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authorYing Xue <ying.xue@windriver.com>2015-01-16 06:13:09 +0300
committerDavid S. Miller <davem@davemloft.net>2015-01-16 09:18:51 +0300
commit57699a40b4f2694d3ee63fd5e6465ec8f600b620 (patch)
treeb3523af9d1685de66d9cba887007803bd2a1f467 /include/linux/rhashtable.h
parentcbbd36676b152719bc8f01a2b91f998820554961 (diff)
downloadlinux-57699a40b4f2694d3ee63fd5e6465ec8f600b620.tar.xz
rhashtable: Fix race in rhashtable_destroy() and use regular work_struct
When we put our declared work task in the global workqueue with schedule_delayed_work(), its delay parameter is always zero. Therefore, we should define a regular work in rhashtable structure instead of a delayed work. By the way, we add a condition to check whether resizing functions are NULL before cancelling the work, avoiding to cancel an uninitialized work. Lastly, while we wait for all work items we submitted before to run to completion with cancel_delayed_work(), ht->mutex has been taken in rhashtable_destroy(). Moreover, cancel_delayed_work() doesn't return until all work items are accomplished, and when work items are scheduled, the work's function - rht_deferred_worker() will be called. However, as rht_deferred_worker() also needs to acquire the lock, deadlock might happen at the moment as the lock is already held before. So if the cancel work function is moved out of the lock covered scope, this will avoid the deadlock. Fixes: 97defe1 ("rhashtable: Per bucket locks & deferred expansion/shrinking") Signed-off-by: Ying Xue <ying.xue@windriver.com> Cc: Thomas Graf <tgraf@suug.ch> Acked-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/rhashtable.h')
-rw-r--r--include/linux/rhashtable.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/rhashtable.h b/include/linux/rhashtable.h
index 9570832ab07c..a2562ed53ea3 100644
--- a/include/linux/rhashtable.h
+++ b/include/linux/rhashtable.h
@@ -119,7 +119,7 @@ struct rhashtable {
atomic_t nelems;
atomic_t shift;
struct rhashtable_params p;
- struct delayed_work run_work;
+ struct work_struct run_work;
struct mutex mutex;
bool being_destroyed;
};