[PATCH RFC v4 4/6] iio: osf: add stream parser

[Jinseob Kim]

Keep the parser focused on frame assembly.

Let the core decode complete frames once.

Signed-off-by: Jinseob Kim <kimjinseob88@xxxxxxxxx>
---
 drivers/iio/opensensorfusion/osf_stream.c | 38 ++++++-----------------
 1 file changed, 9 insertions(+), 29 deletions(-)

diff --git a/drivers/iio/opensensorfusion/osf_stream.c b/drivers/iio/opensensorfusion/osf_stream.c
index a2739c987..957f73716 100644
--- a/drivers/iio/opensensorfusion/osf_stream.c
+++ b/drivers/iio/opensensorfusion/osf_stream.c
@@ -62,8 +62,6 @@ static size_t osf_stream_discard_to_magic(struct osf_stream *stream)
 
 static int osf_stream_process(struct osf_stream *stream)
 {
-	struct osf_frame frame;
-	size_t decoded_len;
 	size_t discarded;
 	size_t frame_len;
 	u32 payload_len;
@@ -82,10 +80,8 @@ static int osf_stream_process(struct osf_stream *stream)
 		if (!stream->len)
 			break;
 
-		if (stream->len < OSF_FRAME_HEADER_LEN) {
-			stream->stats.partial_frames++;
+		if (stream->len < OSF_FRAME_HEADER_LEN)
 			break;
-		}
 
 		if (get_unaligned_le16(stream->buf + 6) !=
 		    OSF_FRAME_HEADER_LEN) {
@@ -106,34 +102,18 @@ static int osf_stream_process(struct osf_stream *stream)
 		}
 
 		frame_len = OSF_FRAME_HEADER_LEN + payload_len + OSF_FRAME_CRC_LEN;
-		if (stream->len < frame_len) {
-			stream->stats.partial_frames++;
+		if (stream->len < frame_len)
 			break;
-		}
-
-		ret = osf_protocol_decode_frame(stream->buf, frame_len, &frame,
-						&decoded_len);
-		if (ret) {
-			if (ret == -EBADMSG)
-				stream->stats.bad_crc_frames++;
-			stream->stats.dropped_bytes++;
-			osf_stream_drop_invalid_head(stream);
-			if (!first_err)
-				first_err = ret;
-			continue;
-		}
-
-		if (decoded_len != frame_len) {
-			stream->stats.dropped_bytes++;
-			osf_stream_drop_invalid_head(stream);
-			if (!first_err)
-				first_err = -EMSGSIZE;
-			continue;
-		}
 
 		ret = osf_core_receive_frame(stream->osf, stream->buf, frame_len);
 		if (ret) {
-			osf_stream_discard(stream, frame_len);
+			if (ret == -EBADMSG) {
+				stream->stats.bad_crc_frames++;
+				stream->stats.dropped_bytes++;
+				osf_stream_drop_invalid_head(stream);
+			} else {
+				osf_stream_discard(stream, frame_len);
+			}
 			if (!first_err)
 				first_err = ret;
 			continue;
-- 
2.43.0