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| author | Bob Moore <robert.moore@intel.com> | 2009-03-09 09:31:04 +0100 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-03-27 17:11:02 +0100 |
| commit | 8a335a2331c72e60c6b3ef09b2dedd3ba00da1b1 (patch) | |
| tree | f538a4f68499dab0d59e253bc55a5cf4aff66ec1 /drivers/acpi/acpica/acutils.h | |
| parent | ACPICA: FADT: Fix extraneous length mismatch warning (diff) | |
| download | linux-8a335a2331c72e60c6b3ef09b2dedd3ba00da1b1.tar.xz linux-8a335a2331c72e60c6b3ef09b2dedd3ba00da1b1.zip | |
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/acutils.h')
| -rw-r--r-- | drivers/acpi/acpica/acutils.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/acutils.h b/drivers/acpi/acpica/acutils.h index 80d8813484fe..897810ba0ccc 100644 --- a/drivers/acpi/acpica/acutils.h +++ b/drivers/acpi/acpica/acutils.h @@ -346,6 +346,21 @@ acpi_status acpi_ut_execute_sxds(struct acpi_namespace_node *device_node, u8 * highest); /* + * utlock - reader/writer locks + */ +acpi_status acpi_ut_create_rw_lock(struct acpi_rw_lock *lock); + +void acpi_ut_delete_rw_lock(struct acpi_rw_lock *lock); + +acpi_status acpi_ut_acquire_read_lock(struct acpi_rw_lock *lock); + +acpi_status acpi_ut_release_read_lock(struct acpi_rw_lock *lock); + +acpi_status acpi_ut_acquire_write_lock(struct acpi_rw_lock *lock); + +void acpi_ut_release_write_lock(struct acpi_rw_lock *lock); + +/* * utobject - internal object create/delete/cache routines */ union acpi_operand_object *acpi_ut_create_internal_object_dbg(const char |