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

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

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.