ALSA: Compress - dont use lock for all ioctls

Some simple ioctls like timsetamp query, capabities query can be done anytime
and should not be under the stream lock. Move these to
snd_compress_simple_iotcls() which is invoked without lock held.

While at it, improve readblity a bit by sprinkling some empty lines.

Change-Id: Icc8ffdadd565c635f6a95e7e5bdda76257f24ea3
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Eric Laurent <elaurent@google.com>
Git-commit: 6a44374b8b92e9946dc1e5c15c2a11003aa859b1
Git-repo: https://android.googlesource.com/kernel/msm
[dhakumar@codeaurora.org: resolved merge conflicts]
Signed-off-by: Dhananjay Kumar <dhakumar@codeaurora.org>

sound/core/compress_offload.c

@@ -780,6 +780,52 @@ static int snd_compr_partial_drain(struct snd_compr_stream *stream)
 	return snd_compress_wait_for_drain(stream);
 }
 
+static int snd_compress_simple_ioctls(struct file *file,
+				struct snd_compr_stream *stream,
+				unsigned int cmd, unsigned long arg)
+{
+	int retval = -ENOTTY;
+
+	switch (_IOC_NR(cmd)) {
+	case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
+		retval = put_user(SNDRV_COMPRESS_VERSION,
+				(int __user *)arg) ? -EFAULT : 0;
+		break;
+
+	case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
+		retval = snd_compr_get_caps(stream, arg);
+		break;
+
+	case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
+		retval = snd_compr_get_codec_caps(stream, arg);
+		break;
+
+
+	case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
+		retval = snd_compr_tstamp(stream, arg);
+		break;
+
+	case _IOC_NR(SNDRV_COMPRESS_AVAIL):
+		retval = snd_compr_ioctl_avail(stream, arg);
+		break;
+
+	/* drain and partial drain need special handling
+	 * we need to drop the locks here as the streams would get blocked on
+	 * the dsp to get drained. The locking would be handled in respective
+	 * function here
+	 */
+	case _IOC_NR(SNDRV_COMPRESS_DRAIN):
+		retval = snd_compr_drain(stream);
+		break;
+
+	case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
+		retval = snd_compr_partial_drain(stream);
+		break;
+	}
+
+	return retval;
+}
+
 static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 {
 	struct snd_compr_file *data = f->private_data;
@@ -791,59 +837,51 @@ static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 	stream = &data->stream;
 	if (snd_BUG_ON(!stream))
 		return -EFAULT;
+
 	mutex_lock(&stream->device->lock);
 	switch (_IOC_NR(cmd)) {
-	case _IOC_NR(SNDRV_COMPRESS_IOCTL_VERSION):
-		retval = put_user(SNDRV_COMPRESS_VERSION,
-				(int __user *)arg) ? -EFAULT : 0;
-		break;
-	case _IOC_NR(SNDRV_COMPRESS_GET_CAPS):
-		retval = snd_compr_get_caps(stream, arg);
-		break;
-	case _IOC_NR(SNDRV_COMPRESS_GET_CODEC_CAPS):
-		retval = snd_compr_get_codec_caps(stream, arg);
-		break;
 	case _IOC_NR(SNDRV_COMPRESS_SET_PARAMS):
 		retval = snd_compr_set_params(stream, arg);
 		break;
+
 	case _IOC_NR(SNDRV_COMPRESS_GET_PARAMS):
 		retval = snd_compr_get_params(stream, arg);
 		break;
+
 	case _IOC_NR(SNDRV_COMPRESS_SET_METADATA):
 		retval = snd_compr_set_metadata(stream, arg);
 		break;
+
 	case _IOC_NR(SNDRV_COMPRESS_GET_METADATA):
 		retval = snd_compr_get_metadata(stream, arg);
 		break;
-	case _IOC_NR(SNDRV_COMPRESS_TSTAMP):
-		retval = snd_compr_tstamp(stream, arg);
-		break;
-	case _IOC_NR(SNDRV_COMPRESS_AVAIL):
-		retval = snd_compr_ioctl_avail(stream, arg);
-		break;
+
 	case _IOC_NR(SNDRV_COMPRESS_PAUSE):
 		retval = snd_compr_pause(stream);
 		break;
+
 	case _IOC_NR(SNDRV_COMPRESS_RESUME):
 		retval = snd_compr_resume(stream);
 		break;
+
 	case _IOC_NR(SNDRV_COMPRESS_START):
 		retval = snd_compr_start(stream);
 		break;
+
 	case _IOC_NR(SNDRV_COMPRESS_STOP):
 		retval = snd_compr_stop(stream);
 		break;
-	case _IOC_NR(SNDRV_COMPRESS_DRAIN):
-		retval = snd_compr_drain(stream);
-		break;
-	case _IOC_NR(SNDRV_COMPRESS_PARTIAL_DRAIN):
-		retval = snd_compr_partial_drain(stream);
-		break;
+
 	case _IOC_NR(SNDRV_COMPRESS_NEXT_TRACK):
 		retval = snd_compr_next_track(stream);
 		break;
 
+	default:
+		mutex_unlock(&stream->device->lock);
+		return snd_compress_simple_ioctls(f, stream, cmd, arg);
+
 	}
+
 	mutex_unlock(&stream->device->lock);
 	return retval;
 }