On 05/15/2013 07:30 AM, Benjamin Herrenschmidt wrote:
On Wed, 2013-05-15 at 00:51 +0800, Jiang Liu wrote:
Enhance PPC architecture specific code to use hotplug-safe iterators
to walk PCI buses.
I was about to ack it but then I saw:
diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
index 51a133a..a41c6dd 100644
--- a/arch/powerpc/kernel/pci_64.c
+++ b/arch/powerpc/kernel/pci_64.c
@@ -208,7 +208,6 @@ long sys_pciconfig_iobase(long which, unsigned long in_bus,
unsigned long in_devfn)
{
struct pci_controller* hose;
- struct list_head *ln;
struct pci_bus *bus = NULL;
struct device_node *hose_node;
@@ -229,18 +228,16 @@ long sys_pciconfig_iobase(long which, unsigned long in_bus,
/* That syscall isn't quite compatible with PCI domains, but it's
* used on pre-domains setup. We return the first match
*/
-
- for (ln = pci_root_buses.next; ln != &pci_root_buses; ln = ln->next) {
- bus = pci_bus_b(ln);
- if (in_bus >= bus->number && in_bus <= bus->busn_res.end)
+ for_each_pci_root_bus(bus)
+ if (in_bus >= bus->number && in_bus <= bus->busn_res.end &&
+ bus->dev.of_node)
break;
- bus = NULL;
- }
- if (bus == NULL || bus->dev.of_node == NULL)
+ if (bus == NULL)
return -ENODEV;
You just removed the NULL check for the of_node field...
Hi Benjamin,
Thanks for review.
I just moved the "bus->dev.of_node == NULL" into the above
for_each_pci_root_bus()
loop:)
Will send you another version according to your suggestion to use
pci_bus_to_host()
to simplify the code.
Regards!
Gerry
hose_node = bus->dev.of_node;
hose = PCI_DN(hose_node)->phb;
Which is dereferrenced here.
+ pci_bus_put(bus);
On the other hand, the whole thing can probably be using
pci_bus_to_host() instead.... the above code is bitrotted.
switch (which) {
case IOBASE_BRIDGE_NUMBER:
Cheeers,
Ben.
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