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We should not set res to 0 in function sas_ex_discover_dev in order to let it discover it further when wide port hotplug in . Signed-off-by: Tom Peng <tom_peng@usish.com> Signed-off-by: Jack Wang <jack_wang@usish.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>