The patch titled
pci pm: follow PCI_PM_CTRL_NO_SOFT_RESET during transitions from D3
has been removed from the -mm tree. Its filename was
pci-pm-follow-pci_pm_ctrl_no_soft_reset-during-transitions-from-d3.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: pci pm: follow PCI_PM_CTRL_NO_SOFT_RESET during transitions from D3
From: Rafael J. Wysocki <rjw@xxxxxxx>
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.
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/pci/pci.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN drivers/pci/pci.c~pci-pm-follow-pci_pm_ctrl_no_soft_reset-during-transitions-from-d3 drivers/pci/pci.c
--- a/drivers/pci/pci.c~pci-pm-follow-pci_pm_ctrl_no_soft_reset-during-transitions-from-d3
+++ a/drivers/pci/pci.c
@@ -485,6 +485,8 @@ static int pci_raw_set_power_state(struc
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))
_
Patches currently in -mm which might be from rjw@xxxxxxx are
origin.patch
linux-next.patch
drivers-rtc-rtc-cmosc-cmos_init-dont-ignore-pnp_register_driver-return-value.patch
mm-pm-freezer-disable-oom-killer-when-tasks-are-frozen.patch
shrink_slab-handle-bad-shrinkers.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
