On Mon, Aug 20, 2018 at 10:31 AM Rafael J. Wysocki [off-list ref] wrote:

On Fri, Aug 17, 2018 at 12:32 PM Arnd Bergmann [off-list ref] wrote:

quoted

-static struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
-               struct pci_ops *ops, void *sysdata, struct list_head *resources)
+void pcibios_scan_root(int busnum)
 {
+       struct pci_sysdata *sd;
        struct pci_host_bridge *bridge;
        int error;

-       bridge = pci_alloc_host_bridge(0);
-       if (!bridge)
-               return NULL;
+       bridge = pci_alloc_host_bridge(sizeof(sd));
+       if (!bridge) {
+               printk(KERN_ERR "PCI: OOM, skipping PCI bus %02x\n", busnum);
+               return;
+       }
+       sd = pci_host_bridge_priv(bridge);

This looks fishy, as bridge->private is not set at this point AFAICS,
unless one of the previous patches changes that.

bridge->private what comes after the bridge structure, and it's allocated
by pci_alloc_host_bridge() passing the size of the structure we want
for this private area.

         Arnd