[ALSA] soc - Fix s3c24xx-i2s LR sync while timer ticks are disabled

When timer ticks are disabled when calling
sound/soc/s3c24xx/s3c24xx-i2s.c:s3c24xx_snd_lrsync
and the LR signal never happens, we loop forever.
This has been observed in the following call chain:
snd_pcm_common_ioctl1 -> snd_pcm_action_lock_irq ->
snd_pcm_action_single
 -> snd_pcm_do_resume -> soc_pcm_trigger -> s3c24xx_i2s_trigger

The patch below changes the timeout mechanism to use udelay, which
doesn't need timer ticks.
Signed-off-by: NWerner Almesberger <werner@openmoko.org>
Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NJaroslav Kysela <perex@perex.cz>

sound/soc/s3c24xx/s3c24xx-i2s.c

@@ -175,7 +175,7 @@ static void s3c24xx_snd_rxctrl(int on)
 static int s3c24xx_snd_lrsync(void)
 {
 	u32 iiscon;
-	unsigned long timeout = jiffies + msecs_to_jiffies(5);
+	int timeout = 50; /* 5ms */
 
 	DBG("Entered %s\n", __func__);
 
@@ -184,8 +184,9 @@ static int s3c24xx_snd_lrsync(void)
 		if (iiscon & S3C2410_IISCON_LRINDEX)
 			break;
 
-		if (time_after(jiffies, timeout))
+		if (!timeout--)
 			return -ETIMEDOUT;
+		udelay(100);
 	}
 
 	return 0;