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authorZach Brown <zach.brown@oracle.com>2010-07-15 12:34:33 -0700
committerAndy Grover <andy.grover@oracle.com>2010-09-08 18:16:44 -0700
commitea819867b788728aca60717e4fdacb3df771f670 (patch)
tree68952e283e4b119622c6e8244d96e41c623ae4b0 /net/rds/ib.h
parent1bde04a63d532c2540d6fdee0a661530a62b1686 (diff)
downloadop-kernel-dev-ea819867b788728aca60717e4fdacb3df771f670.zip
op-kernel-dev-ea819867b788728aca60717e4fdacb3df771f670.tar.gz
RDS/IB: protect the list of IB devices
The RDS IB device list wasn't protected by any locking. Traversal in both the get_mr and FMR flushing paths could race with additon and removal. List manipulation is done with RCU primatives and is protected by the write side of a rwsem. The list traversal in the get_mr fast path is protected by a rcu read critical section. The FMR list traversal is more problematic because it can block while traversing the list. We protect this with the read side of the rwsem. Signed-off-by: Zach Brown <zach.brown@oracle.com>
Diffstat (limited to 'net/rds/ib.h')
-rw-r--r--net/rds/ib.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/rds/ib.h b/net/rds/ib.h
index a13ced5..2189fd4 100644
--- a/net/rds/ib.h
+++ b/net/rds/ib.h
@@ -23,6 +23,7 @@
#define RDS_IB_RECYCLE_BATCH_COUNT 32
+extern struct rw_semaphore rds_ib_devices_lock;
extern struct list_head rds_ib_devices;
/*
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