diff options
| author | Bob Moore <robert.moore@intel.com> | 2009-03-09 16:31:04 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-03-27 12:11:02 -0400 |
| commit | 8a335a2331c72e60c6b3ef09b2dedd3ba00da1b1 (patch) | |
| tree | f538a4f68499dab0d59e253bc55a5cf4aff66ec1 /drivers/acpi/acpica/aclocal.h | |
| parent | aab61b676a024d3527f6201e2b31285a96f7a1d2 (diff) | |
ACPICA: Fix AcpiWalkNamespace race condition with table unload
Added a reader/writer locking mechanism to allow multiple
concurrent namespace walks (readers), but a dynamic table unload
will have exclusive access to the namespace. This fixes a problem
where a table unload could delete the portion of the namespace that
is currently being examined by a walk. Adds a new file, utlock.c
that implements the reader/writer lock mechanism. ACPICA BZ 749.
http://www.acpica.org/bugzilla/show_bug.cgi?id=749
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi/acpica/aclocal.h')
| -rw-r--r-- | drivers/acpi/acpica/aclocal.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/aclocal.h b/drivers/acpi/acpica/aclocal.h index 6feebc8f789..18a8d96eaa4 100644 --- a/drivers/acpi/acpica/aclocal.h +++ b/drivers/acpi/acpica/aclocal.h @@ -108,6 +108,14 @@ static char *acpi_gbl_mutex_names[ACPI_NUM_MUTEX] = { #endif #endif +/* Lock structure for reader/writer interfaces */ + +struct acpi_rw_lock { + acpi_mutex writer_mutex; + acpi_mutex reader_mutex; + u32 num_readers; +}; + /* * Predefined handles for spinlocks used within the subsystem. * These spinlocks are created by acpi_ut_mutex_initialize |