Oct 17 2009

ACPI: Move dereference after NULL test 

Author: Julia Lawall <julia@diku.dk>

If the NULL test on pr is needed, then the dereference should be after the
NULL test.

A simplified version of the semantic match that detects this problem is as
follows (http://coccinelle.lip6.fr/):

// 
@match exists@
expression x, E;
identifier fld;
@@

* x->fld
  ... when != \(x = E\|&x\)
* x == NULL
// 

Signed-off-by: Julia Lawall 
Signed-off-by: Andrew Morton 
Signed-off-by: Len Brown 

---
 drivers/acpi/processor_throttling.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
 
diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index 4c6c14c..1c5d7a8 100644
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -1133,15 +1133,15 @@ int acpi_processor_get_throttling_info(struct acpi_processor *pr)
 	int result = 0;
 	struct acpi_processor_throttling *pthrottling;
 
+	if (!pr)
+		return -EINVAL;
+
 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 			  "pblk_address[0x%08x] duty_offset[%d] duty_width[%d]\n",
 			  pr->throttling.address,
 			  pr->throttling.duty_offset,
 			  pr->throttling.duty_width));
 
-	if (!pr)
-		return -EINVAL;
-
 	/*
 	 * Evaluate _PTC, _TSS and _TPC
 	 * They must all be present or none of them can be used.

qlambert