This Linux kernel change "Revert “ACPICA: Clear status of GPEs before enabling them”" is included in the Linux 5.1 release. This change is authored by Rafael J. Wysocki <rafael.j.wysocki [at] intel.com> on Tue Apr 30 11:18:21 2019 +0200. The commit for this change in Linux stable tree is 2c2a2fb (patch).
Revert "ACPICA: Clear status of GPEs before enabling them" Revert commit c8b1917c8987 ("ACPICA: Clear status of GPEs before enabling them") that causes problems with Thunderbolt controllers to occur if a dock device is connected at init time (the xhci_hcd and thunderbolt modules crash which prevents peripherals connected through them from working). Commit c8b1917c8987 effectively causes commit ecc1165b8b74 ("ACPICA: Dispatch active GPEs at init time") to get undone, so the problem addressed by commit ecc1165b8b74 appears again as a result of it. Fixes: c8b1917c8987 ("ACPICA: Clear status of GPEs before enabling them") Link: https://firstname.lastname@example.org/T/#u Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1132943 Reported-by: Michael Hirmke <email@example.com> Reported-by: Takashi Iwai <firstname.lastname@example.org> Cc: 4.17+ <email@example.com> # 4.17+ Signed-off-by: Rafael J. Wysocki <firstname.lastname@example.org>
There are 6 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.
drivers/acpi/acpica/evgpe.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/drivers/acpi/acpica/evgpe.c b/drivers/acpi/acpica/evgpe.c index 5e9d734..62d3aa7 100644 --- a/drivers/acpi/acpica/evgpe.c +++ b/drivers/acpi/acpica/evgpe.c @@ -81,12 +81,8 @@ acpi_status acpi_ev_enable_gpe(struct acpi_gpe_event_info *gpe_event_info) ACPI_FUNCTION_TRACE(ev_enable_gpe); - /* Clear the GPE status */ - status = acpi_hw_clear_gpe(gpe_event_info); - if (ACPI_FAILURE(status)) - return_ACPI_STATUS(status); - /* Enable the requested GPE */ + status = acpi_hw_low_set_gpe(gpe_event_info, ACPI_GPE_ENABLE); return_ACPI_STATUS(status); }