From 4ad42e4b114be4554f0d148f26541501442519c8 Mon Sep 17 00:00:00 2001
From: Jan Glauber <jang@linux.vnet.ibm.com>
Date: Wed, 23 Mar 2011 10:16:01 +0100
Subject: [PATCH] --- yaml --- r: 242489 b: refs/heads/master c:
 9a26513eb67ec4b2cb1744834076afad21b68aac h: refs/heads/master i:   242487:
 6e053b7686ad33c58bc03853b67cd6372ad0de0e v: v3

---
 [refs]                             | 2 +-
 trunk/drivers/s390/cio/qdio_main.c | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/[refs] b/[refs]
index 3a21426475a4..128bac83e748 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4cc69531f91dfa1668af5e9d8efe9e3bc7b64548
+refs/heads/master: 9a26513eb67ec4b2cb1744834076afad21b68aac
diff --git a/trunk/drivers/s390/cio/qdio_main.c b/trunk/drivers/s390/cio/qdio_main.c
index 5640c89cd9de..479c665e9e7c 100644
--- a/trunk/drivers/s390/cio/qdio_main.c
+++ b/trunk/drivers/s390/cio/qdio_main.c
@@ -1508,7 +1508,8 @@ int do_QDIO(struct ccw_device *cdev, unsigned int callflags,
 
 	if (irq_ptr->state != QDIO_IRQ_STATE_ACTIVE)
 		return -EBUSY;
-
+	if (!count)
+		return 0;
 	if (callflags & QDIO_FLAG_SYNC_INPUT)
 		return handle_inbound(irq_ptr->input_qs[q_nr],
 				      callflags, bufnr, count);