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NAS-128368 / None / nvme: acquire a new subsystem if no valid controllers assigned #178

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May 23, 2024
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NAS-128368 / None / nvme: acquire a new subsystem if no valid controllers assigned #178

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13 changes: 13 additions & 0 deletions drivers/nvme/host/core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2719,8 +2719,21 @@ static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn)
return NULL;

list_for_each_entry(subsys, &nvme_subsystems, entry) {
bool valid_ctrl = false;
struct nvme_ctrl *ctrl;

if (strcmp(subsys->subnqn, subsysnqn))
continue;
if (list_empty(&subsys->ctrls))
continue;
list_for_each_entry(ctrl, &subsys->ctrls, subsys_entry) {
if (!nvme_state_terminal(ctrl)) {
valid_ctrl = true;
break;
}
}
if (!valid_ctrl)
continue;
if (!kref_get_unless_zero(&subsys->ref))
continue;
return subsys;
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