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path: root/drivers/acpi/utilities/utmisc.c
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Diffstat (limited to 'drivers/acpi/utilities/utmisc.c')
-rw-r--r--drivers/acpi/utilities/utmisc.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/drivers/acpi/utilities/utmisc.c b/drivers/acpi/utilities/utmisc.c
index f0275025b71..0c5abc536c7 100644
--- a/drivers/acpi/utilities/utmisc.c
+++ b/drivers/acpi/utilities/utmisc.c
@@ -67,6 +67,14 @@ acpi_status acpi_ut_allocate_owner_id(acpi_owner_id * owner_id)
ACPI_FUNCTION_TRACE("ut_allocate_owner_id");
+ /* Guard against multiple allocations of ID to the same location */
+
+ if (*owner_id) {
+ ACPI_REPORT_ERROR(("Owner ID [%2.2X] already exists\n",
+ *owner_id));
+ return_ACPI_STATUS(AE_ALREADY_EXISTS);
+ }
+
/* Mutex for the global ID mask */
status = acpi_ut_acquire_mutex(ACPI_MTX_CACHES);
@@ -80,7 +88,8 @@ acpi_status acpi_ut_allocate_owner_id(acpi_owner_id * owner_id)
if (!(acpi_gbl_owner_id_mask & (1 << i))) {
ACPI_DEBUG_PRINT((ACPI_DB_VALUES,
"Current owner_id mask: %8.8X New ID: %2.2X\n",
- acpi_gbl_owner_id_mask, (i + 1)));
+ acpi_gbl_owner_id_mask,
+ (unsigned int)(i + 1)));
acpi_gbl_owner_id_mask |= (1 << i);
*owner_id = (acpi_owner_id) (i + 1);
@@ -143,7 +152,9 @@ void acpi_ut_release_owner_id(acpi_owner_id * owner_id_ptr)
return_VOID;
}
- owner_id--; /* Normalize to zero */
+ /* Normalize the ID to zero */
+
+ owner_id--;
/* Free the owner ID only if it is valid */