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vmbus: don't acquire the mutex in vmbus_hvsock_device_unregister()

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Due to commit 54a66265d6 ("Drivers: hv: vmbus: Fix rescind handling"),
we need this patch to resolve the below deadlock:

after we get the mutex in vmbus_hvsock_device_unregister() and call
vmbus_device_unregister() -> device_unregister() -> ... -> device_release()
-> vmbus_device_release(), we'll get a deadlock, because
vmbus_device_release() tries to get the same mutex.

Signed-off-by: Dexuan Cui <[email protected]>
Cc: K. Y. Srinivasan <[email protected]>
Cc: Haiyang Zhang <[email protected]>
Cc: Stephen Hemminger <[email protected]>
Signed-off-by: K. Y. Srinivasan <[email protected]>
Cc: [email protected] (4.13 and above)
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Dexuan Cui 2017-09-21 23:41:47 -07:00 • committed by Greg Kroah-Hartman
commit 33c150c2ee
1 changed files with 0 additions and 4 deletions
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4
drivers/hv/channel_mgmt.c
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@ -936,14 +936,10 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
void vmbus_hvsock_device_unregister(struct vmbus_channel *channel)
{
mutex_lock(&vmbus_connection.channel_mutex);
BUG_ON(!is_hvsock_channel(channel));
channel->rescind = true;
vmbus_device_unregister(channel->device_obj);
mutex_unlock(&vmbus_connection.channel_mutex);
}
EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister);