linux-kernel - [PATCH 10/28] Drivers: hv: Save and export negotiated vmbus version

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Date:	Sat,  1 Dec 2012 06:46:41 -0800
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, olaf@...fle.de, apw@...onical.com,
	jasowang@...hat.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH 10/28] Drivers: hv: Save and export negotiated vmbus version

Export the negotiated vmbus version as this may be useful for
individual drivers.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 drivers/hv/connection.c |    9 +++++++++
 include/linux/hyperv.h  |    6 ++++++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/drivers/hv/connection.c b/drivers/hv/connection.c
index 2b56a3f..70ea5d1 100644
--- a/drivers/hv/connection.c
+++ b/drivers/hv/connection.c
@@ -30,6 +30,7 @@
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/hyperv.h>
+#include <linux/export.h>
 #include <asm/hyperv.h>
 #include "hyperv_vmbus.h"
 
@@ -54,6 +55,12 @@ struct vmbus_connection vmbus_connection = {
 
 #define VERSION_INVAL -1
 
+/*
+ * Negotiated protocol version with the host.
+ */
+__u32 vmbus_proto_version;
+EXPORT_SYMBOL_GPL(vmbus_proto_version);
+
 static __u32 vmbus_get_next_version(__u32 current_version)
 {
 	switch (current_version) {
@@ -215,6 +222,8 @@ int vmbus_connect(void)
 	if (version == VERSION_INVAL)
 		goto cleanup;
 
+	vmbus_proto_version = version;
+	pr_info("Negotiated host information %d\n", version);
 	kfree(msginfo);
 	return 0;
 
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index bee559a..134a202 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1204,5 +1204,11 @@ int hv_kvp_init(struct hv_util_service *);
 void hv_kvp_deinit(void);
 void hv_kvp_onchannelcallback(void *);
 
+/*
+ * Negotiated version with the Host.
+ */
+
+extern __u32 vmbus_proto_version;
+
 #endif /* __KERNEL__ */
 #endif /* _HYPERV_H */
-- 
1.7.4.1

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