netdev - Re: [PATCH] gianfar: Wait for both RX and TX to stop

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Date:	Tue, 20 Apr 2010 10:59:57 -0500
From:	Timur Tabi <timur.tabi@...il.com>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	Andy Fleming <afleming@...escale.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH] gianfar: Wait for both RX and TX to stop

On Tue, Apr 20, 2010 at 10:01 AM, Timur Tabi <timur.tabi@...il.com> wrote:
> On Mon, Apr 19, 2010 at 11:43 PM, Kumar Gala <galak@...nel.crashing.org> wrote:
>
>> spin_event_timeout doesn't make sense for this.  The patch is fine.
>
> Can you please elaborate on that?  I don't understand why you think
> that.  spin_event_timeout() takes an expression and a timeout, and
> loops over the expression calling cpu_relax(), just like this loop
> does.

I haven't tested it, but I think this should work:

	spin_event_timeout((gfar_read(&regs->ievent) &
		(IEVENT_GRSC | IEVENT_GTSC)) ==
		(IEVENT_GRSC | IEVENT_GTSC), -1, 0);

Ideally, Andy should use a timeout value other than -1, and then test
the result like this:

	u32 ret;

	ret = spin_event_timeout((gfar_read(&regs->ievent) &
		(IEVENT_GRSC | IEVENT_GTSC)) ==
		(IEVENT_GRSC | IEVENT_GTSC), 1000, 0);

	if (!ret)
		/* timeout has occurred */

-- 
Timur Tabi
Linux kernel developer at Freescale
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