[PATCH linux dev-4.10 v4 14/31] drivers: fsi: SBEFIFO: check for xfr complete in read wait_event

[Eddie James <eajames@linux.vnet.ibm.com>]

From: "Edward A. James" <eajames@us.ibm.com>

We should check to see if the XFR is complete, not just for a failure
or for available data. If we hit EOT without getting more data, we may
wait forever.

Signed-off-by: Edward A. James <eajames@us.ibm.com>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
---
 drivers/fsi/fsi-sbefifo.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/fsi/fsi-sbefifo.c b/drivers/fsi/fsi-sbefifo.c
index 9b560ec..5d73437 100644
--- a/drivers/fsi/fsi-sbefifo.c
+++ b/drivers/fsi/fsi-sbefifo.c
@@ -541,10 +541,15 @@ static bool sbefifo_read_ready(struct sbefifo *sbefifo,
 			       struct sbefifo_client *client, size_t *n,
 			       size_t *ret)
 {
+	struct sbefifo_xfr *xfr = list_first_entry_or_null(&client->xfrs,
+							   struct sbefifo_xfr,
+							   client);
+
 	*n = sbefifo_buf_nbreadable(&client->rbuf);
 	*ret = READ_ONCE(sbefifo->rc);
 
-	return *ret || *n;
+	return *ret || *n ||
+		(xfr && test_bit(SBEFIFO_XFR_COMPLETE, &xfr->flags));
 }
 
 static ssize_t sbefifo_read_common(struct sbefifo_client *client,
-- 
1.8.3.1