif->OUTB(0, io_ports->feature_addr);
> > +	if (cmd == WIN_PIDENTIFY) {
> > +		ide_task_t task;
> > +
> > +		memset(&task, 0, sizeof(task));
> > +		/* disable DMA & overlap */
> > +		task.tf_flags = IDE_TFLAG_OUT_FEATURE;
> > +
> > +		drive->hwif->tf_load(drive, &task);
> > +	}
> >   
> 
>    Eww, this is bulky but should be a part of your plan to switch to 
> tf_load() method...

Yes on both matters:

- It is a part of The Grand Plan. ;)

- I also don't like the small increase of complexity but these changes
  make the core code completely independent of the hardware I/O registers
  (allowing any taskfile transport method).

PS Thanks for reviewing these patches.

Bart
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