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Drivers: hv: vmbus: Remove the channel from the channel list(s) on failure

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

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2015-02-28 11:18:19 -08:00 committed by Greg Kroah-Hartman
parent 2dd37cb815
commit 5b1e5b5307
1 changed files with 16 additions and 5 deletions
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21
drivers/hv/channel_mgmt.c
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@ -386,7 +386,7 @@ 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
@ -398,15 +398,26 @@ 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);
}