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vmbus: hvsock: add proper sync for vmbus_hvsock_device_unregister()
Without the patch, vmbus_hvsock_device_unregister() can destroy the device prematurely when close() is called, and can cause NULl dereferencing or potential data loss (the last portion of the data stream may be dropped prematurely). Signed-off-by: Dexuan Cui <decui@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -937,7 +937,10 @@ void vmbus_hvsock_device_unregister(struct vmbus_channel *channel)
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{
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BUG_ON(!is_hvsock_channel(channel));
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channel->rescind = true;
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/* We always get a rescind msg when a connection is closed. */
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while (!READ_ONCE(channel->probe_done) || !READ_ONCE(channel->rescind))
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msleep(1);
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vmbus_device_unregister(channel->device_obj);
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}
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EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister);
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