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| 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/exconfig.c | |
| parent | aab61b676a024d3527f6201e2b31285a96f7a1d2 (diff) | |
| download | linux-8a335a2331c72e60c6b3ef09b2dedd3ba00da1b1.tar.gz linux-8a335a2331c72e60c6b3ef09b2dedd3ba00da1b1.tar.bz2 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/exconfig.c')
| -rw-r--r-- | drivers/acpi/acpica/exconfig.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/drivers/acpi/acpica/exconfig.c b/drivers/acpi/acpica/exconfig.c index 70b39c7daeab..3deb20a126b2 100644 --- a/drivers/acpi/acpica/exconfig.c +++ b/drivers/acpi/acpica/exconfig.c @@ -520,13 +520,14 @@ acpi_status acpi_ex_unload_table(union acpi_operand_object *ddb_handle) } } - /* - * Delete the entire namespace under this table Node - * (Offset contains the table_id) - */ - acpi_tb_delete_namespace_by_owner(table_index); - (void)acpi_tb_release_owner_id(table_index); + /* Delete the portion of the namespace owned by this table */ + + status = acpi_tb_delete_namespace_by_owner(table_index); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + (void)acpi_tb_release_owner_id(table_index); acpi_tb_set_table_loaded_flag(table_index, FALSE); /* Table unloaded, remove a reference to the ddb_handle object */ |