linux-kernel - Re: [PATCH 46/64] ide: add drive->pio

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Date:	Tue, 19 Jan 2010 16:09:46 +0100
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 46/64] ide: add drive->pio_mode field

On Monday 18 January 2010 08:28:22 pm Sergei Shtylyov wrote:
> Bartlomiej Zolnierkiewicz wrote:
> 
> > From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> > Subject: [PATCH] ide: add drive->pio_mode field
> >
> > Add pio_mode field to ide_drive_t matching pio_mode field used in
> > struct ata_device.
> >
> > The validity of the field is restricted to ->set_pio_mode method
> > only currently in IDE subsystem.
> >
> > Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> > ---
> >  drivers/ide/ide-devsets.c   |    2 ++
> >  drivers/ide/ide-probe.c     |    2 ++
> >  drivers/ide/ide-xfer-mode.c |    3 +++
> >  include/linux/ide.h         |    1 +
> >  4 files changed, 8 insertions(+)
> >
> > Index: b/drivers/ide/ide-devsets.c
> > ===================================================================
> > --- a/drivers/ide/ide-devsets.c
> > +++ b/drivers/ide/ide-devsets.c
> > @@ -105,6 +105,8 @@ static int set_pio_mode(ide_drive_t *dri
> >  		return -ENOSYS;
> >  
> >  	if (set_pio_mode_abuse(drive->hwif, arg)) {
> > +		drive->pio_mode = arg + XFER_PIO_0;
> > +
> >   
> 
>    Er, didn't understand this... these 'arg' values are not really PIO 
> modes, no?

In the usual case they are and a few 'special' ->set_pio_mode implementations
will extract the desired 'arg' value just fine by doing '- XFER_PIO_0'..

--
Bartlomiej Zolnierkiewicz
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