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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2009-05-18 22:51:12 +0200 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2009-06-11 12:04:20 -0700 |
| commit | f62795f1e892ca9269849fa83de97621da7e02c0 (patch) | |
| tree | cfa28abc0ec45270045e7fd0e852efd1e3e319a3 /drivers/pci/pci.c | |
| parent | 4d135dbee7b0a89e946f7ba284f2b957505a2c3a (diff) | |
| download | linux-3.10-f62795f1e892ca9269849fa83de97621da7e02c0.tar.gz linux-3.10-f62795f1e892ca9269849fa83de97621da7e02c0.tar.bz2 linux-3.10-f62795f1e892ca9269849fa83de97621da7e02c0.zip | |
PCI PM: Follow PCI_PM_CTRL_NO_SOFT_RESET during transitions from D3
According to the PCI PM specification (PCI Bus Power Management
Interface Specification, Rev. 1.2, Section 5.4.1) we are supposed to
reinitialize devices that have PCI_PM_CTRL_NO_SOFT_RESET clear during
all transitions from PCI_D3hot to PCI_D0, but we only do it if the
device's current_state field is equal to PCI_UNKNOWN.
This may lead to problems if a device with PCI_PM_CTRL_NO_SOFT_RESET
unset is put into PCI_D3hot at run time by its driver and
pci_set_power_state() is used to put it back into PCI_D0, because in
that case the device will remain uninitialized after
pci_set_power_state() has returned. Prevent that from happening by
modifying pci_raw_set_power_state() to reinitialize devices with
PCI_PM_CTRL_NO_SOFT_RESET unset during all transitions from D3 to D0.
Cc: stable@kernel.org
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 1a91bf9687a..761557688b1 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -480,6 +480,8 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state) pmcsr &= ~PCI_PM_CTRL_STATE_MASK; pmcsr |= state; break; + case PCI_D3hot: + case PCI_D3cold: case PCI_UNKNOWN: /* Boot-up */ if ((pmcsr & PCI_PM_CTRL_STATE_MASK) == PCI_D3hot && !(pmcsr & PCI_PM_CTRL_NO_SOFT_RESET)) |