On Tue, Jan 19, 2016 at 12:39:50PM -0500, John Snow wrote:
> Split apart the ide_transfer_stop function into two versions: one that
> interrupts and one that doesn't. The one that doesn't can be used to
> halt any PIO transfers that are in the DRQ phase. It will not halt
> any PIO transfers that are currently in the process of buffering data
> for the guest to read.
> 
> Signed-off-by: John Snow <jsnow@redhat.com>
> ---
>  hw/ide/core.c | 19 ++++++++++++++++---
>  1 file changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/hw/ide/core.c b/hw/ide/core.c
> index cf0b5ec..9bc8e58 100644
> --- a/hw/ide/core.c
> +++ b/hw/ide/core.c
> @@ -486,13 +486,26 @@ static void ide_cmd_done(IDEState *s)
>      }
>  }
>  
> -void ide_transfer_stop(IDEState *s)
> +static void ide_transfer_halt(IDEState *s, void(*etf)(IDEState *), bool notify)
>  {
> -    s->end_transfer_func = ide_transfer_stop;
> +    s->end_transfer_func = etf;

Please keep using full names so the code is easier to understand:
s/etc/end_transfer_func/