[PATCH] Improve behaviour of Dreamcast aica ALSA driver in poor resource conditions

["Adrian McMenamin" <adrianmcmenamin@gmail.com>]

This patch stops the driver from crashing in certain situations (eg if
the network fails when NFS mounted), please apply.

Signed-off by: Adrian McMenamin <adrian@mcmen.demon.co.uk>

--- alsa-kernel/sh/aica.c	2007-06-23 15:25:55.000000000 +0100
+++ linux-2.6.21/sound/sh/aica.c	2007-07-03 22:28:16.000000000 +0100
@@ -366,7 +366,9 @@
				 *substream)
{
	struct snd_card_aica *dreamcastcard = substream->pcm->private_data;
+	flush_workqueue(aica_queue);
	del_timer(&dreamcastcard->timer);
+	aica_chn_halt();
	kfree(dreamcastcard->channel);
	spu_disable();
	return 0;
@@ -402,16 +404,11 @@
static int snd_aicapcm_pcm_trigger(struct snd_pcm_substream
				   *substream, int cmd)
{
-	struct snd_card_aica *dreamcastcard;
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		spu_begin_dma(substream);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
-		dreamcastcard = substream->pcm->private_data;
-		if (dreamcastcard->timer.data)
-			del_timer(&dreamcastcard->timer);
-		aica_chn_halt();
		break;
	default:
		return -EINVAL;
-
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