linux-kernel - [PATCH 3/6] Drivers: hv: vmbus: decrease num

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Date:	Tue, 21 Apr 2015 16:27:37 +0200
From:	Vitaly Kuznetsov <vkuznets@...hat.com>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	Haiyang Zhang <haiyangz@...rosoft.com>,
	devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
	Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH 3/6] Drivers: hv: vmbus: decrease num_sc on subchannel removal

It is unlikely that that host will ask us to close only one subchannel for a
device but let's be consistent. Do both num_sc++ and num_sc-- with
channel->lock to be on the safe side.

Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
---
 drivers/hv/channel_mgmt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index b28cbdf..8b4b561 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -205,6 +205,7 @@ void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid)
 		primary_channel = channel->primary_channel;
 		spin_lock_irqsave(&primary_channel->lock, flags);
 		list_del(&channel->sc_list);
+		channel->num_sc--;
 		spin_unlock_irqrestore(&primary_channel->lock, flags);
 	}
 	free_channel(channel);
@@ -265,8 +266,8 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel)
 			newchannel->primary_channel = channel;
 			spin_lock_irqsave(&channel->lock, flags);
 			list_add_tail(&newchannel->sc_list, &channel->sc_list);
-			spin_unlock_irqrestore(&channel->lock, flags);
 			channel->num_sc++;
+			spin_unlock_irqrestore(&channel->lock, flags);
 		} else
 			goto err_free_chan;
 	}
-- 
1.9.3

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