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| author | Zach Brown <zach.brown@oracle.com> | 2010-07-15 12:34:33 -0700 |
|---|---|---|
| committer | Andy Grover <andy.grover@oracle.com> | 2010-09-08 18:16:44 -0700 |
| commit | ea819867b788728aca60717e4fdacb3df771f670 (patch) | |
| tree | 68952e283e4b119622c6e8244d96e41c623ae4b0 /net/rds/ib.h | |
| parent | 1bde04a63d532c2540d6fdee0a661530a62b1686 (diff) | |
| download | linux-ea819867b788728aca60717e4fdacb3df771f670.tar.gz linux-ea819867b788728aca60717e4fdacb3df771f670.tar.bz2 linux-ea819867b788728aca60717e4fdacb3df771f670.zip | |
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.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/rds/ib.h b/net/rds/ib.h index a13ced504145..2189fd47a738 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; /* |