[PATCH 4/4] ALSA: firewire-lib: use protocol error when detecting wrong value in CIP header

[Takashi Sakamoto <o-takashi@sakamocchi.jp>]

When detecting zero in 'dbs' field of CIP header, this packet streaming
should be aborted because of avoiding division-by-zero. This is an error
in an aspect of IEC 61883-1, thus protocol error.

This commit use EPROTO instead of EIO. Actually, the returned value is
not used for userspace and this commit has no effect.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
---
 sound/firewire/amdtp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
index 93cf93a..2b3e8b1 100644
--- a/sound/firewire/amdtp.c
+++ b/sound/firewire/amdtp.c
@@ -726,7 +726,7 @@ static int handle_in_packet(struct amdtp_stream *s,
 			dev_err(&s->unit->device,
 				"Detect invalid value in dbs field: %08X\n",
 				cip_header[0]);
-			return -EIO;
+			return -EPROTO;
 		}
 		if (s->flags & CIP_WRONG_DBS)
 			data_block_quadlets = s->data_block_quadlets;
-- 
2.1.4