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| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-11-19 11:49:35 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-11-19 11:49:35 +0000 |
| commit | 9e18e1869f5ebac69f0d881fe97a198ebc0834db (patch) | |
| tree | 18c5b5c185d39cbb50fa652b5e08d047c8cf06e1 /drivers/pci/pci.c | |
| parent | 04af964f9cb666caa7c1436d003f8fac0f1fedcc (diff) | |
| parent | 460ed699f4c943e1ec4a8458869eb532fe31fd16 (diff) | |
| download | talos-op-linux-9e18e1869f5ebac69f0d881fe97a198ebc0834db.tar.gz talos-op-linux-9e18e1869f5ebac69f0d881fe97a198ebc0834db.zip | |
Merge branch 'next-samsung-asoc' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung into for-2.6.38
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index e98c8104297b..710c8a29be0d 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1007,6 +1007,18 @@ static int __pci_enable_device_flags(struct pci_dev *dev, int err; int i, bars = 0; + /* + * Power state could be unknown at this point, either due to a fresh + * boot or a device removal call. So get the current power state + * so that things like MSI message writing will behave as expected + * (e.g. if the device really is in D0 at enable time). + */ + if (dev->pm_cap) { + u16 pmcsr; + pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr); + dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK); + } + if (atomic_add_return(1, &dev->enable_cnt) > 1) return 0; /* already enabled */ |
