device: bus_type: Introduce num_vf callback

This allows for bus types to implement their own method of retrieving
the number of virtual functions a NIC on that type of bus supports.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/device.h b/include/linux/device.h
index 491b4c0ca6333a217e90cc8841f8b2c5f5bc1dc4..6d73b70a4a5d765a819e580f5cd7b83e0c661c61 100644 (file)
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -88,6 +88,8 @@ extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  *
  * @suspend:   Called when a device on this bus wants to go to sleep mode.
  * @resume:    Called to bring a device on this bus out of sleep mode.
+ * @num_vf:    Called to find out how many virtual functions a device on this
+ *             bus supports.
  * @pm:                Power management operations of this bus, callback the specific
  *             device driver's pm-ops.
  * @iommu_ops:  IOMMU specific operations for this bus, used to attach IOMMU
@@ -127,6 +129,8 @@ struct bus_type {
        int (*suspend)(struct device *dev, pm_message_t state);
        int (*resume)(struct device *dev);
 
+       int (*num_vf)(struct device *dev);
+
        const struct dev_pm_ops *pm;
 
        const struct iommu_ops *iommu_ops;