PCI: read current power state at enable time
authorJesse Barnes <jbarnes@virtuousgeek.org>
Fri, 5 Nov 2010 19:16:36 +0000 (15:16 -0400)
committerJesse Barnes <jbarnes@virtuousgeek.org>
Thu, 11 Nov 2010 17:38:14 +0000 (09:38 -0800)
commit97c145f7c87453cec90e91238fba5fe2c1561b32
treee69b486547e713b6a9358ad780dcdf7b697a7912
parent3b519e4ea618b6943a82931630872907f9ac2c2b
PCI: read current power state at enable time

When we enable a PCI device, we avoid doing a lot of the initial setup
work if the device's enable count is non-zero.  If we don't fetch the
power state though, we may later fail to set up MSI due to the unknown
status.  So pick it up before we short circuit the rest due to a
pre-existing enable or mismatched enable/disable pair (as happens with
VGA devices, which are special in a special way).

Tested-by: Jesse Brandeburg <jesse.brandeburg@gmail.com>
Reported-by: Dave Airlie <airlied@linux.ie>
Tested-by: Dave Airlie <airlied@linux.ie>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
drivers/pci/pci.c