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Subject[PATCH 4/6] Drivers: hv: vmbus: Remove the channel from the channel list(s) on failure
Date
Properly rollback state in vmbus_pocess_offer() in the failure paths.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.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 af53168..bf9b80c 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -348,7 +348,7 @@ 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
@@ -360,15 +360,26 @@ 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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