ALSA: compress: fix the states to check for allowing read

for reading compressed data, we need to allow when we are paused, draining or
stopped.
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Cc: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Cc: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/compress_offload.c

@@ -311,8 +311,16 @@ static ssize_t snd_compr_read(struct file *f, char __user *buf,
 	stream = &data->stream;
 	mutex_lock(&stream->device->lock);
 
-	/* read is allowed when stream is running */
-	if (stream->runtime->state != SNDRV_PCM_STATE_RUNNING) {
+	/* read is allowed when stream is running, paused, draining and setup
+	 * (yes setup is state which we transition to after stop, so if user
+	 * wants to read data after stop we allow that)
+	 */
+	switch (stream->runtime->state) {
+	case SNDRV_PCM_STATE_OPEN:
+	case SNDRV_PCM_STATE_PREPARED:
+	case SNDRV_PCM_STATE_XRUN:
+	case SNDRV_PCM_STATE_SUSPENDED:
+	case SNDRV_PCM_STATE_DISCONNECTED:
 		retval = -EBADFD;
 		goto out;
 	}