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| author | Dana Myers <dana.myers@oracle.com> | 2011-01-12 09:09:31 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2011-01-18 23:47:41 -0500 |
| commit | 5d3131f5b0ae6303d042fd91ed9147ad4ae4bf6d (patch) | |
| tree | 1d2ebc9b9aa6b4644247cd230d16d889f7daf4a4 | |
| parent | be33b76a974cdb4ceadc1a12fb79cc97bcfeea37 (diff) | |
| download | linux-5d3131f5b0ae6303d042fd91ed9147ad4ae4bf6d.tar.gz linux-5d3131f5b0ae6303d042fd91ed9147ad4ae4bf6d.tar.bz2 linux-5d3131f5b0ae6303d042fd91ed9147ad4ae4bf6d.zip | |
ACPICA: Fix namespace race condition
Fixes a race condition between method execution and namespace
walks that can possibly fault. Problem was apparently introduced
in version 20100528 as a result of a performance optimization
that reduces the number of namespace walks upon method exit
by using the delete_namespace_subtree function instead of the
delete_namespace_by_owner function used previously. Bug is in
the delete_namespace_subtree function.
Signed-off-by: Dana Myers <dana.myers@oracle.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Reviewed-by: Rafael Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
| -rw-r--r-- | drivers/acpi/acpica/nsalloc.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nsalloc.c b/drivers/acpi/acpica/nsalloc.c index 1e5ff803d9ad..222a23e838d6 100644 --- a/drivers/acpi/acpica/nsalloc.c +++ b/drivers/acpi/acpica/nsalloc.c @@ -341,6 +341,7 @@ void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node) { struct acpi_namespace_node *child_node = NULL; u32 level = 1; + acpi_status status; ACPI_FUNCTION_TRACE(ns_delete_namespace_subtree); @@ -348,6 +349,13 @@ void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node) return_VOID; } + /* Lock namespace for possible update */ + + status = acpi_ut_acquire_mutex(ACPI_MTX_NAMESPACE); + if (ACPI_FAILURE(status)) { + return_VOID; + } + /* * Traverse the tree of objects until we bubble back up * to where we started. @@ -397,6 +405,7 @@ void acpi_ns_delete_namespace_subtree(struct acpi_namespace_node *parent_node) } } + (void)acpi_ut_release_mutex(ACPI_MTX_NAMESPACE); return_VOID; } |