ib_clients can indeed fill .add to NULL, but then they will not see any device removal notifications. The reason is that that ib_register_client and ib_register_device checked existence of .add before adding the creating a corresponding client_data and adding it to the list. Simple condition reverse fixes the issue. Reviewed-by: Johannes Thumshirn <jthumshirn@xxxxxxx> Reviewed-by: Christoph Hellwig <hch@xxxxxx> Signed-off-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
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