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| author | Shaohua Li <shaohua.li@intel.com> | 2006-10-20 21:45:32 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-10-27 18:20:33 (GMT) |
| commit | 2449e06a5696b7af1c8a369b04c97f3b139cf3bb (patch) | |
| tree | 22ee432f869df8c703fb25035e06d4e92d56be7f /drivers/pci | |
| parent | 3095fc0c9772b4afb3c81f76664f341ef716d380 (diff) | |
| download | linux-2449e06a5696b7af1c8a369b04c97f3b139cf3bb.tar.xz | |
PCI: reset pci device state to unknown state for resume
Considering below scenario:
1.Unload a PCI device's driver, the device ->current remains in PCI_D0.
2.Do suspend/resume circle. After that, BIOS puts the device to D3.
3.Reload the device driver. The calling pci_set_power_state in the
driver can't change the state to D0, as set_power_state thinks the
device is already in D0.
A bug is reported at http://bugzilla.kernel.org/show_bug.cgi?id=6024
Pat attached a patch at
http://marc.theaimsgroup.com/?l=linux-pci&m=114049761428561&w=2 for this
issue, but it's lost. As pci_set_power_state can handle D3 -> D0
correctly (restore config space), I simplified Patrick's patch.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Cc: Patrick Mochel <mochel@digitalimplant.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci-driver.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index b1c0c70..194f1d2 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -265,6 +265,13 @@ static int pci_device_remove(struct device * dev) } /* + * If the device is still on, set the power state as "unknown", + * since it might change by the next time we load the driver. + */ + if (pci_dev->current_state == PCI_D0) + pci_dev->current_state = PCI_UNKNOWN; + + /* * We would love to complain here if pci_dev->is_enabled is set, that * the driver should have called pci_disable_device(), but the * unfortunate fact is there are too many odd BIOS and bridge setups @@ -288,6 +295,12 @@ static int pci_device_suspend(struct device * dev, pm_message_t state) suspend_report_result(drv->suspend, i); } else { pci_save_state(pci_dev); + /* + * mark its power state as "unknown", since we don't know if + * e.g. the BIOS will change its device state when we suspend. + */ + if (pci_dev->current_state == PCI_D0) + pci_dev->current_state = PCI_UNKNOWN; } return i; } |