[PATCH v3 7/7] ALSA: seq: Don't lose partial read failure

[Takashi Iwai <tiwai@suse.de>]

snd_seq_read() returns an error even if one or more events have been
successfully read before the error (except for -EAGAIN case), but this
rather doesn't follow the POSIX standard that wants the processed
bytes.  Change the behavior to return the processed bytes when it's
positive, instead.

Reported-by: Sashiko <sashiko-bot@kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/core/seq/seq_clientmgr.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/core/seq/seq_clientmgr.c b/sound/core/seq/seq_clientmgr.c
index ba5619d0b0b0..0711a9e23b5f 100644
--- a/sound/core/seq/seq_clientmgr.c
+++ b/sound/core/seq/seq_clientmgr.c
@@ -480,11 +480,11 @@ static ssize_t snd_seq_read(struct file *file, char __user *buf, size_t count,
 	if (err < 0) {
 		if (cell)
 			snd_seq_fifo_cell_putback(fifo, cell);
-		if (err == -EAGAIN && result > 0)
-			err = 0;
 	}
 
-	return (err < 0) ? err : result;
+	if (result > 0)
+		return result;
+	return err < 0 ? err : 0;
 }
 
 
-- 
2.55.0