[PATCH v2 00/12] ACPI/IPMI: Fix several issues in the current codes

[Lv Zheng <lv.zheng@intel.com>]

This patchset tries to fix the following kernel bug:
Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=46741
This is fixed by [PATCH 06].

The bug shows IPMI operation region may appear in a device not under the
IPMI system interface device's scope, thus it's required to install the
ACPI IPMI operation region handler from the root of the ACPI namespace.

The original acpi_ipmi implementation includes several issues that break
the test process.  This patchset also includes a re-design of acpi_ipmi
module to make the test possible.
 
[PATCH 01-06] are bug-fix patches that can be applied to the kernels whose
              version is > 2.6.38.  This can be confirmed with:
              # git tag --contains e92b297c
[PATCH 07] is a tuning patch for acpi_ipmi.c.
[PATCH 08-12] are cleanup patches for acpi_ipmi.c and its Kconfig item.

v2.0
PATCH 03: Uses timeout mechanism offerred by ipmi_si.
PATCH 05: Uses kref instead of atomic_t and adds "dead" flag to kill the
          atomic_read codes in ipmi_flush_tx_msg().
PATCH 07: Uses kref instead of atomic_t.

This patchset has passed the test around a fake device accessing IPMI
operation region fields on an IPMI capable platform.  A stress test of
module(acpi_ipmi) load/unload has been performed on such platform.  No
races can be found and the IPMI operation region handler is functioning
now.  It is not possible to test module(ipmi_si) load/unload as it can't be
unloaded due to its' transfer flushing implementation.

Lv Zheng (12):
  ACPI/IPMI: Fix atomic context requirement of ipmi_msg_handler()
  ACPI/IPMI: Fix potential response buffer overflow
  ACPI/IPMI: Fix race caused by the unprotected ACPI IPMI transfers
  ACPI/IPMI: Fix race caused by the timed out ACPI IPMI transfers
  ACPI/IPMI: Fix race caused by the unprotected ACPI IPMI user
  ACPI/IPMI: Fix issue caused by the per-device registration of the
    IPMI operation region handler
  ACPI/IPMI: Add reference counting for ACPI IPMI transfers
  ACPI/IPMI: Cleanup several acpi_ipmi_device members
  ACPI/IPMI: Cleanup some initialization codes
  ACPI/IPMI: Cleanup some inclusion codes
  ACPI/IPMI: Cleanup some Kconfig codes
  ACPI/IPMI: Cleanup coding styles

 drivers/acpi/Kconfig     |    3 +-
 drivers/acpi/acpi_ipmi.c |  594 ++++++++++++++++++++++++++++------------------
 2 files changed, 367 insertions(+), 230 deletions(-)

-- 
1.7.10