PCI: hotplug: pciehp: Fix possible race condition in writing slot
authorKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Thu, 31 May 2007 16:43:34 +0000 (09:43 -0700)
committerGreg Kroah-Hartman <gregkh@suse.de>
Wed, 11 Jul 2007 23:02:08 +0000 (16:02 -0700)
commitf477836457730a2b925f625023ec4e5bf11015be
tree178c8e7efd7a3f8f0220d3da537d649f4cb1278f
parentadf809d01043d8808e47db2d35fc07b53062884e
PCI: hotplug: pciehp: Fix possible race condition in writing slot

The slot control register is modified as follows:

    (1) Read the register value
    (2) Change the value
    (3) Write the value to the register

Those must be done atomically, otherwise writing to control register
would cause an unexpected result.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/pci/hotplug/pciehp.h
drivers/pci/hotplug/pciehp_hpc.c