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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>
This commit is contained in:
Dana Myers 2011-01-12 09:09:31 +08:00 committed by Len Brown
parent be33b76a97
commit 5d3131f5b0
1 changed files with 9 additions and 0 deletions
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9
drivers/acpi/acpica/nsalloc.c
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@ -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;
}