Re: [alsa-devel] [PATCH] Modify mpc5200 AC97 driver to use V9 of spin_event_timeout()

On Tue, May 26, 2009 at 9:12 PM, Timur Tabi timur@freescale.com wrote:

On Tue, May 26, 2009 at 8:01 PM, Jon Smirl jonsmirl@gmail.com wrote:

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Then why did you need to make your routine that calls cpu_relax()?

That gets called only if delay == 0.  udelay(0) is a no-op, so if the caller specifies no delay, then I need to manually call cpu_relax().

...

I don't know what goes on in the guts of HMT_low() and cpu_relax(), when you guys decide which one I should use let me know and I can adjust the patch.

Grant, I don't see any reason why "udelay(50)" is unacceptable.

It's not. See my last email.

g.