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| author | Catalin Marinas <catalin.marinas@arm.com> | 2015-06-24 16:58:31 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-24 17:49:45 -0700 |
| commit | 5f369f374ba4889fe3c17883402db5ee8d254216 (patch) | |
| tree | 984086416ed58cc61811fd4f277511b8f720ed1a /mm | |
| parent | e781a9ab4847a81224667f5faab0b2bc5f78908f (diff) | |
| download | lwn-5f369f374ba4889fe3c17883402db5ee8d254216.tar.gz lwn-5f369f374ba4889fe3c17883402db5ee8d254216.zip | |
mm: kmemleak: do not acquire scan_mutex in kmemleak_do_cleanup()
The kmemleak_do_cleanup() work thread already waits for the kmemleak_scan
thread to finish via kthread_stop(). Waiting in kthread_stop() while
scan_mutex is held may lead to deadlock if kmemleak_scan_thread() also
waits to acquire for scan_mutex.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/kmemleak.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/mm/kmemleak.c b/mm/kmemleak.c index ecde522ff616..8a57e34625fa 100644 --- a/mm/kmemleak.c +++ b/mm/kmemleak.c @@ -1762,7 +1762,6 @@ static void __kmemleak_do_cleanup(void) */ static void kmemleak_do_cleanup(struct work_struct *work) { - mutex_lock(&scan_mutex); stop_scan_thread(); /* @@ -1777,7 +1776,6 @@ static void kmemleak_do_cleanup(struct work_struct *work) else pr_info("Kmemleak disabled without freeing internal data. " "Reclaim the memory with \"echo clear > /sys/kernel/debug/kmemleak\"\n"); - mutex_unlock(&scan_mutex); } static DECLARE_WORK(cleanup_work, kmemleak_do_cleanup); |