Move the check for walk_state->thread before the dereference.
Found by smatch static checker. Compile tested.
regards,
dan carpenter
Signed-off-by: Dan Carpenter <error27@xxxxxxxxx>
--- orig/drivers/acpi/acpica/exmutex.c 2009-11-07 09:46:53.000000000 +0200
+++ devel/drivers/acpi/acpica/exmutex.c 2009-11-07 09:48:16.000000000 +0200
@@ -375,6 +375,15 @@
return_ACPI_STATUS(AE_AML_MUTEX_NOT_ACQUIRED);
}
+ /* Must have a valid thread ID */
+
+ if (!walk_state->thread) {
+ ACPI_ERROR((AE_INFO,
+ "Cannot release Mutex [%4.4s], null thread info",
+ acpi_ut_get_node_name(obj_desc->mutex.node)));
+ return_ACPI_STATUS(AE_AML_INTERNAL);
+ }
+
/*
* The Mutex is owned, but this thread must be the owner.
* Special case for Global Lock, any thread can release
@@ -392,15 +401,6 @@
return_ACPI_STATUS(AE_AML_NOT_OWNER);
}
- /* Must have a valid thread ID */
-
- if (!walk_state->thread) {
- ACPI_ERROR((AE_INFO,
- "Cannot release Mutex [%4.4s], null thread info",
- acpi_ut_get_node_name(obj_desc->mutex.node)));
- return_ACPI_STATUS(AE_AML_INTERNAL);
- }
-
/*
* The sync level of the mutex must be equal to the current sync level. In
* other words, the current level means that at least one mutex at that
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