linux-kernel - RE: [PATCH v6] Staging: comedi: convert while loop to timeout in ni_mio

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Date:	Wed, 15 Jan 2014 18:48:32 +0000
From:	Hartley Sweeten <HartleyS@...ionengravers.com>
To:	Chase Southwood <chase.southwood@...oo.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:	"abbotti@....co.uk" <abbotti@....co.uk>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v6] Staging: comedi: convert while loop to timeout in
 ni_mio_common.c

On Wednesday, January 15, 2014 10:52 AM, Chase Southwood wrote:
> This patch for ni_mio_common.c changes out a while loop for a timeout,
> which is preferred.
>
> Signed-off-by: Chase Southwood <chase.southwood@...oo.com>
> ---
>
> 2: Changed from simple clean-up to swapping a timeout in for a while loop.
>
> 3: Removed extra counter variable, and added error checking.
>
> 4: No longer using counter variable, using jiffies instead.
>
> 5: udelay for 10u, instead of 1u.
>
> 6: Scrap udelay entirely, in favor of cpu_relax.  Include asm/processor.h
> in order to use cpu_relax.
>
>  drivers/staging/comedi/drivers/ni_mio_common.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/staging/comedi/drivers/ni_mio_common.c b/drivers/staging/comedi/drivers/ni_mio_common.c
> index 457b884..fe2f434 100644
> --- a/drivers/staging/comedi/drivers/ni_mio_common.c
> +++ b/drivers/staging/comedi/drivers/ni_mio_common.c
> @@ -55,6 +55,7 @@
>  #include <linux/interrupt.h>
>  #include <linux/sched.h>
>  #include <linux/delay.h>
> +#include <asm/processor.h>
>  #include "8255.h"
>  #include "mite.h"
>  #include "comedi_fc.h"
> @@ -687,12 +688,21 @@ static void ni_clear_ai_fifo(struct comedi_device *dev)
>  {
>  	const struct ni_board_struct *board = comedi_board(dev);
>  	struct ni_private *devpriv = dev->private;
> +	unsigned long timeout;
>  
>  	if (board->reg_type == ni_reg_6143) {
>  		/*  Flush the 6143 data FIFO */
>  		ni_writel(0x10, AIFIFO_Control_6143);	/*  Flush fifo */
>  		ni_writel(0x00, AIFIFO_Control_6143);	/*  Flush fifo */
> -		while (ni_readl(AIFIFO_Status_6143) & 0x10) ;	/*  Wait for complete */
> +		/*  Wait for complete */
> +		timeout = jiffies + msec_to_jiffies(500);

Did you build this?

I think you meant to use msecs_to_jiffies().

Regards,
Hartley

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