PCI hotplug: create symlink to hotplug driver module

Create symbolic link to hotplug driver module in the PCI slot
directory (/sys/bus/pci/slots/<SLOT#>). In the past, we need to load
hotplug drivers one by one to identify the hotplug driver that handles
the slot, and it was very inconvenient especially for trouble shooting.
With this change, we can easily identify the hotplug driver.

Signed-off-by: Taku Izumi <izumi.taku@jp.fujitsu.com>
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Reviewed-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index 97ad190e13af..6bf68053e4b8 100644
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -122,3 +122,10 @@ Description:
                 This symbolic link appears when a device is a Virtual Function.
                 The symbolic link points to the PCI device sysfs entry of the
                 Physical Function this device associates with.
+
+What:           /sys/bus/pci/slots/.../module
+Date:           June 2009
+Contact:        linux-pci@vger.kernel.org
+Description:
+                This symbolic link points to the PCI hotplug controller driver
+                module that manages the hotplug slot.