tree 274171a30a202a708a6aacbf9e0a693a2b5474ad
parent 1b69dfc649e6658fc38499cf704750d74cabc73d
author Alex Chiang <achiang@hp.com> 1237582570 -0600
committer Jesse Barnes <jbarnes@virtuousgeek.org> 1237586241 -0700

PCI: always scan child buses

While scanning bridges, we stop our scan if we encounter a bus
that we've seen before, to work around some buggy chipsets. This
is a good idea, but prevents us from fully scanning the PCI bus
at a future time (to find newly hot-added devices, for example).

Change the logic so that we skip _re-adding_ an existing bus
that we've seen before, but also allow the scan to descend to
all child buses.

Now that we're potentially scanning our child buses again, we
also need to be sure not to attempt re-initializing their BARs
so we avoid that.

This patch lays the groundwork to allow the user to issue a
rescan of the PCI bus at any time.

Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>