PCI: acpiphp: Re-enumerate devices when host bridge receives Bus Check
authorYinghai Lu <yinghai@kernel.org>
Tue, 7 May 2013 17:06:03 +0000 (11:06 -0600)
committerBjorn Helgaas <bhelgaas@google.com>
Fri, 17 May 2013 20:12:06 +0000 (14:12 -0600)
commit3f327e39b4b8f760c331bb2836735be6d83fbf53
treec2ebbf36764c554c31d82a82a6afb174c8e2b698
parentf722406faae2d073cc1d01063d1123c35425939e
PCI: acpiphp: Re-enumerate devices when host bridge receives Bus Check

When a PCI host bridge device receives a Bus Check notification, we
must re-enumerate starting with the bridge to discover changes (devices
that have been added or removed).

Prior to 668192b678 ("PCI: acpiphp: Move host bridge hotplug to
pci_root.c"), this happened in _handle_hotplug_event_bridge().  After that
commit, _handle_hotplug_event_bridge() is not installed for host bridges,
and the host bridge notify handler, _handle_hotplug_event_root() did not
re-enumerate.

This patch adds re-enumeration to _handle_hotplug_event_root().

This fixes cases where we don't notice the addition or removal of
PCI devices, e.g., the PCI-to-USB ExpressCard in the bugzilla below.

[bhelgaas: changelog, references]
Reference: https://lkml.kernel.org/r/CAAh6nkmbKR3HTqm5ommevsBwhL_u0N8Rk7Wsms_LfP=nBgKNew@mail.gmail.com
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=57961
Reported-by: Gavin Guo <tuffkidtt@gmail.com>
Tested-by: Gavin Guo <tuffkidtt@gmail.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jiang Liu <jiang.liu@huawei.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
CC: stable@vger.kernel.org # v3.9+
drivers/acpi/pci_root.c
drivers/pci/hotplug/acpiphp_glue.c
include/linux/pci-acpi.h