Merge tag 'pm+acpi-3.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI and power management fixes from Rafael Wysocki:

 - ACPI tables in some BIOSes list device resources with size equal to
   0, which doesn't make sense, so we should ignore them, but instead we
   try to use them and mangle things completely.  Fix from Zhang Rui.

 - Several models of Samsung laptops accumulate EC events when they are
   in sleep states which leads to EC buffer overflows that prevent new
   events from being signaled after system resume or reboot.  This has
   been affecting many users for quite a while and may be addressed by
   clearing the EC buffer during system resume and system startup on
   those machines.  From Kieran Clancy.

 - If the ACPI sleep control and status registers are not present (which
   happens if the Hardware Reduced ACPI mode bit is set in the ACPI
   tables, but also may result from BIOS bugs), we should not try to use
   ACPI to power off the system and ACPI S5 should not be listed as
   supported.  Fix from Aubrey Li.

 - There's a race condition in cpufreq_get() that leads to a kernel
   crash if that function is called at a wrong time.  Fix from Aaron
   Plattner.

 - cpufreq policy objects have to be initialized entirely before they
   are first accessed by their users which isn't the case currently and
   that potentially leads to various kinds of breakage that is difficult
   to debug.  Fix from Viresh Kumar.

 - Locking is missing in __cpufreq_add_dev() which leads to a race
   condition that may trigger a kernel crash.  Fix from Viresh Kumar.

* tag 'pm+acpi-3.14-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI / EC: Clear stale EC events on Samsung systems
  cpufreq: Initialize governor for a new policy under policy->rwsem
  cpufreq: Initialize policy before making it available for others to use
  cpufreq: use cpufreq_cpu_get() to avoid cpufreq_get() race conditions
  ACPI / sleep: pm_power_off needs more sanity checks to be installed
  ACPI / resources: ignore invalid ACPI device resources

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index b7201fc6f1e1..0bdacc5e26a3 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -77,18 +77,24 @@ bool acpi_dev_resource_memory(struct acpi_resource *ares, struct resource *res)
         switch (ares->type) {
         case ACPI_RESOURCE_TYPE_MEMORY24:
                 memory24 = &ares->data.memory24;
+                if (!memory24->address_length)
+                        return false;
                 acpi_dev_get_memresource(res, memory24->minimum,
                                          memory24->address_length,
                                          memory24->write_protect);
                 break;
         case ACPI_RESOURCE_TYPE_MEMORY32:
                 memory32 = &ares->data.memory32;
+                if (!memory32->address_length)
+                        return false;
                 acpi_dev_get_memresource(res, memory32->minimum,
                                          memory32->address_length,
                                          memory32->write_protect);
                 break;
         case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
                 fixed_memory32 = &ares->data.fixed_memory32;
+                if (!fixed_memory32->address_length)
+                        return false;
                 acpi_dev_get_memresource(res, fixed_memory32->address,
                                          fixed_memory32->address_length,
                                          fixed_memory32->write_protect);
@@ -144,12 +150,16 @@ bool acpi_dev_resource_io(struct acpi_resource *ares, struct resource *res)
         switch (ares->type) {
         case ACPI_RESOURCE_TYPE_IO:
                 io = &ares->data.io;
+                if (!io->address_length)
+                        return false;
                 acpi_dev_get_ioresource(res, io->minimum,
                                         io->address_length,
                                         io->io_decode);
                 break;
         case ACPI_RESOURCE_TYPE_FIXED_IO:
                 fixed_io = &ares->data.fixed_io;
+                if (!fixed_io->address_length)
+                        return false;
                 acpi_dev_get_ioresource(res, fixed_io->address,
                                         fixed_io->address_length,
                                         ACPI_DECODE_10);