[GIT PULL] ACPI fixes for 4.1-rc4
From: Rafael J. Wysocki
Date: Thu May 14 2015 - 19:22:14 EST
Please pull from
to receive ACPI fixes for v4.1-rc4 with top-most commit 4de5167ee07f
Merge branches 'acpi-init' and 'acpica'
on top of commit 030bbdbf4c833bc69f502eae58498bc5572db736
Two fixes here, one revert of a recent ACPICA commit that broke
audio support on one Dell machine and a fix for a long-standing
issue that may cause systems to break randomly during boot.
- The recent ACPICA commit that set the ACPI _REV return value to 2
(which is the value always used by Windows and now mandated by the
spec too) in order to prevent the firmware people from using it to
play tricks with us caused a serious audio regression to happen on
Dell XPS 13 (the AML on that machine uses the _REV return value to
decide how to expose audio to the OS and does that to hide the
lack of proper support for its I2S audio in Linux), so revert that
commit for now and we'll revisit the issue in the next cycle.
- Ensure that the ordering of acpi_reserve_resources() with respect
to the rest of the ACPI initialization sequence will always be
the same, or the IO or memory region occupied by the ACPI fixed
registers may be assigned to a PCI host bridge as a result of
a race and random breakage ensues going forward.
Rafael J. Wysocki (2):
ACPI / init: Fix the ordering of acpi_reserve_resources()
Revert "ACPICA: Permanently set _REV to the value '2'."
drivers/acpi/acpica/utglobal.c | 13 +++----------
drivers/acpi/osl.c | 6 ++----
2 files changed, 5 insertions(+), 14 deletions(-)
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/