AcoSail/kernel_optimize_test
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ACPI: Move dereference after NULL test

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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/):

// <smpl>
@match exists@
expression x, E;
identifier fld;
@@

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

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Julia Lawall 2009-10-17 08:34:39 +02:00 committed by Len Brown
parent 941b10fab2
commit 5cfa245b0b
1 changed files with 3 additions and 3 deletions
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6
drivers/acpi/processor_throttling.c
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@ -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.