Allow Link state changes for Hot-Plug

Hello,

I had sent out this patchset as an "RFC" a few weeks back. It was briefly discussed last week ( http://marc.info/?t=138513966800006&r=1&w=2 ). I was wondering if you got a chance to look at this, and would appreciate it a lot if this could be reviewed for inclusion in the tree.

In v2, I have dropped the use of module parameter as suggested by Bjorn.

This patch set enables the use of PCI Express link up and link down events for Hotplug or Unplug. The requirement of such a feature was originally discussed here:

http://www.spinics.net/lists/linux-pci/msg05783.html
http://www.spinics.net/lists/hotplug/msg05801.html

Patch [1/4]: makes a function non-static for use by patch 2. Patch [2/4]: Contains the bulk logic to allow link events to be used
for hotplug and removal.
Patch [3/4]: Makes the pciehp_power_thread() lock free by making it

             look at a work info->req instead of slot->state.

Patch [4/4]: Introduce slot->hotplug_lock to serialize the hotplug
operations.

(As a side effect, this patch also fixes the bug
https://bugzilla.kernel.org/show_bug.cgi?id=65521 )

I'd appreciate if you could please review and provide me with any comments.

Thanks,

Rajat

Rajat Jain (4):
pciehp: Make check_link_active() non-static
pciehp: Use link change notifications for hot-plug and removal
pciehp: Ensure very fast hotplug events are also processed.
pciehp: Introduce hotplug_lock to serialize HP events

 drivers/pci/hotplug/pciehp.h      |    5 ++
 drivers/pci/hotplug/pciehp_core.c |    7 +-
 drivers/pci/hotplug/pciehp_ctrl.c |  179 ++++++++++++++++++++++++++++++++-----
 drivers/pci/hotplug/pciehp_hpc.c  |   63 +++++++------
 4 files changed, 200 insertions(+), 54 deletions(-)

1.7.9.5