linux-kernel - [PATCH 1/1] Drivers: hv: vmbus: Fix a bug in channel rescind code

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Date:	Fri, 11 Oct 2013 17:27:16 -0700
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>, <stable@...r.kernel.org>,
	"[3.11+]"@linuxonhyperv.com
Subject: [PATCH 1/1] Drivers: hv: vmbus: Fix a bug in channel rescind code

Rescind of subchannels were not being correctly handled. Fix the bug.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Cc: <stable@...r.kernel.org>        [3.11+]
---
 drivers/hv/channel_mgmt.c |    8 ++------
 1 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index bbff5f2..eebf566 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -203,7 +203,8 @@ static void vmbus_process_rescind_offer(struct work_struct *work)
 	struct vmbus_channel *primary_channel;
 	struct vmbus_channel_relid_released msg;
 
-	vmbus_device_unregister(channel->device_obj);
+	if (channel->device_obj)
+		vmbus_device_unregister(channel->device_obj);
 	memset(&msg, 0, sizeof(struct vmbus_channel_relid_released));
 	msg.child_relid = channel->offermsg.child_relid;
 	msg.header.msgtype = CHANNELMSG_RELID_RELEASED;
@@ -213,11 +214,6 @@ static void vmbus_process_rescind_offer(struct work_struct *work)
 		spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
 		list_del(&channel->listentry);
 		spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
-	} else {
-		primary_channel = channel->primary_channel;
-		spin_lock_irqsave(&primary_channel->sc_lock, flags);
-		list_del(&channel->listentry);
-		spin_unlock_irqrestore(&primary_channel->sc_lock, flags);
 	}
 	free_channel(channel);
 }
-- 
1.7.4.1

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