From: David Brownell <david-b@pacbell.net>
To: "Wolfgang Mües" <wolfgang.mues@auerswald.de>
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
Subject: Re: [PATCH 5/7] mmc_spi: allow higher timeouts for SPI mode
Date: Wed, 11 Mar 2009 12:17:42 -0800 [thread overview]
Message-ID: <200903111317.42696.david-b@pacbell.net> (raw)
In-Reply-To: <200903111714.15911.wolfgang.mues@auerswald.de>
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 ...)
next prev parent reply other threads:[~2009-03-11 20:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-11 13:28 [PATCH 5/7] mmc_spi: allow higher timeouts for SPI mode Wolfgang Mües
2009-03-11 14:02 ` Matt Fleming
2009-03-11 14:55 ` Wolfgang Mües
2009-03-11 15:46 ` Matt Fleming
2009-03-11 16:14 ` Wolfgang Mües
2009-03-11 20:17 ` David Brownell [this message]
2009-03-12 8:16 ` Wolfgang Mües
2009-03-11 20:15 ` David Brownell
2009-03-15 11:27 ` Pierre Ossman
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