[PATCH] emu10k1: don't bother to invalidate cache for the extra voice

[PATCH] emu10k1: don't bother to invalidate cache for the extra voice

[Lee Revell]

Since the extra voice is only used to generate the period interrupts and
is always silent, I don't see why we need to invalidate its cache. 
Apparently the author of the driver felt the same way.  Latency tracing
shows that this can shave 20 usecs off the 120 usecs required for
startup and xrun recovery.

Lee

--- alsa-kernel/pci/emu10k1/emupcm.c~	2004-07-14 12:14:54.000000000 -0400
+++ alsa-kernel/pci/emu10k1/emupcm.c	2004-08-27 01:20:05.000000000 -0400
@@ -574,7 +574,6 @@
 	spin_lock(&emu->reg_lock);
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
-		snd_emu10k1_playback_invalidate_cache(emu, epcm->extra);	/* do we need this? */
 		snd_emu10k1_playback_invalidate_cache(emu, epcm->voices[0]);
 		/* follow thru */
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:




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