linux-kernel - Re: [PATCH 5/7] mmc_spi: allow higher timeouts for SPI mode

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Date:	Wed, 11 Mar 2009 12:17:42 -0800
From:	David Brownell <david-b@...bell.net>
To:	Wolfgang Mües <wolfgang.mues@...rswald.de>
Cc:	"Matt Fleming" <matt@...sole-pimps.org>,
	"Pierre Ossman" <drzeus@...eus.cx>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Mike Frysinger" <vapier.adi@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/7] mmc_spi: allow higher timeouts for SPI mode

On Wednesday 11 March 2009, Wolfgang Mües 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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