diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2010-11-22 08:47:43 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2010-11-22 08:47:43 +0000 |
| commit | 4ab0fbd3a29067e1540f05093ae4ed07645d18c8 (patch) | |
| tree | 7f027e92e4578e293b20ac1f2c389600a795ea7f /drivers/pci/pci.c | |
| parent | f3c91c1deaf8493526d8216be94c33e963f00962 (diff) | |
| parent | 3561d43fd289f590fdae672e5eb831b8d5cf0bf6 (diff) | |
Merge remote branch 'linus' into drm-intel-fixes
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 e98c8104297..710c8a29be0 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 */ |