From a55360df406cca797ac07d722688dd7ec29bf46e Mon Sep 17 00:00:00 2001
From: Cornelia Huck <cornelia.huck@de.ibm.com>
Date: Fri, 12 Oct 2007 16:11:20 +0200
Subject: [PATCH] [S390] cio: Disable channel path measurements on
 shutdown/reboot.

Make sure channel path measurements are disabled via a reboot notifier
since we cannot rely on userspace to disable it again after enabling
it. This is 1. clean and 2. makes sure that channel path measurements
do not stay enabled after a reboot not involving a subsystem reset
(which would lead to the channel subsystem scribbling onto random
memory).

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---
 drivers/s390/cio/css.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 08f6e7b6c999..5d83dd471461 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -13,6 +13,7 @@
 #include <linux/slab.h>
 #include <linux/errno.h>
 #include <linux/list.h>
+#include <linux/reboot.h>
 
 #include "css.h"
 #include "cio.h"
@@ -632,6 +633,29 @@ static int __init setup_css(int nr)
 	return 0;
 }
 
+static int css_reboot_event(struct notifier_block *this,
+			    unsigned long event,
+			    void *ptr)
+{
+	int ret, i;
+
+	ret = NOTIFY_DONE;
+	for (i = 0; i <= __MAX_CSSID; i++) {
+		struct channel_subsystem *css;
+
+		css = channel_subsystems[i];
+		if (css->cm_enabled)
+			if (chsc_secm(css, 0))
+				ret = NOTIFY_BAD;
+	}
+
+	return ret;
+}
+
+static struct notifier_block css_reboot_notifier = {
+	.notifier_call = css_reboot_event,
+};
+
 /*
  * Now that the driver core is running, we can setup our channel subsystem.
  * The struct subchannel's are created during probing (except for the
@@ -697,12 +721,17 @@ init_channel_subsystem (void)
 		if (ret)
 			goto out_file;
 	}
+	ret = register_reboot_notifier(&css_reboot_notifier);
+	if (ret)
+		goto out_pseudo;
 	css_init_done = 1;
 
 	ctl_set_bit(6, 28);
 
 	for_each_subchannel(__init_channel_subsystem, NULL);
 	return 0;
+out_pseudo:
+	device_unregister(&channel_subsystems[i]->pseudo_subchannel->dev);
 out_file:
 	device_remove_file(&channel_subsystems[i]->device,
 			   &dev_attr_cm_enable);
-- 
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