linux-kernel - [PATCH 1/1] drivers/hv: cleanup synic msrs if vmbus connect failed

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Message-Id: <1444199287-5676-1-git-send-email-den@openvz.org>
Date:	Wed,  7 Oct 2015 09:28:07 +0300
From:	"Denis V. Lunev" <den@...nvz.org>
To:	unlisted-recipients:; (no To-header on input)
Cc:	devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
	Andrey Smetanin <asmetanin@...tuozzo.com>,
	"Denis V. Lunev" <den@...nvz.org>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: [PATCH 1/1] drivers/hv: cleanup synic msrs if vmbus connect failed

From: Andrey Smetanin <asmetanin@...tuozzo.com>

Before vmbus_connect() synic is setup per vcpu - this means
hypervisor receives writes at synic msr's and probably allocate
hypervisor resources per synic setup.

If vmbus_connect() failed for some reason it's neccessary to cleanup
synic setup by call hv_synic_cleanup() at each vcpu to get a chance
to free allocated resources by hypervisor per synic.

This patch does appropriate cleanup in case of vmbus_connect() failure.

Signed-off-by: Andrey Smetanin <asmetanin@...tuozzo.com>
Signed-off-by: Denis V. Lunev <den@...nvz.org>
CC: "K. Y. Srinivasan" <kys@...rosoft.com>
CC: Haiyang Zhang <haiyangz@...rosoft.com>
CC: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 drivers/hv/vmbus_drv.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index f19b6f7..3297731 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -867,7 +867,7 @@ static int vmbus_bus_init(int irq)
 	on_each_cpu(hv_synic_init, NULL, 1);
 	ret = vmbus_connect();
 	if (ret)
-		goto err_alloc;
+		goto err_connect;
 
 	if (vmbus_proto_version > VERSION_WIN7)
 		cpu_hotplug_disable();
@@ -885,6 +885,8 @@ static int vmbus_bus_init(int irq)
 
 	return 0;
 
+err_connect:
+	on_each_cpu(hv_synic_cleanup, NULL, 1);
 err_alloc:
 	hv_synic_free();
 	hv_remove_vmbus_irq();
-- 
2.1.4

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