linux-kernel - [PATCH V2 4/6] Drivers: hv: vmbus: Remove the channel from the channel list(s) on failure

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Message-Id: <1425151101-3679-4-git-send-email-kys@microsoft.com>
Date:	Sat, 28 Feb 2015 11:18:19 -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,
	vkuznets@...hat.com
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: [PATCH V2 4/6] Drivers: hv: vmbus: Remove the channel from the channel list(s) on failure

Properly rollback state in vmbus_pocess_offer() in the failure paths.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
---
 drivers/hv/channel_mgmt.c |   21 ++++++++++++++++-----
 1 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index 6c1f792..cc6996a 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -384,7 +384,7 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel)
 		&newchannel->offermsg.offer.if_instance,
 		newchannel);
 	if (!newchannel->device_obj)
-		goto err_free_chan;
+		goto err_deq_chan;
 
 	/*
 	 * Add the new device to the bus. This will kick off device-driver
@@ -396,15 +396,26 @@ static void vmbus_process_offer(struct vmbus_channel *newchannel)
 		pr_err("unable to add child device object (relid %d)\n",
 			   newchannel->offermsg.child_relid);
 
-		spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
-		list_del(&newchannel->listentry);
-		spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
 		kfree(newchannel->device_obj);
-		goto err_free_chan;
+		goto err_deq_chan;
 	}
 
 	return;
 
+err_deq_chan:
+	spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
+	list_del(&newchannel->listentry);
+	spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
+
+	if (newchannel->target_cpu != get_cpu()) {
+		put_cpu();
+		smp_call_function_single(newchannel->target_cpu,
+					 percpu_channel_deq, newchannel, true);
+	} else {
+		percpu_channel_deq(newchannel);
+		put_cpu();
+	}
+
 err_free_chan:
 	free_channel(newchannel);
 }
-- 
1.7.4.1

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