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| author | Nicolas Palix <npalix@diku.dk> | 2010-08-24 17:39:00 +0200 |
|---|---|---|
| committer | Michal Marek <mmarek@suse.cz> | 2010-08-31 11:37:53 +0200 |
| commit | 54c056280e0dfcd39b33c4ed75116ce98697511c (patch) | |
| tree | d8c16d5288045ffaf8f46a9fd03d5f1659f8feeb /scripts/coccinelle/locks | |
| parent | 8aa6273106756c30e5349b58eed28d93d8d88164 (diff) | |
| download | linux-54c056280e0dfcd39b33c4ed75116ce98697511c.tar.gz linux-54c056280e0dfcd39b33c4ed75116ce98697511c.tar.bz2 linux-54c056280e0dfcd39b33c4ed75116ce98697511c.zip | |
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>
Diffstat (limited to 'scripts/coccinelle/locks')
| -rw-r--r-- | scripts/coccinelle/locks/mini_lock.cocci | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/scripts/coccinelle/locks/mini_lock.cocci b/scripts/coccinelle/locks/mini_lock.cocci new file mode 100644 index 000000000000..7641a2925434 --- /dev/null +++ b/scripts/coccinelle/locks/mini_lock.cocci @@ -0,0 +1,95 @@ +/// 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) |