PCI: Add pci_bus_set_ops

pci_bus_set_ops changes pci_ops associated with a pci_bus. This can be
used by debug tools such as PCIE AER error injection to fake some PCI
configuration registers.

Acked-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 0f3706512686..db23200c4874 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -66,6 +66,25 @@ EXPORT_SYMBOL(pci_bus_write_config_byte);
 EXPORT_SYMBOL(pci_bus_write_config_word);
 EXPORT_SYMBOL(pci_bus_write_config_dword);
 
+/**
+ * pci_bus_set_ops - Set raw operations of pci bus
+ * @bus:        pci bus struct
+ * @ops:        new raw operations
+ *
+ * Return previous raw operations
+ */
+struct pci_ops *pci_bus_set_ops(struct pci_bus *bus, struct pci_ops *ops)
+{
+        struct pci_ops *old_ops;
+        unsigned long flags;
+
+        spin_lock_irqsave(&pci_lock, flags);
+        old_ops = bus->ops;
+        bus->ops = ops;
+        spin_unlock_irqrestore(&pci_lock, flags);
+        return old_ops;
+}
+EXPORT_SYMBOL(pci_bus_set_ops);
 
 /**
  * pci_read_vpd - Read one entry from Vital Product Data