PCI/MSI: Export MSI mode using attributes, not kobjects

The PCI MSI sysfs code is a mess with kobjects for things that don't really
need to be kobjects.  This patch creates attributes dynamically for the MSI
interrupts instead of using kobjects.

Note, this removes a directory from sysfs.  Old MSI kobjects:

  pci_device
     └── msi_irqs
         └── 40
             └── mode

New MSI attributes:

  pci_device
     └── msi_irqs
         └── 40

As there was only one file "mode" with the kobject model, the interrupt
number is now a file that returns the "mode" of the interrupt (msi vs.
msix).

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>

1 files changed, 4 insertions, 7 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
index 5210a51c90fd..a3c5a6685036 100644
--- a/Documentation/ABI/testing/sysfs-bus-pci
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -70,18 +70,15 @@ Date:		September, 2011
 Contact:        Neil Horman <nhorman@tuxdriver.com>
 Description:
                 The /sys/devices/.../msi_irqs directory contains a variable set
-                of sub-directories, with each sub-directory being named after a
-                corresponding msi irq vector allocated to that device.  Each
-                numbered sub-directory N contains attributes of that irq.
-                Note that this directory is not created for device drivers which
-                do not support msi irqs
+                of files, with each file being named after a corresponding msi
+                irq vector allocated to that device.
 
-What:           /sys/bus/pci/devices/.../msi_irqs/<N>/mode
+What:           /sys/bus/pci/devices/.../msi_irqs/<N>
 Date:           September 2011
 Contact:        Neil Horman <nhorman@tuxdriver.com>
 Description:
                 This attribute indicates the mode that the irq vector named by
-                the parent directory is in (msi vs. msix)
+                the file is in (msi vs. msix)
 
 What:           /sys/bus/pci/devices/.../remove
 Date:           January 2009