Re: [patch ide-dev 8/9] make ide_task_ioctl() use REQ_DRIVE_TASKFILE

[Tejun Heo <htejun@gmail.com>]

 Hello, Bartlomiej.

 This patch should be modified to use flagged taskfile if the
task_end_request_fix patch isn't applied.  As non-flagged taskfile
won't return valid result registers, TASK ioctl users won't get the
correct register output.

 IMHO, this flag-to-get-result-registers thing is way too subtle.  How
about keeping old behavior by just not copying out register outputs in
ide_taskfile_ioctl() in applicable cases instead of not reading
registers when ending commands?  That is, unless there's some
noticeable performance impacts I'm not aware of.

 Thanks.

On Thu, Feb 24, 2005 at 03:48:33PM +0100, Bartlomiej Zolnierkiewicz wrote:
> 
> ide_task_ioctl() rewritten to use taskfile transport.
> This is the last user of REQ_DRIVE_TASK.
> 
> bart: ported to recent IDE changes by me
> 
> Signed-off-by: Tejun Heo <htejun@gmail.com>
> 
> diff -Nru a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
> --- a/drivers/ide/ide-taskfile.c	2005-02-24 15:30:02 +01:00
> +++ b/drivers/ide/ide-taskfile.c	2005-02-24 15:30:02 +01:00
> @@ -777,30 +777,42 @@
>  	return err;
>  }
> 
> -static int ide_wait_cmd_task(ide_drive_t *drive, u8 *buf)
> -{
> -	struct request rq;
> -
> -	ide_init_drive_cmd(&rq);
> -	rq.flags = REQ_DRIVE_TASK;
> -	rq.buffer = buf;
> -	return ide_do_drive_cmd(drive, &rq, ide_wait);
> -}
> -
> -/*
> - * FIXME : this needs to map into at taskfile. <andre@linux-ide.org>
> - */
> -int ide_task_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
> +int ide_task_ioctl(ide_drive_t *drive, unsigned int cmd, unsigned long arg)
>  {
>  	void __user *p = (void __user *)arg;
> -	int err = 0;
> -	u8 args[7], *argbuf = args;
> -	int argsize = 7;
> +	int err;
> +	u8 args[7];
> +	ide_task_t task;
> +	struct ata_taskfile *tf = &task.tf;
> 
>  	if (copy_from_user(args, p, 7))
>  		return -EFAULT;
> -	err = ide_wait_cmd_task(drive, argbuf);
> -	if (copy_to_user(p, argbuf, argsize))
> +
> +	memset(&task, 0, sizeof(task));
> +
> +	tf->command	= args[0];
> +	tf->feature	= args[1];
> +	tf->nsect	= args[2];
> +	tf->lbal	= args[3];
> +	tf->lbam	= args[4];
> +	tf->lbah	= args[5];
> +	tf->device	= args[6];
> +
> +	task.command_type = IDE_DRIVE_TASK_NO_DATA;
> +	task.data_phase = TASKFILE_NO_DATA;
> +	task.handler = &task_no_data_intr;
> +
> +	err = ide_diag_taskfile(drive, &task, 0, NULL);
> +
> +	args[0] = tf->command;
> +	args[1] = tf->feature;
> +	args[2] = tf->nsect;
> +	args[3] = tf->lbal;
> +	args[4] = tf->lbam;
> +	args[5] = tf->lbah;
> +	args[6] = tf->device;
> +
> +	if (copy_to_user(p, args, 7))
>  		err = -EFAULT;
>  	return err;
>  }

-- 
tejun