On Mon, 5 Oct 2009 00:48:40 +0200 "Rafael J. Wysocki" <rjw@xxxxxxx> wrote: > From: Rafael J. Wysocki <rjw@xxxxxxx> > > After attempting to change the power state of a PCI device > pci_raw_set_power_state() doesn't check if the value it wrote into > the device's PCI_PM_CTRL register has been stored in there, but > unconditionally modifies the device's current_state field to reflect > the change. This may cause problems to happen if the power state of > the device hasn't been changed in fact, because it will make the PCI > PM core make a wrong assumption. > > To prevent such situations from happening modify > pci_raw_set_power_state() so that it reads the device's PCI_PM_CTRL > register after writing into it and uses the value read from the > register to update the device's current_state field. Also make it > print a message saying that the device refused to change its power > state as requested (returning an error code in such cases would cause > suspend regressions to appear on some systems, where device drivers' > suspend routines return error codes if pci_set_power_state() fails). > > Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx> Applied to my for-linus branch, thanks. -- Jesse Barnes, Intel Open Source Technology Center _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
