On Monday, January 22, 2018 9:51:30 AM CET Hans de Goede wrote: > Hi All, > > Here is v2 of this set, new in v2 is the addressing of Bjorn's comments > to the "PCI: acpiphp_ibm: prepare for acpi_get_object_info no longer > returning status" patch and a new patch (the first patch in v2) which > exports acpi_bus_get_status_handle() for use in modules as acpiphp_ibm > will now depend on it. > > Here is the old coverletter from v1 (adjusted for the new patch): > > The ACPI code already contains quite a bit of code to not bind the > ACPI-battery until all deps for an ACPI battery device have been met, > but on some devices calling _STA before all deps are met is a problem > too because the _STA method uses an i2c OpRegion there. > > Here is the DSDT of the device I'm seeing this on: > https://fedorapeople.org/~jwrdegoede/toshiba-click-mini-dsdt.dsl > > This series modifies the kernel to not call _STA until all deps are met, > mirroring the binding behavior of the battery driver. > > Without this series a total of 32 ACPI errors get printend to the console > on boot, there are 4 errors per _STA call, 2 battery devices on this > system and 4 _STA calls per battery device. > > The first 2 commits are preparation commits for making the ACPICA changes > in the 4th commit, these commits are necessary to not break things after > the ACPICA changes. > > The 3th commit modifies acpi_bus_get_status to not call _STA on > battery devices until all deps are met. This fixes 2 of the 4 too early > _STA calls triggering these errors. > > The 4th commit makes the device instantiation code use > acpi_bus_get_status instead of acpi_bus_get_status_handle so that the > code to get the initial status also does not makes 1 too early _STA call. > > The 5th commit changes the ACPICA acpi_get_object_info function to not > call _STA. Only 1 user (which is fixed in the first commit) cares about > acpi_device_info.current_status. And the ACPICA code has this comment: > > * Note: This interface is intended to be used during the initial device > * discovery namespace traversal. Therefore, no complex methods can be > * executed, especially those that access operation regions. Therefore, do > * not add any additional methods that could cause problems in this area. > * Because of this reason support for the following methods has been removed: > * this was the fate of the _SUB method which was found to cause such > * problems and was removed (11/2015). > > The described problems with the _SUB method clearly also apply to the _STA > method, so removing it from acpi_get_object_info seems like it is the right > thing to do here. This too fixes 1 too early _STA call, so that with all > 5 patches in place we've fixed all 4 too early _STA calls. I've applied [1-4/5] from this series. The last one needs to go in via ACPICA anyway or we'll need to carry a Linux-specific replacement for acpi_get_object_info(). -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
