FROMLIST: PCI: Use local_pci_probe() when best selected cpu is offline

When the best selected CPU is offline, work_on_cpu() will stuck forever.
This can be happen if a node is online while all its CPUs are offline
(we can use "maxcpus=1" without "nr_cpus=1" to reproduce it), Therefore,
in this case, we should call local_pci_probe() instead of work_on_cpu().

Cc: [email protected]
Signed-off-by: Huacai Chen <[email protected]>
Signed-off-by: Hongchen Zhang <[email protected]>

Link: https://lore.kernel.org/all/[email protected]/
Signed-off-by: Kexy Biscuit <[email protected]>

Author: Hongchen Zhang

drivers/pci/pci-driver.c

@@ -386,7 +386,7 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
 		free_cpumask_var(wq_domain_mask);
 	}
 
-	if (cpu < nr_cpu_ids)
+	if ((cpu < nr_cpu_ids) && cpu_online(cpu))
 		error = work_on_cpu(cpu, local_pci_probe, &ddi);
 	else
 		error = local_pci_probe(&ddi);