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Coccinelle: Add locks/mini_lock.cocci 

Find missing unlocks.  This semantic match considers the specific case
where the unlock is missing from an if branch, and there is a lock
before the if and an unlock after the if.  False positives are due to
cases where the if branch represents a case where the function is
supposed to exit with the lock held, or where there is some preceding
function call that releases the lock.

Signed-off-by: Nicolas Palix <npalix@diku.dk>
Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Michal Marek <mmarek@suse.cz>
This commit is contained in:
Nicolas Palix 2010-08-24 17:39:00 +02:00 committed by Michal Marek
parent 8aa6273106
commit 54c056280e
1 changed files with 95 additions and 0 deletions
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95
scripts/coccinelle/locks/mini_lock.cocci Normal file
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/// Find missing unlocks. This semantic match considers the specific case
/// where the unlock is missing from an if branch, and there is a lock
/// before the if and an unlock after the if. False positives are due to
/// cases where the if branch represents a case where the function is
/// supposed to exit with the lock held, or where there is some preceding
/// function call that releases the lock.
///
// Confidence: Moderate
// Copyright: (C) 2010 Nicolas Palix, DIKU. GPLv2.
// Copyright: (C) 2010 Julia Lawall, DIKU. GPLv2.
// Copyright: (C) 2010 Gilles Muller, INRIA/LiP6. GPLv2.
// URL: http://coccinelle.lip6.fr/
// Comments:
// Options: -no_includes -include_headers
virtual org
virtual report
@prelocked@
position p1,p;
expression E1;
@@
(
mutex_lock@p1
|
mutex_trylock@p1
|
spin_lock@p1
|
spin_trylock@p1
|
read_lock@p1
|
read_trylock@p1
|
write_lock@p1
|
write_trylock@p1
|
read_lock_irq@p1
|
write_lock_irq@p1
|
read_lock_irqsave@p1
|
write_lock_irqsave@p1
|
spin_lock_irq@p1
|
spin_lock_irqsave@p1
) (E1@p,...);
@looped@
position r;
@@
for(...;...;...) { <+... return@r ...; ...+> }
@err@
expression E1;
position prelocked.p;
position up != prelocked.p1;
position r!=looped.r;
identifier lock,unlock;
@@
lock(E1@p,...);
<+... when != E1
if (...) {
... when != E1
return@r ...;
}
...+>
unlock@up(E1,...);
@script:python depends on org@
p << prelocked.p1;
lock << err.lock;
unlock << err.unlock;
p2 << err.r;
@@
cocci.print_main(lock,p)
cocci.print_secs(unlock,p2)
@script:python depends on report@
p << prelocked.p1;
lock << err.lock;
unlock << err.unlock;
p2 << err.r;
@@
msg = "preceding lock on line %s" % (p[0].line)
coccilib.report.print_report(p2[0],msg)