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From: David Brownell <david-b@pacbell.net>
To: Wolfgang =?iso-8859-1?q?M=FCes?= <wolfgang.mues@auerswald.de>
Subject: Re: [PATCH 5/7] mmc_spi: allow higher timeouts for SPI mode
Date: Wed, 11 Mar 2009 12:17:42 -0800
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Cc: "Matt Fleming" <matt@console-pimps.org>,
       "Pierre Ossman" <drzeus@drzeus.cx>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       "Mike Frysinger" <vapier.adi@gmail.com>, linux-kernel@vger.kernel.org
References: <20090311154605.GD1475@console-pimps.org> <200903111714.15911.wolfgang.mues@auerswald.de>
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On Wednesday 11 March 2009, Wolfgang M?es wrote:
> > Is there a reason that you didn't implement this with msleep()
> > as was noted in the comment above the timeout?
> 
> Yes. msleep() is a busy waiting. It is implemented in terms of usleep(),
> which is also busy waiting. The old comment is wrong.

I think you're confused.  A *delay() call will busy-wait.
But a *sleep() call like msleep() will schedule.

(These speed concerns apply primarily to patch #6, not
this one ...)

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