linux-kernel - Re: [PATCH] wan: time

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Date:	Sun, 25 May 2014 10:58:52 -0700
From:	Joe Perches <joe@...ches.com>
To:	Manuel Schölling <manuel.schoelling@....de>
Cc:	kevin.curtis@...site.co.uk, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] wan: time_before()

On Sun, 2014-05-25 at 19:32 +0200, Manuel Schölling wrote:
> To be future-proof and for better readability the time comparisons are
> modified to use time_before() instead of plain, error-prone math.

Sensible change, but it seems these should be
udelay(some_constant) instead of a a rather
variable time wait based on a system/config
defined jiffies.

Kevin?

> diff --git a/drivers/net/wan/farsync.c b/drivers/net/wan/farsync.c
[]
> @@ -697,14 +697,14 @@ fst_cpureset(struct fst_card_info *card)
>  		 * We are delaying here to allow the 9054 to reset itself
>  		 */
>  		j = jiffies + 1;
> -		while (jiffies < j)
> +		while (time_before(jiffies, j))
>  			/* Do nothing */ ;
>  		outw(0x240f, card->pci_conf + CNTRL_9054 + 2);
>  		/*
>  		 * We are delaying here to allow the 9054 to reload its eeprom
>  		 */
>  		j = jiffies + 1;
> -		while (jiffies < j)
> +		while (time_before(jiffies, j))
>  			/* Do nothing */ ;
>  		outw(0x040f, card->pci_conf + CNTRL_9054 + 2);
>  



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