From b3a686f47a3615fcfec0a01c4103c50bb9621369 Mon Sep 17 00:00:00 2001
From: Cornelia Huck <cornelia.huck@de.ibm.com>
Date: Mon, 14 Jul 2008 09:58:48 +0200
Subject: [S390] cio: Base message subchannel handling.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---
 drivers/s390/cio/css.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'drivers/s390/cio/css.c')

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index bc3a8e4a49f..062716cf0f0 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -332,6 +332,8 @@ int css_sch_is_valid(struct schib *schib)
 {
 	if ((schib->pmcw.st == SUBCHANNEL_TYPE_IO) && !schib->pmcw.dnv)
 		return 0;
+	if ((schib->pmcw.st == SUBCHANNEL_TYPE_MSG) && !schib->pmcw.w)
+		return 0;
 	return 1;
 }
 EXPORT_SYMBOL_GPL(css_sch_is_valid);
-- 
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