linux-kernel - Re: [Outreachy kernel] [PATCH] staging: nvec: cleanup USLEEP

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Date:   Thu, 2 Mar 2017 15:36:29 +0100 (CET)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     simran singhal <singhalsimran0@...il.com>
cc:     marvin24@....de, gregkh@...uxfoundation.org,
        ac100@...ts.launchpad.net, linux-tegra@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com
Subject: Re: [Outreachy kernel] [PATCH] staging: nvec: cleanup USLEEP_RANGE
 checkpatch checks



On Thu, 2 Mar 2017, simran singhal wrote:

> Resolve strict checkpatch USLEEP_RANGE checks by converting delays and
> sleeps as described in ./Documentation/timers/timers-howto.txt.
>
> CHECK: usleep_range is preferred over udelay; see Documentation/
> timers/timers-howto.txt
>
> Signed-off-by: simran singhal <singhalsimran0@...il.com>
> ---
>  drivers/staging/nvec/nvec.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/nvec/nvec.c b/drivers/staging/nvec/nvec.c
> index c1feccf..cd35e64 100644
> --- a/drivers/staging/nvec/nvec.c
> +++ b/drivers/staging/nvec/nvec.c
> @@ -631,7 +631,7 @@ static irqreturn_t nvec_interrupt(int irq, void *dev)
>  		break;
>  	case 2:		/* first byte after command */
>  		if (status == (I2C_SL_IRQ | RNW | RCVD)) {
> -			udelay(33);
> +			usleep_range(33, 100);

How did you choose the upper limit.

I believe that Greg previously suggested not to make these changes if you
have no way to test them.

julia


>  			if (nvec->rx->data[0] != 0x01) {
>  				dev_err(nvec->dev,
>  					"Read without prior read command\n");
> @@ -718,7 +718,7 @@ static irqreturn_t nvec_interrupt(int irq, void *dev)
>  	 * We experience less incomplete messages with this delay than without
>  	 * it, but we don't know why. Help is appreciated.
>  	 */
> -	udelay(100);
> +	usleep_range(100, 200);
>
>  	return IRQ_HANDLED;
>  }
> --
> 2.7.4
>
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